But cantaloupe is much more difficult to digest than a mango, and it's usually recommended you don't eat them along with other foods. Those who live where mangos are plentiful are not obese by nature. It's more complicated than that. Eating one mango is okay. Eating a bunch of them isn't. While grapes have a high sugar content, dark grapes are one of the foods richest in antioxidants, along with berries. So there's a balance. High sugar fruits should definitely be eaten in moderation, but are often contain things that are much better for you than low sugar ones. Again, a balance. More depends on what else you're eating than the fear of eating a piece of fruit.