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I have decided to take the plunge into the world of vegetarianism. I am conducting a 30 day blog about me starting this new lifestyle. I will include my challenges, research I gather, and some things I eat. Enjoy!
Friday, December 24, 2010
Day 19: Making the switch
Thursday, December 23, 2010
Day 18: More Tofu please...
Although once only found in Asian food markets, this seemingly bland food can miraculously take on the flavor of its surrounding ingredients making it a highly versatile as well as highly nutritious part of a healthy diet. Tofu can now be found in your local supermarkets throughout the year.
Discovered over 2000 years ago by the Chinese, tofu is sometimes called "the cheese of Asia," because of its physical resemblance to a block of farmer's cheese. Tofu is a highly nutritious, protein-rich food that is made from the curds of soybean milk. Off-white in color, it is usually sold in rectangular blocks. Tofu is a staple in the cuisines of many Asian countries. Tofu is its Japanese name, while in China it is known as doufu.
This chart graphically details the %DV that a serving of Tofu provides for each of the nutrients of which it is a good, very good, or excellent source according to our Food Rating System. Additional information about the amount of these nutrients provided by Tofu can be found in the Food Rating System Chart. A link that takes you to the In-Depth Nutritional Profile for Tofu, featuring information over 80 nutrients, can be found under the Food Rating System Chart.
- Health Benefits
- Description
- History
- How to Select and Store
- How to Enjoy
- Individual Concerns
- Nutritional Profile
- References
Cardiovascular Benefits of Soy Protein
Research on soy protein in recent years has shown that regular intake of soy protein can help to lower total cholesterol levels by as much as 30%, lower LDL (bad cholesterol) levels by as much as 35-40%, lower triglyceride levels, reduce the tendency of platelets to form blood clots, and possibly even raise levels of HDL (good cholesterol).
All of this sounds very good to people trying to avoid atherosclerosis or diabetic heart disease. High LDL cholesterol levels can lead to a build up of cholesterol deposits in the blood vessels. If these deposits get too large or break, they can cause a heart attack or stroke. Triglycerides are a form in which fats are transported in the blood, so high triglyceride levels, which are often seen in diabetes, can also contribute to the development and growth of these dangerous cholesterol deposits and heart disease. And blood clots can be another major problem for people with heart disease, since they can precipitate a heart attack or stroke. Soy protein, however, can address all of these issues, leading to a greatly reduced risk of heart disease.
Soy for Smooth Sailing through Menopause
Soy has also been shown to be helpful in alleviating the symptoms associated with menopause. Soy foods, like tofu, contain phytoestrogens, specifically the isoflavones, genisteinand diadzein. In a woman's body, these compounds can dock at estrogen receptors and act like very, very weak estrogens. During perimenopause, when a woman's estrogen fluctuates, rising to very high levels and then dropping below normal, soy's phytoestrogens can help her maintain balance, blocking out estrogen when levels rise excessively high, plus filling in for estrogen when levels are low. When women's production of natural estrogen drops at menopause, soy's isoflavones may provide just enough estrogenic activity to prevent or reduce uncomfortable symptoms, like hot flashes. The results of intervention trials suggest that soy isoflavones may also promote the resorption of bone and therefore inhibit postmenopausal osteoporosis.
Additionally, most types of tofu are enriched with calcium, which can help prevent the accelerated bone loss for which women are at risk during menopause. Calcium has also been found useful in rheumatoid arthritis, a condition in which calcium may help to reduce the bone loss that can occur as a result of this disease. Tofu is a good source of calcium. Four-ounces supply about 10% of the daily value for calcium and contain only 70-90 calories.
Rich in Minerals for Energy and Antioxidant Protection
Tofu is a very good source of iron, providing 33.8% of the DV for this important mineral in 4 ounces. Iron is primarily used as part of hemoglobin, a molecule essential to energy production since it is responsible for transporting and releasing oxygen throughout the body. But hemoglobin synthesis also relies on copper. Without copper, iron cannot be properly utilized in red blood cells. Fortunately, both minerals are supplied in tofu, which also contain 11.0% of the daily value for copper.
In addition to its role in hemoglobin synthesis, copper may be helpful in reducing the symptoms of rheumatoid arthritis. Copper, along with manganese (yet another trace mineral for which tofu is a very good source), is an essential cofactor of a key oxidative enzyme called superoxide dismutase. Superoxide dismutase disarms free radicals produced within the mitochondria (the energy production factories within our cells). Copper is also necessary for the activity of lysyl oxidase, an enzyme involved in cross-linking collagen and elastin, both of which provide the ground substance and flexibility in blood vessels, bones and joints. Four ounces of tofu supply 34.5% of the DV for manganese.
Want to Be "Buff"? Eat Tofu
Think a meal without meat equals a meal without protein? Think again. Four ounces of tofu provides 9.2 grams of protein, that's 18.3% of the daily value for protein, and it comes virtually free of saturated fat (less than 1 gram), and at a cost of only 86 calories.
