If he eats only carbohydrates, he will grow very fat and won't have any immunity due to the shortage of minerals and vitamins. He will also have many problems and he will be obese. He also wouldn't have any strength as he will not be taking any proteins. Thus, it is important to have a balanced diet in order to stay healthy and fit.
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Hope it helps...
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He/she will be affected with  many diseases
one of them is Gastrointestinal Distress
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