Background: Currently, Diabetes Mellitus and Vitamin D deficiency are two conditions that frequently occur in all ages and the status Diabetes itself now includes 10 leading causes of death in the world. While Vitamin D deficiency, according to some results of epidemiological studies that have been conducted by experts, suggest a link to increased risk of Diabetes Mellitus both type 1 and type 2. The aim of this literature study was to determine the effects of vitamin D against type 2 Diabetes Mellitus , and the performance of vitamin D on the risk factors for type 2 Diabetes Mellitus. Methods: A literature study from various sources such articles Journal of Clinical Endocrinology and Metabolism vol 92,No 6, Journal of Diabetes and Metabolic Disorders, The American Journal of Clinical Nutrition, European Journal of Clinical Nutrition,Journal of Diabetology and Metabolic Syndrome . Research journals obtained were collected, then rewritten systematically and discussed in more depth. Results: A total of 8 studies and 3 reviews were discussed in this literature study. Having studied more in depth, it was found that vitamin D supplementation in patients with pre-diabetes can improve the performance of pancreatic beta cells and insulin sensitivity. In addition to supplementation, regulation of food intake of vitamin D may reduce the risk of type 2 Diabetes Mellitus. Conclusions: Vitamin D may affect the person's risk factors for developing diabetes mellitus type 2. However, further studies are needed to demonstrate the role of vitamin D against type 2 Diabetes Mellitus, along with the dosage and timing of vitamin D so that someone does not lack or excess of vitamin D. |