Cardiovascular Protection from Omega-3 Fats
Fish aren't the only good source of omega-3 fatty acids. Tofu provides 14.4% of the daily value for these especially beneficial fats in just 4 ounces. Omega-3 fats have been the subject of intensive study by researchers. Omega-3 fatty acids have a broad array of health benefits. Omega-3s help prevent erratic heart rhythms, make blood less likely to clot inside arteries (which is the ultimate cause of most heart attacks), and improve the ratio of good HDL to bad LDL cholesterol. And finally, by reducing inflammation, these essential fats play a role in preventing cholesterol from clogging arteries.
Selenium-An Antioxidant, Anti-Cancer, Anti-Inflammatory Trace Mineral
Several other nutrients in tofu are helpful for other conditions. For example, tofu is a good source of selenium; 4 ounces provide 14.4% of the daily value for this trace mineral. Selenium is needed for the proper function of the antioxidant system, which works to reduce the levels of damaging free radicals in the body. Selenium is a necessary cofactor of one of the body's most important internally produced antioxidants, glutathione peroxidase, and also works with vitamin E in numerous vital antioxidant systems throughout the body. These powerful antioxidant actions make selenium helpful not only against colon cancer by protecting colon cells from cancer-causing toxins, but in decreasing asthma and arthritis symptoms and in the prevention of heart disease. In addition, selenium is involved in DNA repair, yet another way in which adequate intake of this mineral is associated with a reduced risk for cancer.
Tofu is a highly nutritious, protein-rich, delicious food that is made from the curds of soybean milk. Off-white in color, it is usually sold in rectangular blocks. Tofu is a staple in the cuisines of many Asian countries. Tofu is its Japanese name, while in China it is known as doufu.
Tofu is one of the most versatile foods, serving a host of different purposes ranging from salad dressing to dessert to entrée and more. Some of its versatility is owed to its neutral taste, which gives tofu the ability to absorb the flavors of surrounding ingredients. Additionally, tofu comes in a range of consistencies that can suit a variety of different recipes. Tofu is available in either the traditional Chinese form or the silken Japanese form, with the latter having a smoother, custard-like texture. Both forms can be found in soft, firm or extra-firm textures.
The scientific name for soybean, from which tofu is made, isGlycine max.
Tofu originated in China about 2000 yearsw ago. While the details of its discovery are uncertain, legend has it that it was discovered by accident when a Chinese cook added the seaweed nigari to a pot of soybean milk, causing it to curdle; the result was tofu.
Tofu was introduced into Japan in the 8th century, where it was originally known as "okabe," but was not called "tofu" until the 15th century. While serving as a traditionally made dish, tofu did not gain its great widespread popularity in Japan until the 17th century.
Tofu's popularity in the West has mirrored the increasing interest in healthier foods. First gaining more widespread attention during the 1960s, tofu has been skyrocketing in popularity ever since research has begun to reveal the many significant benefits this nutrient-rich, plant-based food can provide.
Tofu is available refrigerated in individual packages or in bulk, or non-refrigerated in aseptically sealed containers. Packaged tofu should feature expiration dates, which you can use as a guideline for how long of a shelflife it will have.. Tofu varies in texture from soft to firm to extra-firm. Soft tofu has a smoother texture and is therefore better suited for salad dressings, sauces and desserts, while firm and extra-firm tofu are best for baking, stir-frying and grilling.
While aseptically packaged tofu need not be refrigerated until it is opened, all other forms of tofu should be refrigerated in their container. Once their packages are open, all types should be rinsed well, kept in a container covered with water, and placed in the refrigerator. Changing the water daily will help keep the tofu fresh for up to one week.
Tofu can also be frozen in its original packaging and will keep this way for up to five months. This process will actually alter its texture and color, making it more spongy and absorbent, and more yellowish in color. This change in physical properties is actually very suitable for certain recipe preparations.
If you are selecting tofu on the basis of fat content, the firmer tofus are usually the highest in fat, and the softest tofus, often called silky or silken, are the lowest.
If you are looking for tofu with a high calcium content, look for products that specifically say "calcium-precipitated" on the label or that include calcium sulfate in their ingredient list. This method of tofu manufacturing uses calcium to help coagulate the soy milk.
For some of our favorite recipes, click Recipes.
A Few Quick Serving Ideas:
Blend together soft tofu, olive oil, garlic and lemon juice to make a tofu aoli dip.
Scramble soft tofu together with your favorite vegetables and the spice turmeric to give it a yellow "egg-like" coloring. This delicious dish can be served as is or can be used as the basis for "tofu rancheros" by being wrapped in a tortilla and served with black beans and salsa.
Healthy Stir-Fry firm tofu with your favorite vegetables and seasonings.
Blend soft tofu with your favorite fruits (and honey or other natural sweeteners to taste) in a blender or food processor and serve for breakfast or dessert.
Add cubes of tofu to miso soup.
Allergic Reactions to Tofu
Although allergic reactions can occur to virtually any food, research studies on food allergy consistently report more problems with some foods than with others. It's important to realize that the frequency of problems varies from country to country and can change significantly along with changes in the food supply or with other manufacturing practices. For example, in several part of the world, including Canada, Japan, and Israel, sesame seed allergy has risen to a level of major concern over the past 10 years.
