<human>: Is it safe to eat a banana after it has turned brown?
<bot>: Yes, it is safe to eat a banana that has turned brown. Bananas are generally ripe when they turn yellow and then brown. When bananas ripen, their starch converts into sugar and the natural enzymes in the banana break down the starches into simple sugars which can cause the fruit to turn brown. So it's safe to eat a banana that has turned brown.