Whey protein - protein foods for weight loss - IMAGE - Women's Health & Fitness
6. Whey Protein

Whey is a by-product of cheese production, and whey protein is a product made by isolating the protein in this by-product. It’s usually found in powdered form as protein shakes or supplements. Whey protein isolates tend to be the lowest in fat, but any kind of whey protein is a great source of amino acids, especially leucine, a muscle building amino acid.