In the United States, beginning in 2004 with the passage of the Food Allergen Labeling and Consumer Protection Act (FALCPA), food labels have been required to identify the presence of any major food allergens. Since 90% of food allergies in the U.S. have been associated with 8 food types as reported by the U.S. Centers for Disease Control, it is these 8 food types that are considered to be major food allergens in the U.S. and require identification on food labels. The 8 food types classified as major allergens are as follows: (1) wheat, (2) cow's milk, (3) hen's eggs, (4) fish, (5) crustacean shellfish (including shrimp, prawns, lobster and crab); (6) tree nuts (including cashews, almonds, walnuts, pecans, pistachios, Brazil nuts, hazelnuts and chestnuts); (7) peanuts; and (8) soy foods.
These foods do not need to be eaten in their pure, isolated form in order to trigger an adverse reaction. For example, yogurt made from cow's milk is also a common allergenic food, even though the cow's milk has been processed and fermented in order to make the yogurt. Ice cream made from cow's milk would be an equally good example.
Food allergy symptoms may sometimes be immediate and specific, and can include skin rash, hives, itching, and eczema; swelling of the lips, tongue, or throat; tingling in the mouth; wheezing or nasal congestion; trouble breathing; and dizziness or lightheadedness. But food allergy symptoms may also be much more general and delayed, and can include fatigue, depression, chronic headache, chronic bowel problems (such as diarrhea or constipation), and insomnia. Because most food allergy symptoms can be caused by a variety of other health problems, it is good practice to seek the help of a healthcare provider when evaluating the role of food allergies in your health.
Tofu and Oxalates
Soybeans, and foods made from them like tofu, are among a small number of foods that contain measurable amounts of oxalates, naturally-occurring substances found in plants, animals, and human beings. When oxalates become too concentrated in body fluids, they can crystallize and cause health problems. For this reason, individuals with already existing and untreated kidney or gallbladder problems may want to avoid eating soybean-based products like tofu. Laboratory studies have shown that oxalates may also interfere with absorption of calcium from the body. Yet, in every peer-reviewed research study we've seen, the ability of oxalates to lower calcium absorption is relatively small and definitely does not outweigh the ability of oxalate-containing foods to contribute calcium to the meal plan. If your digestive tract is healthy, and you do a good job of chewing and relaxing while you enjoy your meals, you will get significant benefits - including absorption of calcium - from calcium-rich foods plant foods that also contain oxalic acid. Ordinarily, a healthcare practitioner would not discourage a person focused on ensuring that they are meeting their calcium requirements from eating these nutrient-rich foods because of their oxalate content. For more on this subject, please see "Can you tell me what oxalates are and in which foods they can be found?"
Soybean-based Foods and Genetically Modified Organisms (GMOs)
A large percentage of the conventionally grown soybeans in the United States come from genetically modified (GM) seeds. If you are looking your exposure to GM foods, choose organically grown soybeans (and foods such as tofu, tempeh and miso made from it), since the current USDA organic regulations prohibit the use of GM seeds for growing foods to be labeled as organically grown. A wide assortment of processed food contain soy-based ingredients (such as soy protein and hydrolyzed vegetable protein); look for the organic version of these items in your foods and/or look for foods that note that they do not contain any genetically modified ingredients (sometimes this is noted on the packaged as "GMO-free"). For more on this subject, see thisQ+A.
Tofu is a very good source of manganesem, iron and protein. In addition, tofu is a good source of selenium, omega-3 fatty acids, phosphorus, copper, calcium and magnesium.
For an in-depth nutritional profile click here: Tofu.
In-Depth Nutritional Profile
In addition to the nutrients highlighted in our ratings chart, an in-depth nutritional profile for Tofu is also available. This profile includes information on a full array of nutrients, including carbohydrates, sugar, soluble and insoluble fiber, sodium, vitamins, minerals, fatty acids, amino acids and more.Introduction to Food Rating System Chart
In order to better help you identify foods that feature a high concentration of nutrients for the calories they contain, we created a Food Rating System. This system allows us to highlight the foods that are especially rich in particular nutrients. The following chart shows the nutrients for which this food is either an excellent, very good, or good source (below the chart you will find a table that explains these qualifications). If a nutrient is not listed in the chart, it does not necessarily mean that the food doesn't contain it. It simply means that the nutrient is not provided in a sufficient amount or concentration to meet our rating criteria. (To view this food's in-depth nutritional profile that includes values for dozens of nutrients - not just the ones rated as excellent, very good, or good - please use the link below the chart.) To read this chart accurately, you'll need to glance up in the top left corner where you will find the name of the food and the serving size we used to calculate the food's nutrient composition. This serving size will tell you how much of the food you need to eat to obtain the amount of nutrients found in the chart. Now, returning to the chart itself, you can look next to the nutrient name in order to find the nutrient amount it offers, the percent Daily Value (DV%) that this amount represents, the nutrient density that we calculated for this food and nutrient, and the rating we established in our rating system. For most of our nutrient ratings, we adopted the government standards for food labeling that are found in the U.S. Food and Drug Administration's "Reference Values for Nutrition Labeling." Read more background information and details of our rating system.
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In-Depth Nutritional Profile for Tofu
- Ensminger AH, Esminger M. K. J. e. al. Food for Health: A Nutrition Encyclopedia. Clovis, California: Pegus Press; 1986 1986. PMID:15210.
- Fortin, Francois, Editorial Director. The Visual Foods Encyclopedia. Macmillan, New York 1996.
