Which is healthier? Eat the rainbow! Especially in the form of seasonal fruits and veggies. Too high in sugar or carbs? Some sugar in the diet is OK, and fruit benefits include nutrients like fiber, vitamins and minerals. Apples are also a good source of vitamin C, which helps support the immune system. Bananas contain resistant starch, which the body is unable to digest and instead ferments in the colon. This helps promote healthy gut bacteria and slows digestion.