Soy (2024)

FAQs

Is soy good or bad for you? ›

"Soy is an excellent source of plant-based protein and fiber. It's low in saturated fat and can provide a more economical way to eat a balanced diet," says Amy Fischer, M.S., R.D.N., C.D.N, a registered dietitian at the Good Housekeeping Institute.

If you have a history of kidney stones, avoid taking large amounts of soy. Milk allergy: Children who are very allergic to cow's milk might also be sensitive to soy products. Use soy products with caution. Bladder cancer: Soy products might increase the chance of getting bladder cancer.

Studies suggest that soy can protect against heart disease, lower the risk of breast cancer, prostate cancer, diabetes and osteoporosis as well as reduce menopause symptoms. More studies need to be done to draw firm conclusions for certain benefits, according to experts.

Not enough evidence exists to suggest a link between soy consumption and hormone changes in the body such as increased serum estrogen, breast cancer risk, thyroid hormone imbalances, and infertility.

Soy contains isoflavones, which are converted in the body to phytoestrogens, similar to human estrogen that occurs naturally in both men and women. Theoretically, a high isoflavone intake could stimulate production of estrogen and decrease production of testosterone, with one result being enlarged breast tissue.

Soy is an excellent dietary addition for patients with joint pain. It is rich in omega-3 fatty acids, meaning it may reduce inflammation within the body. Inflammatory chemicals attack the joint tissues, leading to more fluid in the joints and cartilage damage. This causes the painful symptoms patients experience.

Soy or isoflavone supplements, on the other hand, generally contain higher levels of isoflavones. Some studies have suggested a link between soy or isoflavone supplements and an increased risk of breast cancer in women who have a family or personal history of breast cancer or thyroid problems.

However, a high-level intake of soy proteins (above 25.0% weight) can induce genotoxic and cytotoxic damage to the intestine, which can be lowered by adding fermentable fibres to soy-based diets. Fermented soy products, such as tofu, contain microbes such as Streptococcus, Bifidobacteria, and Enterococcus.

Eating soy in moderation does not impact thyroid health, according to current research. Excessive soy consumption, however, may alter thyroid hormone levels and interfere with the production of thyroid hormones.

At Nutritional Weight & Wellness, we recommend that our clients are cautious in their soy intake for several reasons: Soy is difficult to digest, which can cause gas, bloating and general discomfort. Fermented soy products, such as miso, tempeh or soy sauce are more easily digested than non-fermented soy foods.

What are the pros and cons of soy milk? ›

Regularly drinking soy milk may improve your cholesterol levels, reduce high blood pressure, fight inflammation, and support weight loss or weight maintenance. A few downsides to consider are a higher cost compared with cow's milk and the added sugar content of flavored varieties.

Manufacturers favor the legume for its low cost and its isolated soy protein, which emulsifies, or blends, and binds fat and water. This keeps products moist without affecting other ingredients. The soybean's consistency allows it to be transformed into oils, flours, and meat and dairy substitutes (Van Evra, 2010).

The most common side effects of soy are digestive upsets, such as constipation and diarrhea. Soy may alter thyroid function in people who are deficient in iodine. Current evidence indicates that it's safe for women who have had breast cancer or who are at risk for breast cancer to eat soy foods.

Therefore, many people, especially women, believe that soybean-derived food can help their breasts grow bigger. This is in fact not correct. There is no evidence showing that phytoestrogen can make your breasts bigger, as the level of isoflavone found in soybeans is not high, and thus, not largely effective.

Researchers reviewed 417 reports based on human data and concluded that soy has no negative effects on thyroid health, estrogen levels, or fertility. And in some areas, scientists found soy to be beneficial.