Green bananas, in particular, have been shown to help with diarrhea. Bananas are also packed with fiber, prebiotics, and probiotics, all of which help with digestion.. For people with digestive conditions like irritable bowel syndrome, eating foods that aid with digestion may be particularly important.The resistant starch and pectin in green bananas can provide a number of health benefits, including improved blood sugar control and better digestive health ( 3 , 4 ). Green bananas contain a high amount of resistant starch and pectin, which have been linked to several health benefits.