Why do i feel the urgency to defecate right after eating my first food during the day?, it changes color(not my normal feaces color), its smelly and watery.

IBS: This could be irritable bowel syndrome or simply an exaggerated gastrocolic reflex where food entering the stomach sets off a peristaltic wave down through the intestinal tract into the rectum resulting in an urgent bowel movement. We all have this reflex to a certain degree. Taking an antispasmodic medication like dicyclomine 1/2 hour before breakfast mitigates this reflex. Discuss with your MD.