- Kritz-Silverstein D, Goodman-Gruen DL. Usual dietary isoflavone intake, bone mineral density, and bone metabolism in postmenopausal women. J Womens Health Gend Based Med 2002 Jan-Feb;11(1):69-78 2002.
- Wood, Rebecca. The Whole Foods Encyclopedia. New York, NY: Prentice-Hall Press; 1988 1988. PMID:15220.
- Yamori Y, Moriguchi EH, Teramoto T et al. Soybean isoflavones reduce postmenopausal bone resorption in female Japanese immigrants in Brazil: a ten-week study. J Am Coll Nutr 2002 Dec;21(6):560-3 2002.
More of the World's Healthiest Foods (& Spices)!
Wednesday, December 22, 2010
Day 17: Black bean soup
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Tuesday, December 21, 2010
Day 16: Hummus
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Day 16: Books and such
Reading this book now. Very good material.
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Monday, December 20, 2010
Day 15: Flax Seed
The warm, earthy and subtly nutty flavor of flaxseeds combined with an abundance of omega-3 fatty acids makes them an increasingly popular addition to the diets of many a health conscious consumer. Whole and ground flaxseeds, as well as flaxseed oil, are available throughout the year.
Flaxseeds are slightly larger than sesame seeds and have a hard shell that is smooth and shiny. Their color ranges from deep amber to reddish brown depending upon whether the flax is of the golden or brown variety. While whole flaxseeds feature a soft crunch, the nutrients in ground seeds are more easily absorbed.
This chart graphically details the %DV that a serving of Flaxseeds provides for each of the nutrients of which it is a good, very good, or excellent source according to our Food Rating System. Additional information about the amount of these nutrients provided by Flaxseeds can be found in the Food Rating System Chart. A link that takes you to the In-Depth Nutritional Profile for Flaxseeds, featuring information over 80 nutrients, can be found under the Food Rating System Chart.
- Health Benefits
- Description
- History
- How to Select and Store
- How to Enjoy
- Individual Concerns
- Nutritional Profile
- References
Flaxseeds are rich in alpha linolenic acid (ALA), an omega-3 fat that is a precursor to the form of omega-3 found in fish oils called eicosapentaenoic acid or EPA. Since the fats are found in their isolated form in flaxseed oil, it is a more concentrated source of ALA than the seeds themselves (although it doesn't have the other nutrients that the seeds do). ALA, in addition to providing several beneficial effects of its own, can be converted in the body to EPA, thus providing EPA's beneficial effects. For this conversion to readily take place, however, depends on the presence and activity of an enzyme called delta-6-destaurase, which, in some individuals, is less available or less active than in others. In addition, delta-6-desaturase function is inhibited in diabetes and by the consumption of saturated fat and alcohol. For these reasons, higher amounts of ALA-rich flaxseeds or its oil must be consumed to provide the same benefits as the omega-3 fats found in the oil of cold-water fish.
A recent MedLine check (MedLine provides access to the published peer-reviewed medical literature) revealed 1,677 research articles on linolenic acid, investigating its effects on numerous physiological processes and health conditions.
Anti-Inflammatory Benefits
Omega-3 fats are used by the body to produce Series 1 and 3 prostaglandins, which are anti-inflammatory hormone-like molecules, in contrast to the Series 2 prostaglandins, which are pro-inflammatory molecules produced from other fats, notably the omega-6 fats, which are found in high amounts in animal fats, margarine, and many vegetable oils including corn, safflower, sunflower, palm, and peanut oils. Omega-3 fats can help reduce the inflammation that is a significant factor in conditions such as asthma, osteoarthritis, rheumatoid arthritis, migraine headaches, and osteoporosis.
Omega-3-rich Flaxseeds Protect Bone Health
Alpha linolenic acid, the omega-3 fat found in flaxseed and walnuts, promotes bone health by helping to prevent excessive bone turnover-when consumption of foods rich in this omega-3 fat results in a lower ratio of omega-6 to omega-3 fats in the diet.(Griel AE, Kris-Etherton PM, et al. Nutrition Journal)
Other studies have shown that diets rich in the omega-3s from fish (DHA and EPA), which also naturally result in a lowered ratio of omega-6 to omega-3 fats, reduce bone loss. Researchers think this is most likely because omega-6 fats are converted into pro-inflammatory prostaglandins, while omega-3 fats are metabolized into anti-inflammatory prostaglandins. (Prostaglandins are hormone-like substances made in our bodies from fatty acids.)
In this study, 23 participants ate each of 3 diets for a 6-week period with a 3 week washout period in between diets. All 3 diets provided a similar amount of fat, but their ratio of omega-6 to omega-3 fats was quite different:
Diet 1 provided 34% total fat with omega-6 and omega-3 fats in amounts typically seen in the American diet: 9% polyunsaturated fats (PUFAs) of which 7.7% were omega-6 and only 0.8% omega-3 fats, resulting in a pro-inflammatory ratio of 9.6:1.
Diet 2, an omega-6-rich diet, provided 37% total fat containing 16% PUFAs of which 12% were omega-6 and 3.6% omega-3, a better but still pro-inflammatory ratio of 3.3:1.
