A patient of diabetes mellitus excretes glucose in urine even when he is kept in a carbohydrate free diet. It is because

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Fats are catabolised to form glucose

Amino acids are catabolised in liver

Amino acids are discharged into blood stream from liver

Glycogen from muscles is released into the blood stream

answer is A.

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Detailed Solution

In diabetes mellitus, a patient is unable to produce or utilize insulin hormone. The body of the patient becomes incapable to store glucose in the form of glycogen. Therefore, he starts excreting glucose in the urine. If a patient kept on a carbohydrate-free diet is excreting glucose in the urine, then this means, high level of glucose in the blood not only depends on dietary carbohydrates but also on glycogenolysis (breakdown of glycogen into glucose in the liver) and gluconeogenesis(breakdown of fats into glucose in adipose tissues).

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