Diabetes Mellitus (DM) is a group of metabolic diseases caused by high blood sugar (glucose) levels that result from defect secretion, or action or both. Insulin enables cells to absorb glucose in order to turn it into energy. This causes glucose to accumulate in the blood (hyperglycaemia), leading to various potential complications.Type 2 diabetes is a global public health crisis that threatens the economies of all nations, particularly developing countries. Fueled by rapid urbanization, nutrition transition, and increasingly sedentary lifestyles, the epidemic has grown in parallel with the worldwide rise in obesity, and the disease may start very early when the obesity presents at childhood.Vitamin D, also known as calciferol, is a fat soluble vitamin. It is different from all other fat soluble vitamins, in that the body can synthesise it with the help of sunlight, from a precursor that the body makes from cholesterol. Therefore, vitamin D can be regarded as a non-essential nutrient. Given enough exposure to the sunlight, we do not need vitamin D from foods.