Your body needs Vitamin D to absorb calcium, for optimal immune function, to regulated blood pressure levels and for secretion of insulin. Adults usually need about 600 international units per day, so a shortfall in this amount can increase your risk for or worsen diabetes.
Prolong deficiency of Vitamin D can change the way your body creates and regulates insulin levels, thereby increasing your risk for and worsening Type 2 diabetes.
Your body can create Vitamin D if you spend some time in the outdoors each day, facing direct sunlight. You can also eat Vitamin D-rich foods such as tuna, eggs, dairy products, orange juice, salmon, sardines, beef liver and breakfast cereals.