Water deficiency in our body causes dehydration.

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Vitamins do not have any nutritive value.

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The presence of sugar in the diet can be tested with an iodine solution.

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A farmer requires a diet rich in vitamins. 

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Fats are the nutrients that protect us against diseases. 

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Fats form $70$ percent of our body weight. 

Why is it essential to include roughage in our diet?