I used to drink lipton diet green tea a lot and eventually I started feeling like I needed to binge on pizzas and sweet crap, or just eat a ton, at least once a week. After actually looking at the ingredients I saw aspartame and it all became clear. I think I really crave carbs and feel dependent on food with aspartame.
I then sucked it up and got some of the pyramid lipton bags of green tea and orange bits and stuff, and then started to actually like hot green tea with no sweetening or anything. I then got mighty leaf organic hojicha green tea and that, hot, without any additives, is my favorite drink besides milk now.