Fast Food
An_258620 posted:
Why does my stomach react so negatively to eating fast food?
georgiagail responded:
Perhaps it's telling you it doesn't like all that grease in the stuff.

rohvannyn responded:
Also, fast food is usually full of sugar and preservatives. Depends on what kind you eat, of course. So there is a lot that your body might get tired of trying to digest. Sometimes it gets worse if you have been eating relatively "clean," whole, and healthy foods, and then you go back to fast food. You sometimes see a really big difference then!