Whey protein – I am a huge fan of it and believe that it should be part of your eating plan as well. Why? Because whey is great for building up the immune system and is the perfect protein, packed with every essential amino acid your body needs to help it soar through the day. So, what exactly is whey protein? Interestingly, it’s a by-product of cheese manufacturing. To make whey, pure amino acids are extracted from the cheese’s cast-off milk proteins, leaving the sugar (lactose), casein, fat and cholesterol behind. The resulting whey, which eventually is converted into powder, is simply the purest, cleanest, most easily absorbed protein source around.