For most Americans, the mango is a sweet, delicious, and exotic fruit that is a rare treat. Robinson says that's a big mistake; instead, we should eat them far more regularly than we do more common fruit such as bananas, pineapples, or papayas. Mangoes have five times more vitamin C than oranges, loads of fiber, and, surprisingly, are fairly low on the glycemic index (which measures how quickly foods turn to sugar in the bloodstream – generally slow and low is preferred). She explains that the best way to find a ripe mango is to ignore the color and instead take a good sniff. If it smells like a mango, it should be good to eat (and if you get a whiff of ammonia, then it's already overripe).