Dude if you want to make yourself sick then go right ahead and stop asking for help. But here are some very legit reason why you should have carbs once in a blue moon.

Making energy isn’t the only thing your body does with the carbohydrate nutrients in your diet. Carbohydrates also protect your muscles. When you need energy, your body looks for glucose from carbohydrates first.

If no glucose is available, because you’re on a carbohydrate-restricted diet or have a medical condition that prevents you from using the carbohydrate foods you consume, your body begins to pull energy out of fatty tissue. Your body's next move is to burn its own protein tissue (muscles). If this use of proteins for energy continues long enough, you run out of fuel and die.

A diet that provides sufficient amounts of carbohydrates keeps your body from eating its own muscles. That’s why a carbohydrate-rich diet is sometimes described as protein sparing.

What else do carbohydrates do?
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Regulate the amount of sugar circulating in your blood so that all your cells get the energy they need.

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Provide nutrients for the friendly bacteria in your intestinal tract that help digest food.

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Assist in your body’s absorption of calcium.

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May help lower cholesterol levels and regulate blood pressure (these effects are special benefits of dietary fiber).