While green and yellow apples are allowed on your plate, grapes should be avoided. Grapes are known to be rich in antioxidants and have other great health benefits. But this does not change the fact that, like red apples, grapes are rich in carbohydrates and natural sugars. Even eating a small serving of grapes can slow or stop ketosis and impact fat loss and muscle gain. The adverse effects of grapes on the metabolism is similar when by-products of grapes, e.g., grape juices, raisins, or wine are consumed. Instead, you can opt for berries that help keep the body in a state of ketosis. Great choices are strawberries, blueberries, and blackberries. These are low in sugars and carbs, high in fiber, and rich in antioxidants.