What is a serving of soy and what is the isoflavone count in a serving?
Many experts believe that it is better to obtain isoflavones from foods, instead of isolated in pills or supplemental foods, because it isn’t known yet whether other components of foods have an effect on the way isoflavones work in the body. 1 SERVING= (one serving contains about 40 mg. of isoflavones) 1 c. soymilk (regular or low-fat) 1/4 c. dry textured soy protein 4 oz. firm tofu (about 1/2 c.) 3 oz. extra-firm or pressed tofu 1/2 c. cooked soybeans, or green soybeans 4 oz. soybean tempeh 3/4 c. soy yogurt 1/3 c. roasted soybeans (soynuts) 1/3 c. soy flour Isolated soy protein powder (soy protein isolate) can contain from 15 to 103 mg. of isoflavones per oz., depending upon the brand, so you may have to check the label or even write to the manufacturer to find out how much your favorite brand contains. Solgar Iso-Soy Powder, GeniSoy Natural Protein powder, and Take Care Soy Protein Powder all have high levels of isoflavones. Tests are being done now on the isoflavone content of meat
