A patient of diabetes mellitus excretes glucose in urine even when he is kept on a carbohydrate free diet. The most likely reason for that is

Amino acids are metabolized in the liver to form sugar

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Amino acids are discharged in the blood stream from the liver

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Fats are metabolized to form glucose

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None of these

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Solution

The correct option is C Fats are metabolized to form glucose
In diabetes mellitus, a patient is unable to produce or utilise insulin hormone. This hormone helps in maintaining the level of glucose in the blood by converting extra glucose into glycogen. Thus, in diabetes mellitus, 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).
So the correct option is 'Fats are metabolized to form glucose'.

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