Consumers with high cholesterol, Erdman said, should look for products that provide 10 grams of soy protein per serving and eat two to three servings per day. Studies at the UI have consistently shown that 20 grams of soy protein a day can significantly lower total cholesterol levels. Soy protein, an edible component of the soybean, is different from many other proteins derived from vegetable sources because it is complete. Like animal protein, it contains all the essential amino acids in sufficient quantities to support human life. Among the components of soy protein that may contribute to its cholesterol-lowering ability are trypsin inhibitors, phytic acid, sapopins, isoflavones and fiber.
Soy protein is available as a liquid, flour or concentrated powder.
Otherwise, the benefits may be diminished or lost.