A high proportion of the starch in unripe bananas is resistant starch, which passes through your gut undigested. In your large intestine, this starch is fermented by bacteria to form butyrate, a short-chain fatty acid that appears to have beneficial effects on gut health ( 4 ).

Are bananas a prebiotic food?

Bananas. Bananas are more than a delicious fruit: They're rich in vitamins, minerals, and fiber, and they contain small amounts of inulin. Unripe (green) bananas are high in resistant starch, which has prebiotic effects ( 37 ).

What fruits have prebiotics?