The 90/10 diet can be found in a book written by nutritionist Joy Bauer called The 90/10 Weight-Loss Plan: A Scientifically Designed Balance of Healthy Foods and Fun Foods. The plan allows 10% of your food to be "fun" foods of your choosing while following a controlled diet the rest of the time. If you have tried the plan, we want to hear your review of the 90/10 diet.