90% of our increased calorie consumption since 1977 has come from snacking. So snacking is not only the biggest problem in terms of dietary excess, it is almost the entire problem.
Talk to yourself -- and record it. Why? Autotherapy. Catch all those great ideas that would have gotten away otherwise. Nag yourself into doing impossible tasks. Keep an even-keel diary that reflects a broader range of experience. Give serious books the serious attention they require.
Convenience is stronger than you are. Accept this fact. But with a little planning, the convenient thing doesn't have to be too awful. Case in point: "optimize your oatmeal."
Moderation isn't mushy. Learn from extremists by drawing hard lines -- just draw them in different places. Get the clarity of cold turkey abstinence without the sweeping deprivation.
No time to exercise? Get philosophical. Use enlightened self-mockery, a neo-Kantian personal categorical imperative, and an existential leap of action to get you moving.