Yeah. This is what I was thinking as well. High fiber, high protein foods. Cut out sugar and sugar-substitutes (like aspartame). Cut out simple carbs. Eat lots of fresh fish and nuts and plenty of leafy green vegetables. Switch to cooking with safflower oil. Cut out caffeine, cigarettes, and alcohol.

Look up 'mediterreanian diet' or 'south beach diet' for ideas.

Eat like that and I can almost guarantee you will notice an improvement in your mood and energy levels. Also your waist size, most likely.