All Protein foods are not created equal and can vary in a number of ways including the following:
You’ll find that there are two main kinds of whey protein sold today - whey protein concentrate and isolate. The isolate is the most pure and concentrated form of protein available. It contains 90% or more protein and very little (if any) fat and lactose. The concentrate form has anywhere between 29% and 80% protein depending upon the product. As the protein level in whey protein concentrate decreases the amounts of fat and/or lactose usually increase.
Whey isolate is ideal everyone, not just professional athletes and body builders. It is a particularly good source of protein for people with special dietary needs like: