Question: Are there any calories in fruits, such as watermelon, apples, oranges? 

Answer: Yes, most fruits are 60 calories per cup. One half of a large banana is 90 calories. A really good website for seeing the amount of calories you eat and their nutrient break down is below. On this site you can see the vitamins, minerals and calories of what you eat. You can also see how your exercises relates to your food intake.
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