Soy protein isolate is a dry powder without the other soybean components. It includes 90 to 95 percent protein and nearly carbohydrate and fat-free. Soy protein isolate supplies a high quality of protein that contains all essential amino acids needed for growth. Soy protein isolate is equal in quality to animal products and is almost fat-free containing less than 1 percent fat and unlike animal products contains no cholesterol and little or no saturated fat. 25 grams of soy protein in a daily diet low in saturated fat and cholesterol help reduce total and LDL cholesterol that is moderately high to high.