If i eat bananas in my diet then next morning i will have proper bowel movements but followed with some loose stool as well. but if i don't eat bananas then i see the bowel movement is there but the poop comes out in small pieces. can someone suggest?

Stool : Ideally, your stool should come out soft and in longer pieces and not small circular pieces. This suggests you need to eat fiber-rich foods daily for soft-form stool. Fiber-rich foods: spinach, oatmeal, broccoli. Suggestion: speak to your primary care physician for history/physical exam and suggestions or telemedicine eval. I hope this answers your question.