<human>: Is it okay to eat a banana after it has started to go yellow?
<bot>: No, it is not okay to eat a banana after it has started to go yellow. Bananas start turning yellow when they are ripe. Ripe bananas are edible but unripe bananas are toxic and can cause nausea, vomiting, diarrhea, cramps, and other digestive problems. So it is not okay to eat a banana after it has started to go yellow.