When you have found something in your diet you'd like to improve on, give yourself adequate time to adjust mentally as well as physically. For instance, if dairy is very prevalent in your diet, don't eliminate it all together! This kind of enthusiasm is counterproductive. Try backing off of ice cream and cheese, while still relishing your morning latte. The whole self needs to be able to distinguish what is going on. Instead, gradually convince yourself of why and how you will reduce dairy in your diet.