Diet 3, which provided 38% in total fats, was an omega-3-rich diet, containing 17% PUFAs, of which 10.5% were omega-6 and 6.5% omega-3, resulting in an anti-inflammatory ratio of 1.6:1.
After each diet, subjects' blood levels of N-telopeptides, a marker of bone breakdown, were measured, and were found to be much lower following Diet 3, the omega-3-rich diet, than either of the other two.
The level of N-telopeptides seen in subjects' blood each diet also correlated with that of a marker of inflammation called tumor necrosis factor-alpha (TNF-alpha). Diets 1 and 2-the diets which had a significantly higher ratio of omega-6 to omega-3 fats-also had much higher levels of TNF-alpha than the Diet 3, which was high in omega-3 fats from walnuts and flaxseed. Practical Tip: Protect your bones' by making anti-inflammatory omega-3-rich flaxseed and walnuts, as well as cold water fish, frequent contributors to your healthy way of eating.
Protection Against Heart Disease, Cancer and Diabetes
Omega-3 fats are used to produce substances that reduce the formation of blood clots, which can reduce the risk of heart attack and stroke in patients with atherosclerosis or diabetic heart disease.
Omega-3 fats are also needed to produce flexible cell membranes. Cell membranes are the cell's gatekeepers, allowing in needed nutrients while promoting the elimination of wastes. While important for everyone, flexible cell membranes are critical for persons with diabetes since flexible cell membranes are much better able to respond to insulin and to absorb glucose than the stiff membranes that result when the diet is high in saturated and/or hydrogenated (trans-) fats. In the colon, omega-3 fats help protect colon cells from cancer-causing toxins and free radicals, leading to a reduced risk for colon cancer.
Flaxseeds Help Prevent and Control High Blood Pressure
Individuals whose diets provide greater amounts of omega-3 fatty polyunsaturated fatty acids-and flaxseed is an excellent source of these essential fats-have lower blood pressure than those who consume less, shows data gathered in the International Study of Macro- and Micro-nutrients and Blood Pressure (INTERMAP) study (Ueshima H, Stamler J, et al. Hypertension).
The INTERMAP is a study of lifestyle factors, including diet, and their effect on blood pressure in 4,680 men and women aged 40 to 59 living in Japan, China, the U.S. and the U.K. Blood pressure was measured and dietary recall questionnaires were completed by participants on four occasions. Dietary data was analyzed for levels of omega-3 fatty acids from food sources including fish, nuts, seeds and vegetable oils.
Average daily intake of omega-3 fatty acids was 2 grams. Participants with a high (o.67% kcal) omega-3 fatty acid percentage of their daily calorie intake had an average systolic and diastolic blood pressure reading that was 0.55/0.57 mm Hg less, respectively, than participants with lower intake. Previous research has found that a decrease of 2 mm Hg reduces the population-wide average stroke mortality rate by 6 percent and that of coronary heart disease by 4%.
Higher omega-3 fatty acid intake among the 2,238 subjects who were not using drugs, supplements, or a special diet for hypertension, heart disease, or diabetes was associated with a 1.01/0.98 mm Hg reduction in systolic and diastolic blood pressure, respectively.
For the 2,038 subjects in this group who did not have hypertension, greater intake was associated with a 0.91/0.92 mm Hg average systolic and diastolic reduction.
Lead author Hirotsugu Ueshima, MD of Shiga University of Medical Science in Japan, noted that the beneficial effect of omega-3 fats was even greater in people who had not yet developed high blood pressure.
The researchers also found that omega-3s from nuts, seeds, and vegetable oils-such as walnuts and flaxseed-had just as much impact on blood pressure as omega-3s from fish. "With blood pressure, every millimeter counts. The effect of each nutrient is apparently small but independent, so together they can add up to a substantial impact on blood pressure. If you can reduce blood pressure a few millimeters from eating less salt, losing a few pounds, avoiding heavy drinking, eating more vegetables, whole grains and fruits (for their fiber, minerals, vegetable protein and other nutrients) and getting more omega-3 fatty acids, then you've made a big difference," said Ueshima.
Flaxseed Provides Comparable Cholesterol-Lowering Benefits to Statin Drugs
In a study involving 40 patients with high cholesterol (greater than 240 mg/dL), daily consumption of 20 grams of ground flaxseed was compared to taking a statin drug. After 60 days, significant reductions were seen in total cholesterol, LDL cholesterol, triglycerides and the ratio of total to HDL cholesterol-in both groups. Those receiving flaxseed did just as well as those given statin drugs!
Body mass index, total cholesterol, HDL-cholesterol, LDL-cholesterol, triglycerides, and the ratio of total cholesterol/HDL-cholesterol were measured at the beginning of the study and after 60 days.
In those eating flaxseed, significant reductions were seen in total cholesterol (-17.2%), LDL-cholesterol (-3.9%), triglycerides (-36.3%) and the ratio of total cholesterol/HDL-cholesterol (-33.5%) were observed in the diet+flax group, compared to baseline. Similar reductions were seen in those taking the statin. Benefits did not significantly differ between the two groups.
Flaxseed Oil Lowers Blood Pressure in Men with High Cholesterol
Greek researchers looked at the effect on systolic and diastolic blood pressure of a three-month trial during which 59 middle-aged men used either flaxseed or safflower oil in their daily diet.
