Whey is the liquid portion of milk that is left over when the coagulated curds are separated, usually in the process of cheese making.  We all remember Little Miss Muffet eating her curds and whey!

Whey Protein is used as a concentrated source of high quality animal-based protein.  Whey Protein is a high quality source of calcium and lactotalbumin (a milk-specific protein).  It is also a rich source of immunoglobulins, proteins that function within the immune system.

A steady dietary supply of high quality animal protein is extremely important for cats.  Unlike dogs, cats are classified as "obligate carnivores", meaning they require animal protein in their diets.  Whey protein is an excellent choice for high quality animal protein.

High quality animal protein is critical for building and maintaining muscle mass in cats.  Proteins are called "the building blocks of life" and they are involved in virtually every bodily function.  Many cat foods are actually low in high quality animal protein, regardless the percentage of protein appearing on the label.  Lower quality plant proteins are frequently added to cat foods in order to raise the total protein value.  Plant proteins are generally incomplete and do not provide the correct mix of essential amino acids required by felines.  Corn gluten meal is an example of a lower quality plant protein source commonly added to cat foods.

Protein deficiency can lead to retarded skeletal and muscle growth.  It can result in a weakened immune system with the resulting susceptibility to infections and disease.