I agree with BountyHunter on the sugar/carb addiction. A human body is about %75 protein, %25 fat, and a wee bit carbohydrate and we do best if we eat close to that. Carbs should be consumed as complex carbs ie veggies and some fruit vs refined or simple carbs like sugar and starches.
Eat crap and feel like crap. also be aware, all those transfats in your processed food cause insulin-resistance at the cellular level which really compounds your blood-sugar handling problems.