Flaxseed oil is rich in the omega-3 fat, alpha-linolenic acid (ALA), which the body can metabolize into the cardioprotective long-chain omega-3 fatty acids, DHA and EPA, while safflower oil is a concentrated source of the omega-6 fat, linoleic acid (LA). The men received flaxseed oil supplying 8 grams of ALA daily or safflower oil providing 11 grams of LA per day.
At the conclusion of the 12-week study, both systolic and diastolic blood pressure was significantly lower in the men using the omega-3-rich flaxseed oil.
One possible explanation for this result is the anti-inflammatory effects of omega-3 fats. Both omega-6 and omega-3 fats areessential fatty acids: we need both types of fats to be healthy and must derive them from our food. Omega-6 fats, however, tend to promote excessive inflammation when not balanced by sufficient amounts of omega-3 fats in the diet.
Most nutrition experts believe that a health-promoting ratio of omega-6 to omega-3 fats is no higher than 4:1, and many believe the optimal ratio is 2:1. The typical American diet, however, delivers almost 10 times as much omega-6 as omega-3 fatty acids. Practical Tip: Numerous studies have shown heart-protective benefits from decreasing the ratio of omega-6 to omega-3 fats in the diet. To improve your omega 6:omega to omega-3 ratio increase your consumption of foods rich in omega-3s, such as flaxseed oil, canola oil, walnuts, and cold-water fish like wild salmon. And decrease your consumption of foods rich in omega-6 fats, such as safflower oil, corn oil, peanut oil, butter and the fats found in meats.
Rich in Beneficial Fiber
Flaxseeds' omega-3 fats are far from all this exceptional food has to offer. Flaxseed meal and flour provides a very good source of fiber that can lower cholesterol levels in people with atherosclerosis and diabetic heart disease, reduce the exposure of colon cells to cancer-causing chemicals, help relieve constipation and stabilize blood sugar levels in diabetic patients. Flaxseeds are also a good source of magnesium, which helps to reduce the severity of asthma by keeping airways relaxed and open, lowers high blood pressure and reduces the risk of heart attack and stroke in people with atherosclerosis and diabetic heart disease, prevents the blood vessel spasm that leads to migraine attacks, and generally promotes relaxation and restores normal sleep patterns.
Flaxseed Puts the Brakes on Prostate Cancer Growth
Flaxseed, a rich source of omega-3 fatty acids and lignans, put the brakes on prostate tumor growth in men who were given 30 grams of flaxseed daily for a month before surgery to treat their prostate cancer. The 40 men taking flaxseed, either alone or along with a low-fat diet, were compared to 40 men only following a low-fat diet, and 40 men in a control group who did not alter or supplement their usual diet. Men who took flaxseed, as well as those who took flaxseed combined with a low-fat diet did the best.
Lead author, Duke University researcher Wendy Demark-Wahnefried, believes the omega-3s in flaxseed alter how cancer cells lump together or cling to other cells, while flaxseed's anti-angiogenic lignans choke off the tumor's blood supply, thus helping to halt the cellular activity that leads to cancer growth.Journal of Clinical Oncology, 2007 ASCO Annual Meeting, Abstract 1510.
Practical Tip: Study participants took the flaxseed in a ground form to make it more digestible, and mixed it in drinks or sprinkled it on food such as yogurt, cereal or salads.
Special Protection for Women's Health
Flaxseed meal and flour have been studied quite a bit lately for their beneficial protective effects on women's health. Flaxseed is particularly rich in lignans, special compounds also found in other seeds, grains, and legumes that are converted by beneficial gut flora into two hormone-like substances calledenterolactone and enterodiol. These hormone-like agents demonstrate a number of protective effects against breast cancer and are believed to be one reason a vegetarian diet is associated with a lower risk for breast cancer. Studies show that women with breast cancer and women who are omnivores typically excrete much lower levels of lignans in their urine than vegetarian women without breast cancer. In animal studies conducted to evaluate lignans' beneficial effect, supplementing a high-fat diet with flaxseed flour reduced early markers for mammary (breast) cancer in laboratory animals by more than 55%.
In a study published in the American Journal of Clinical Nutrition, when postmenopausal women ate a daily muffin containing either 25 grams (a little less than 1 ounce) of soy protein, 25 grams of ground flaxseed, or a placebo muffin containing neither for 16 weeks, the estrogen metabolism of those eating flaxseed, but not soy or placebo, was altered in several important protective ways:
- Levels of 2-hydroxyestrone, a less biologically active estrogen metabolite thought to be protective against breast cancer, increased significantly.
- The ratio of 2-hydroxyestrone (the protective estrogen metabolite) to 16alpha-hydroxyestrone (an estrogen metabolite thought to promote cancer) increased.
- Blood levels of the estrogen fractions (estradiol, estrone, and estrone sulfate) did not change significantly-which is important since estradiol is involved in maintaining bone mass.
