So you asking “why do I poop right after I eat”, first, you should know it is really normal to poop right after eating. It is, however, an issue if the poop is not very, say, solid. Whenever we eat something, our body has a gastrocolic reflex that signals for more activity in the intestine as the food passes from the stomach. However, if the result of your poop is more soft or liquid than what we are used to, it might be caused by the irritable bowel syndrome. The contractions of your colon don’t work as it should, a longer contractions lead to diarrhea as water isn’t absorbed properly, or constipations for the lack of any contraction. Interestingly, the problem could be stemmed from stress, depression, anxiety and even a change in daily routine, so it is directly related to the brain. Do visit the doctor, keep in mind that there is no medicine that directly cure this problem yet.