There are two types of protein in milk: casein and whey. Casein is used to form cheese curds. Whey is a watery material left over after cheese production. Dumping leftover whey into local waterways was once the normal practice, according to registered dietitian Marjorie Geiser, but researchers have since discovered that this former waste product is actually a rich source of protein.
What's Whey?
Whey is a complete protein that is easy to digest. Your body absorbs it quickly, and it appears to offer immune system support. Unlike soy protein, whey protein doesn't hinder your ability to absorb other nutrients. The many assets of whey protein have made it a popular ingredient in several types of commercial products.
Sports Enhancement
According to MayoClinic.com, athletes use whey protein powder to build muscle strength and mass. Some combine whey protein powder with sports recovery drinks or consume protein bars containing whey powder after a bout of resistance training. The powder is also used to enhance athletic performance and assist in recovery after training. Numerous sports supplements are available that contain whey powder.
Appetite Suppressant
In addition to building muscle, whey protein has been used to aid in weight loss by reducing appetite. Protein is a nutrient that keeps the stomach feeling satisfied, but whey protein may be even satiating than other types of protein. A study published in "British Journal of Nutrition" in 2003 found that test subjects who took a whey protein supplement prior to indulging in a buffet dinner ate significantly less than those who took a casein supplement.
Infant Formulas
Whey protein is a common ingredient in infant formulas. According to NYU's Langone Medical Center, whey protein formulas have an advantage over standard infant formulas in that they are less likely to cause allergic reactions. This decreases the odds an infant consuming whey protein formula will experience colic or develop allergies later in life.
Considerations
There are several types of whey protein, all with varying nutritional content. As the protein content of whey increases, it's fat, lactose and mineral content decreases, according to Keri Marshall, N.D., M.S. For example, whey protein isolate contains between 90 and 95 percent protein, with little or no fat, lactose or minerals. Whey protein concentrate contains between 25 and 89 percent protein and includes some fat, lactose and minerals.
References
- MayoClinic.com; Whey Protein; August 2011
- "NCSA's Performance Training Journal"; The Wonders of Whey Protein; Marjorie Geiser, RD, NSCA-CPT
- "Alternative Medicine Review"; Therapeutic Applications of Whey Protein; Keri Marshall; 2004
- Ohio State University; Appetite Control; May 2003
- NYU Langone Medical Center; Whey Protein; August 2011
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