For exercise, the thing that works best for me is scheduling it in in a way that equally important to other things you HAVE to do, like going to work, going to class, or going to a doctors appointment. I like taking classes at the gym which have a definitive start and end time, becuase it helps me think of it as a realy scheduled thing I have to do.
For eating, I think about all the things i'm allowed to eat on whatever diet/eating plan I'm on, and make a big list of the things I like. I then stock my house with those items! I plan meals to cook, and plan snacks to have. It all HAS to be stuff I enjoy eating. I get rid of everything I don't want to eat because it's unhealthy. If I ALWAYS have food around that is on my diet plan, I'm much less likely to just eat convenient unhealthy foods.
"I don't know! I don't know why I did it, I don't know why I enjoyed it, and I don't know why I'll do it again!" -BART SIMPSON