Acetone is an acidic substance naturally present in very small amounts in the blood and urine. Ketones including acetone are the products of the degradation of fats synthesized in the liver. When the body has only fat as an energy source such as when fasting for too long, an untreated diabetic, or vomiting too frequently, there is increased ketones in the blood (ketonemia) which becomes acid: this is ketoacidosis, which causes many problems including comas.
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. Translated by Jeff