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TYPE 2 DIABETES: NOT A CHRONIC DISEASE
Weight Gain and Type 2 Diabetes
Even though being overweight or obese has a direct correlation to the development of type 2 diabetes in the general population,  interestingly, it does not adequately explain the diabetes risk among obese individuals. 
Abdominal or visceral fat is found under the abdominal muscle and around organs like the intestines, liver and pancreas. It is different from subcutaneous fat, the kind of fat that you can pinch. A 2012 study observational study of 732 obese participants concluded that abdominal fat was associated with more than a twofold increased risk of developing type 2 diabetes. 
Research has shown that the primary cause of type 2 diabetes is the buildup of visceral fat in the liver and pancreas; a condition that prevents normal insulin action and secretion, both of which are reversible with weight loss. Crucially the tolerance of fat within the liver and pancreas varies widely depending on the individual, and type 2 diabetes develops only when there is more fat than can be coped with. Fortunately, the reverse is also true, and when the fat level drops below the individual threshold, the diabetes reverses.