Soy protein powder is a high-quality protein source derived from soybeans. Like many other fruits and vegetables, soy protein contains flavonoids. According to the Linus Pauling Institute at Oregon State University, flavonoids are polyphenolic compounds found in plants that may promote good health. Soy protein powders are nutritional supplements, and you should consult your doctor before trying them.
Soy Protein
Soy protein powder is one of the most popular alternatives to whey protein for vegetarians or anyone looking for a high-quality protein source that contains virtually no saturated fat or cholesterol. According to American Heart Association, 25 g of soy protein per day has been shown to reduce the risk of heart disease. Virginia Uhley, Ph.D., agrees with this recommendation, saying 25 g of soy protein powder contains flavonoids that may promote heart health.
Flavonoids
Flavonoids are the broad category of polyphenolic compounds found in fruit and vegetables. A few of the other subcategories of flavonoids include flavanols, anthocyanidins and isoflavones. The type of flavonoids found in soy products, including soy protein powders, are called isoflavones. Isoflavones have an estrogenic effect on the body, so they are classified as phytoestrogens.
Benefits
Soy protein has been shown to promote heart health, however, isoflavones contained within the soy protein has not conclusively been shown to be the primary reason soy protein lowers risk of heart disease, as of June 2011. According to OSU, some research suggests the isoflavones in soy protein may help reduce the risk of certain cancers, such as breast or prostate cancers, although more studies are needed to state this as fact. The isoflavones in soy protein may also help lower the risk of osteoporosis by promoting bone growth.
Isoflavone Content
Different soy protein powders contain varying levels of isoflavones. OSU states 3.5-oz. servings of soy protein concentrates contain between 12 mg to 102 mg of isoflavones. The exact amount depends upon the manufacturing process of the soybeans into powder. The aqueous wash process yields about 102 mg of isoflavones while the alcohol wash process yields far less at about 12 mg, according to OSU. Soy protein powders may or may not list the washing process used to manufacturer the protein on the container.
Member Comments