Check out my 7 Rules for Success - I LIVE by these rules and they keep me in great shape ALL year round without feeling deprived or going insane.
RULE #1 - ALWAYS eat a LEAN source of protein at EVERY meal! 
You can get your lean protein from many different sources.  Some of these include chicken breast, lean beef, turkey, fish, kangaroo and egg whites.  Eating enough protein is VITAL for muscle growth and repair not to mention many other essential bodily functions!

Check out my other rules