Simple Substitution #1: Lean Meat

High quality protein is essential to any weight loss or muscle building routine (Learn the truth about protein).  Although animal protein does almost always have the complete amino acid combination your body needs, you should be careful of the fat content.  Chicken breasts are always a good option, but just because you're on a diet doesn't mean you need to give up burgers.  Just opt for something that is at least 90% lean to cut fat and calories.  Grilling can also cook a lot of the fat out of meats.