Diabetes
The American Diabetes Association recommend eating bananas and other fruit as they contain fiber. They note that eating fiber can help lower blood sugar levels.

The author of a 2018 reviewTrusted Source concluded that eating a high fiber diet could reduce the risk of type 2 diabetes and may lower blood sugar in those who already have the disease

Banana support digestive health
Dietary fiber has been linked to many health.
Resistant starch, the type of fiber found in unripe bananas, is a prebiotic. Prebiotics escape digestion and end up in your large intestine, where they become food for the beneficial bacteria in your gut (probiotics).

What’s more, pectin — a fiber found in both ripe and unripe bananas — may help prevent constipation and soften stools.