Does fast food make you feel ill?

No matter which type of fast food I eat, I end up seriously not feeling well. Chips, burgers, chicken, why do I always end up feeling too full (even though I don't eat a lot of it) and ill?
Update: That's the trouble - I don't have fast food often, but I absolutely love it.

But I always feel ill. I think it's a carb overdose, that's why. Fast food is full of carbs, and being Asian, I eat carbs al the time, but doesn't fast food contain too many carbs??
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