This is very difficult, but I can tell when my body NEEDS carbs rather than CRAVES them. It is a specific feeling in my body. I can't really describe it in words, but I just know. If I don't eat enough carbs I start feeling very nauseous. Anyhow, if you are trying to lose a lot of weight stay away from the fruit, or just eat berries which are lower in the glycemic index. I don't think I'm much help here. You just have to fine tune and experiment until you find the right balance for you, as it is very individual and can even change from day to day or season to season.

good luck!