Bananas ripen and taste yummy when they do so that they get consumed when their seeds are matured. Of course, we’ve selectively bred bananas so that they don’t have seeds anymore.
The way that bananas get sweet over time is because of enzymes that break the complex carbohydrates — in this case, starch — into simple carbohydrates. Simple carbohydrates is just sugar. Enzymes are able to work even after the banana has been picked from the tree.
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