I really think the best thing you can do is try something then really listen to your body to see how it reacts. Everyone is so very different.

I can eat artificial sugar and caffine till the cows come home and not have any negative effects. Diet sodas, coffee (with heavy cream and splenda or sweet n low), crystal light (I add 2 packets of sweet n low)... etc. On the other hand, I have tried the low-carb bars, even found some that I really like, but ALL of them stall me.

I haven't tried any fiber products yet, because my coffee and veggies are still enough to keep me regular, but the granola mentioned sounds good. Granola is one of those things that I love but am used to having with a big glass of milk. I might have to try it with a big cup of coffee instead.