Diabetes is controlled by _____ hormone.

Insulin is the hormone produced by the beta cells of the pancreas that regulates blood glucose levels. In diabetes mellitus, either insufficient insulin is produced (Type 1) or the body cannot effectively use the insulin produced (Type 2), leading to high blood sugar. Thyroxine regulates metabolism, adrenaline is the fight-or-flight hormone, and thymosin is involved in T-cell development.