HIF1A and diabetes mellitus: The significance of glycolysis in the regulation of bone mass was further supported by recent data suggesting defective glucose metabolism as the major cause of diabetes-induced bone loss, which showed that elevating glycolysis through administration of metformin or osteoblast-specific overexpression of Hif1a (hypoxia inducible factor 1 subunit alpha) or Pfkfb3 (6-phosphofructo-2-kinase/fructose-2,6-biphosphatase 3) in mice improved bone mass in diabetic mice.6