Soy Foods, Healthy Foods

Soy foods are considered as healthy foods because soybeans are nutritious. Dry whole soybeans contain (by weight) 40% protein with a significant amount of complete essential amino acids, 35% carbohydrate mostly dietary fiber, 20% oil including omega-3 fatty acids and about 5% ash with B vitamins, molybdenum, manganese, iron, phosphorus, magnesium, copper, and potassium.

Soy foods are varied from vegetables like edamamé and soy sprouts, flavor enhancer like hydrogenated vegetable protein, miso and soy sauces, dairy products like milk, yoghurt, cheese, and ice cream, to flour substitutes that enable wide variety of healthy foods.

The complete protein profile makes soybean the best meat alternative with less cholesterol and saturated fat content. A wide variety of vegetarian foods, including meat imitator, are soy foods made from textured vegetable protein. Isolated soy protein is used in healthy foods as highly digestible source of amino acids.

Most carbohydrates in soy foods are dietary fiber. Some processed foods are made healthy with soy fiber like okara, soy bran, and soy isolate fiber.

Soy oil is the most widely used oil in the U.S. It is cholesterol-free, high in polyunsaturated fat and also made into margarine, shortening and whipped toppings.

Fermentation process in soy foods such as tempeh, natto, miso and soy sauce may lowers the high phytoestrogens content and breaks down the beans' complex proteins; so whole soy fermented products like tempeh and natto are more easily digested healthy foods than the original soybeans.

Sphingolipids in soy foods may reduce the risk of colon cancer. American Dietetic Association (ADA) and the Food and Drug Administration (FDA) agree that diets that include 25 to 50 grams of soy protein a day can help to lower levels of LDL or “bad” cholesterol, that is known to build up in and clog blood vessels leading to an increased risk of cardiovascular disease, so long as they are low in fat, saturated fat and cholesterol. Soy foods from whole soybean, such as tofu, soymilk, soy-based burgers, tempeh, and soy nuts, may also similarly qualify as healthy foods if no fat is added to that present in the whole soybean. Soy protein is also effective in supporting kidney health, and may cause calcium to be better utilized, helping to support bone health.

However, some substances in soy foods are suspected to cause health issues. These include phytic acid that may reduce vital minerals such as calcium, magnesium, copper, iron and zinc, and cause growth problems in children; trypsin inhibitors that may interfere with protein digestion and cause pancreatic disorders; some types of phytoestrogen that may promote breast cancer in adult women, disrupt endocrine function, cause infertility and hypothyroidism; aluminum which is toxic to the nervous system and kidneys; and oxalates, that may crystallize and cause health problems, and interfere with absorption of calcium. Cooking or fermentation may reduce some of those substances; however, for individuals with related health problems it is better to avoid soy foods and choose other healthy foods.