An Impaired Awareness of Hypoglycemia Improved After Vitamin B Treatment in a Type 1 Diabetic Patient.

An impaired awareness of hypoglycemia is a serious problem in diabetic patients, which can lead to life-threatening severe hypoglycemia. Recurrent hypoglycemia attenuates the function of the central, mainly hypothalamic, nervous system and it causes an impaired awareness of hypoglycemia. Vitamin B deficiency is also associated with the dysfunction of central nervous system. We report a 72-year-old type 1 diabetic patient with vitamin B deficiency whose impaired awareness of hypoglycemia improved after 4 weeks of vitamin B administration with an increased counter-hormone secretion in response to hypoglycemia. We should recognize vitamin B deficiency as one of the causes of an impaired awareness of hypoglycemia in diabetic patients.