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What causes high blood glucose in diabetes mellitus?

High blood glucose in diabetes mellitus results when insulin does not help cells take up and use glucose effectively. Some patients have damaged or poorly working beta cells in the pancreas, so they release less insulin. Others have muscle and adipose cells that resist insulin’s effects. In either situation, cells take up less glucose from the blood, allowing blood glucose levels to rise. Extra glucose may then be removed through urine along with extra water.