(Ripe) Bananas
Unlike some fruit, bananas contain mostly carbs. In fact, 93 percent of their calories come from carbohydrates. Also, they contain up to 16 percent sugar.
Unfortunately for ripe banana lovers, the healthy starches found in unripe bananas, which actually act more like fiber than carbohydrates, turn into sugar as a banana ripens. In the process, the banana becomes more and more sugary.