Our expert says:
Watermelon has one of the highest glycemic indices of all fruit. It is so high that the GI Foundation gives it a red coding. This means that it gives a very high insulin response and is easily stored as the body has a "sugar overload" followed by a sugar low as the insulin takes the carbohydrate into the cells. Watermelon is nutritious in that it has all the nutrients fruit normally contain, especially vitamin c. However the high GI must be watched.
An apple on the other hand is low glycemic and should make you feel full longer as it has good fibres.
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