Whenever I talk about nutrition with clients, it always comes down to the same factor: finding the balance between what you know you should be doing (most people have a fairly good grasp on what's healthy and what's not), and what you are willing to do long term. Find that balance and you're golden. It's about being healthy, AND happy. If you feel like you're in a constant state of starvation and/or deprivation, you will not be happy. And if you're not happy, I can almost guarantee that you won't be healthy.