In addition to lessening a woman's risk of developing cancer, the lignans abundant in flaxseed can promote normal ovulation and extend the second, progesterone-dominant half of the cycle. The benefits of these effects are manifold. For women trying to become pregnant, consistent ovulation significantly improves their chances of conception. For women between the ages of 35 and 55 who are experiencing peri-menopausal symptoms such as irregular menstrual cycles, breast cysts, headaches, sleep difficulties, fluid retention, anxiety, irritability, mood swings, weight gain, lowered sex drive, brain fog, fibroid tumors, and heavy bleeding, a probable cause of all these problems is estrogen dominance. Typically, during the 10 years preceding the cessation of periods at midlife, estrogen levels fluctuate while progesterone levels steadily decline. Flaxseed, by promoting normal ovulation and lengthening the second half of the menstrual cycle, in which progesterone is the dominant hormone, helps restore hormonal balance.
Preliminary research also suggests that flaxseeds may serve a role in protecting post-menopausal woman from cardiovascular disease. In a recent double-blind randomized study, flaxseeds reduced total cholesterol levels in the blood of postmenopausal women who were not on hormone replacement therapy by an average of 6%.
Lastly, lignan-rich fiber has also been shown to decrease insulin resistance, which, in turn, reduces bio-available estrogen, which also lessens breast cancer risk. And, as insulin resistance is an early warning sign for type 2 diabetes, flaxseed may also provide protection against this disease.
Flaxseed Reduces Hot Flashes Almost 60%
Researchers recruited 29 postmenopausal women who had suffered from at least 14 hot flushes each week for at least one month, but would not take estrogen because of a perceived increased risk of breast cancer. After taking 40 grams (1.4 ounces) of crushed flaxseed each day for six weeks, the frequency of hot flashes decreased 50%, and the overall hot flash score decreased an average 57% for the 21 women who completed the trial. J Soc Integr Oncol. 2007 Summer;5(3):106-12.Fend Off Dry Eyes
Dry eye syndrome (DES) afflicts more than 10 million Americans. Artificial tears offer only temporary relief. Expensive prescription drugs promise help, but at the cost of potentially serious side effects.
Could Mother Nature provide a cure? Yes, suggests research published in the American Journal of Clinical Nutrition involving nearly 40,000 female health professionals aged 45-84 enrolled in the Women's Health Study.
Researcher Biljana Miljanovic, MD, MPH, and colleagues at Brigham and Women's Hospital looked at whether essential fatty acids-the omega-3 fats (found in high amounts in cold water fish and flaxseeds), and the omega-6 fats (found in red meat, safflower, sunflower, soy and corn oils)-play a role.
They do. Women whose diets provided the highest amounts of omega-3 fatty acids had a 17% lower risk of dry eye syndrome compared with those consuming the least of these beneficial fats.
In contrast, a diet high in omega-6 fats, but low in omega-3s, significantly increased DES risk. Women whose diets supplied a high ratio of omega-6 to omega-3 fatty acids had a 2.5-fold higher risk of DES syndrome compared to those with a more balanced intake of fatty acids.
Researchers specifically looked at eating tuna fish-a main source of omega-3 fatty acids in the American diet.
Compared with women eating less than one 4-ounce serving of tuna a week:
- Women who ate 2 to 4 servings of tuna per week had a 19% lower risk of DES.
- Women eating 5 to 6 servings of tuna per week had a 68% lower risk of DES.
"These findings suggest that increasing dietary intake of omega-3 fatty acids may reduce the risk of dry eye syndrome, an important and prevalent cause of ocular complaints," Miljanovic and colleagues conclude. In addition to tuna fish, omega-3 fatty acids are richly supplied by other fatty fish (such as salmon, mackerel, halibut, sardines, and herring), flaxseeds and flaxseed oil. Due to concerns about mercury levels in tuna, to lower your risk of DES we recommend enjoying a variety of cold-water fish and adding flaxseeds and flaxseed oil to your Healthiest Way of Eating.
What's in a name? Well, when it comes to the scientific name of flaxseeds, the name says it all. Flaxseeds are known as Linum usitatissimum with it species name meaning "most useful." That would definitely describe the versatility and nutritional value of this tiny little seed.
Flaxseeds are slightly larger than sesame seeds and have a hard shell that is smooth and shiny. Their color ranges from deep amber to reddish brown depending upon whether the flax is of the golden or brown variety.
Their flavor is warm and earthy with a subtly nutty edge. While unground flaxseeds feature a soft crunch, they are usually not consumed whole but rather ground since this allows for the enhancement of their nutrient absorption. Ground flaxseeds can have a relatively mealy texture with a potential hint of crunch depending upon how fine they are ground.
Flaxseeds have a long and extensive history. Originating in Mesopotamia, the flax plant has been known since the Stone Ages. One of the first records of the culinary use of flaxseeds is from times of ancient Greece. In both that civilization and in ancient Rome, the health benefits of flaxseeds were widely praised. After the fall of Rome, the cultivation and popularity of flaxseeds declined.
Ironically, it was Charlemagne, the emperor who would be famous for shaping European history, who also helped to shape the history of flaxseeds, restoring them to their noble position in the food culture of Europe. Charlemagne was impressed with how useful flax was in terms of its culinary, medicinal, and fiber usefulness (flaxseed fibers can be woven into linen) that he passed laws requiring not only its cultivation but its consumption as well. After Charlemange, flaxseeds became widely appreciated throughout Europe.
