Healthy eating clean "diets" suggest a "cheat" snack but in moderation and only once a week.
Eating clean is hard to do, at first until it becomes the habit, once eating clean is a habit it is no longer to focus on what you should eat because it becomes what you want to eat.
In another thread I made the comment about the book "the Abs Diet for Women" which is all about eating lean, healthy and clean. This book could answer this question for you and so much more.
Diets however is a word we have associated with something we get on to lose weight and then get off. Eating clean and right shouldn't be a "diet" because it is something we should do forever.