I know that when we're trying to bulk we should eat more. but I was wondering how come all the food we eat don't goto our stomache on a bulk like it did to all the fat people?
well on a bulk you have to lift weights. By lifting weights you give your body a reason to need more calories. If you just decide to bulk and not lift, then it will go to your stomach.
It all depends on how fast you bulk. It's possible to gain weight without adding any fat but if you look at the strength guys like strongmen and powerlifters they normally have bellys because their Kcal surplus is higher than their muscles demand