It was not until the early colonists arrived in North America that flax was first planted in the United States. In the 17th century, flax was first introduced and planted in Canada, the country that is currently the major producer of this extremely beneficial seed.
Flaxseeds can be purchased either whole or already ground. The two different forms offer distinct benefits. Although ground flaxseeds may be more convenient, whole flaxseeds feature a longer shelf life.
Whole flaxseeds are generally available in prepackaged containers as well as bulk bins. Just as with any other food that you may purchase in the bulk section, make sure that the bins containing the flaxseeds are covered and that the store has a good product turnover so as to ensure their maximal freshness. Whether purchasing flaxseeds in bulk or in a packaged container, make sure that there is no evidence of moisture. If you purchase whole flaxseeds, store them in an airtight container in a dark, dry and cool place where they will keep fresh for several months.
Ground flaxseeds are usually available both refrigerated and non-refrigerated. It is highly recommended to purchase ground flaxseed that is in a vacuum-sealed package or has been refrigerated since once flaxseeds are ground, they are much more prone to oxidation and spoilage. Likewise, if you either purchase ground flaxseeds or you grind them at home, it is important to keep them in a tightly sealed container in the refrigerator or freezer to prevent them from becoming rancid.
Flaxseed oil is especially perishable and should be purchased in opaque bottles that have been kept refrigerated. Flaxseed oil should have a sweet nutty flavor. Never use flaxseed oil in cooking; add it to foods after they have been heated.
For some of our favorite recipes, click Recipes.
Tips for Preparing Flaxseeds:
Grind flaxseeds in a coffee or seed grinder in order to enhance their digestibility and therefore their nutritional value. If adding ground flaxseeds to a cooked cereal or grain dish, do so at the end of cooking since the soluble fiber in the flaxseeds can thicken liquids if left too long.
A Few Quick Serving Ideas:
Sprinkle ground flaxseeds onto your hot or cold cereal.
Add flaxseeds to your homemade muffin, cookie or bread recipe.
To pump up the nutritional volume of your breakfast shake, add ground flaxseeds.
To give cooked vegetables a nuttier flavor, sprinkle some ground flaxseeds on top of them.
Add a tablespoon of flaxseed oil to smoothies.
While flaxseeds contain cyanogenic glycosides compounds, at normal levels and without protein malnutrition, researchers currently maintain that this is not of concern and should cause no adverse effects (they consider 50 grams, which is more than 2 TBS, to be a safe amount for most people). The heat employed by cooking has been found to eliminate the presence of these compounds.
Some people have gastrointestinal symptoms, such as flatulence and bloating, when they first begin to incorporate flaxseeds into their diet. It is suggested to start with a small amount, such as one teaspoon, and slowly build yourself up to your intake goal. When increasing fiber intake in the diet, it is also a good idea to include fluid (water) intake as well.
Several animal studies (involving rats and mice) have raised questions about the safety of high-dose flaxseeds during pregnancy - not for the pregnant females, but for their offspring. "High-dose" in these animal experiments has meant flax intake as 10% of the total diet, or about 4 tablespoons of flaxseed for every 2,000 calories. Although it is impossible to generalize from animal studies to humans, we recommend that women who are pregnant (or considering pregnancy) consult with their healthcare providers if they are consuming or planning to consume flaxseeds in these high amounts.
Flaxseeds are an excellent source of omega-3 essential fatty acids. They are a very good source of dietary fiber and manganese. They are also a good source of folate and vitamin B6 as well as the minerals magnesium, phosphorus, and copper. In addition, flax seeds are concentrated in lignan phytonutrients.
For an in-depth nutritional profile click here: Flax seeds.
In-Depth Nutritional Profile
In addition to the nutrients highlighted in our ratings chart, an in-depth nutritional profile for Flaxseeds is also available. This profile includes information on a full array of nutrients, including carbohydrates, sugar, soluble and insoluble fiber, sodium, vitamins, minerals, fatty acids, amino acids and more.Introduction to Food Rating System Chart
In order to better help you identify foods that feature a high concentration of nutrients for the calories they contain, we created a Food Rating System. This system allows us to highlight the foods that are especially rich in particular nutrients. The following chart shows the nutrients for which this food is either an excellent, very good, or good source (below the chart you will find a table that explains these qualifications). If a nutrient is not listed in the chart, it does not necessarily mean that the food doesn't contain it. It simply means that the nutrient is not provided in a sufficient amount or concentration to meet our rating criteria. (To view this food's in-depth nutritional profile that includes values for dozens of nutrients - not just the ones rated as excellent, very good, or good - please use the link below the chart.) To read this chart accurately, you'll need to glance up in the top left corner where you will find the name of the food and the serving size we used to calculate the food's nutrient composition. This serving size will tell you how much of the food you need to eat to obtain the amount of nutrients found in the chart. Now, returning to the chart itself, you can look next to the nutrient name in order to find the nutrient amount it offers, the percent Daily Value (DV%) that this amount represents, the nutrient density that we calculated for this food and nutrient, and the rating we established in our rating system. For most of our nutrient ratings, we adopted the government standards for food labeling that are found in the U.S. Food and Drug Administration's "Reference Values for Nutrition Labeling." Read more background information and details of our rating system.
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In-Depth Nutritional Profile for Flaxseeds