Proteins from animal sources proteins are extremely popular among bodybuilders and others consuming a high-protein diet. They contain amino acids, which are the building blocks of protein. Essential amino acids are those that cannot be produced by the body, and must be gotten from complete proteins, which are proteins from animal sources and soy.
Because proteins from milk, egg and meat offer a complete spectrum of amino acids, some dieticians support the notion that animal-derived protein supplements enable muscle synthesis or weight loss. However, organizations including the Mayo Clinic warn that the benefits of protein supplements are highly debated; protein shakes are unnecessary and possibly harmful to people who already consume the recommended 40 to 60g of protein per day. Nevertheless, animal-sourced proteins each offer specific benefits that may suit the needs of some consumers.
Whey
A classic protein supplement with a complete amino acid profile, whey is one of the most popular products used by bodybuilders and other athletes. A 2007 report by the American College of Nutrition suggested that whey can enhance immunity, enable bone synthesis and provide an excellent source of dietary protein. Additionally, the report notes that preliminary evidence suggests that the protein contains compounds that fight cancer cells. Protein supplements containing whey are affordable and widely available.
Casein
Like whey, casein is a popular supplemental protein derived from milk. Because of casein's reputation for causing allergies and inflammation, casein supplements are not as popular as whey. The human digestive tract absorbs casein more slowly than weigh protein, so it may help a person to feel full. Casein may be a viable alternative for people who cannot effectively digest whey protein.
Egg
People who consume a dairy-free diet may turn to egg protein as a hypoallergenic alternative to other protein supplements. Many consumers prefer the taste and texture of egg protein supplements to the creamy flavors of dairy-derived products. By weight, egg protein has fewer calories than whey or casein; it is also more expensive. Like other animal-derived supplements, egg protein is a complete source of protein and offers every essential amino acid.
Beef Protein
Beef protein shakes are a new addition to the sports nutrition industry. MuscleMeds, a beef protein supplement manufacturer, claims that beef protein isolate contains significant amounts of naturally occurring B-vitamins and creatine. These products are heavily processed to eliminate meaty flavors. MuscleMeds offers both blue raspberry and fruit punch flavors. Studies have not evaluated beef protein's safety or efficacy as a sports nutrition supplement.
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