What is the metabolic abnormality that underlies the characteristic symptoms of diabetes mellitus?

What is the metabolic abnormality that underlies the characteristic symptoms of diabetes mellitus? A) a failure of the kidney tubules to reabsorb enough glucose from the urine B) a failure of the gastrointestinal epithelium to absorb enough glucose from the food C) an inability of the body’s cells to switch from glucose metabolism to fat [...] http://bit.ly/oOuot8