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Practice MCAT Question - Q138 - Answer!

Under what conditions would you expect elevated ketone levels in the urine?

A.  High carbohydrate diet.
B.  Low carbohydrate diet.
C.  Fasting.
D.  B and C.

The correct answer is (D). High ketone levels in the urine are most commonly a result of fatty acid metabolism. The body metabolizes fats to provide molecules (glycerol and fatty acids) that can be used as substitutes for glucose in cell respiration when glucose levels are low. This can occur during situations such as the time between meals, during exercise, during periods of low carbohydrate intake, and during fasts.

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