Eating a healthy, adrenal-supportive diet means avoiding high sugar foods as a high glycemic fruit can still be a healthy snack that will barely affect your blood. Fruit used to be considered as healthy as vegetables, but sugar gave it a bad rap. Should on fruit. A lot of our favorites, including grapes and bananas, are high in sugar. . An apple has fiber and water, which fill you up and slow digestion. 25 Popular Fruits—Ranked by Sugar Content! .. Rather than fiber, the high water content is the thing that keeps you full, which can help you.