Whey protein is a nutritious ingredient and source of essential amino acids. It is produced during cheese manufacturing and concentrated through a series of filtration and purification steps. It is added to a variety of food and dietary supplements to increase protein content and modify texture. As an easily digestible and concentrated form of protein, whey is a popular ingredient in infant formula and sports nutrition products.
Source
The protein in cow's milk consists of 20 percent whey and 80 percent casein. Whey protein becomes a byproduct of cheese manufacturing when its liquid is separated from the casein and milk fat. This liquid is then run through filters to remove lactose, and concentrated using a technique called ion exchange. The final step involves drying into a powdered form for use as whey protein isolate or concentrate.
Nutrition
Protein is an important nutrient that your body uses for energy and maintaining healthy muscles, bones, organs, immune cells and hormones. Whey protein is a complete source of protein that contains all nine of the essential amino acids that your body needs. It is also the highest source of leucine, isoleucine and valine, which are important amino acids for athletes who need to repair lean muscle tissues. Whey protein has been tested for the prevention and treatment of various health conditions, such as allergies, diabetes, cardiovascular disease and constipation, but more research is needed to determine its effectiveness.
Variety
Whey protein is sold as an isolate and a concentrate. The isolate is a higher-quality product that contains about 90 percent protein and almost no fat or lactose. Whey concentrates contain between 29 and 89 percent protein, and variable concentrations of fat and lactose. Hydrolyzed whey protein is a form that is often included in infant products and medical supplements. This is because it contains shorter protein molecules and fewer people are allergic to it.
Products
Because whey protein is water soluble, it is easier to incorporate into food than casein protein. It is used in numerous types of food products, such as infant formula, ice cream, bread and energy bars, as well as dietary supplements used for controlling blood glucose, suppressing appetite and increasing muscle mass. As an ingredient, whey protein is used to increase the nutritional value and increase the heat stability of food.
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