Difference Between Soy Protein & Whey Protein

Getting protein in your diet can be difficult, unless you consume meat. Whey protein and soy protein are both vegetarian options that are high in protein. Each type of protein can be found in supplement form, and are often used by bodybuilders or other individuals to increase muscle mass. In order to determine which type of protein is best for your needs, it is good to know the difference between them.

Sources

Soy protein comes from the soybean plant. Whey protein is derived from milk. Strict vegetarians who do not drink dairy products or people with dairy intolerances may wish to choose soy protein.

Phytoestrogens

Soy protein contains phytoestrogens, which increase the amount of estrogen in the body. Because building muscle is inhibited to some extent by estrogen, there is some contention over whether bodybuilders should avoid soy (see Resources).

Metabolism

Whey is more rapidly broken down and utilized by the body than soy protein (see Resources).

Quality

Soy has a better balance of amino acids and is considered a higher-quality protein than whey.

Health Benefits

Soy protein has the added health benefit of reducing the risk of cardiovascular disease, lower cholesterol, and reducing the risk of several cancers (see Resources).

Cost

Whey protein is generally more expensive than soy protein.

Resources

• Bodybuilder's guide to protein sources
• The latest research regarding soy and whey proteins
• Soy health benefits