Causes of Diabetes - Obesity and Inadequate physical work
Obesity

Nearly ninety per cent of overweight people will develop diabetes when around 40 to 60 years of age. The more you eat, the more the demand for insulin and the pancreatic cells collapse. Fat cells of fat people do not respond to regular supply of insulin. With less quantity and quality food and regular exercise, 80 per cent of the time your diabetes will disappear provided you developed diabetes only because of overweight. Obesity is a risk factor for Non-Insulin Dependent Diabetes Mellitus (niddm). But in case you are insulin dependent, obesity may not have much of a role to pay.
Inadequate physical work
Because of the industrialisation, man has drifted away from physical labour. Sedentary life, too, plays an important role in the origin of diabetes. During physical work, muscles use up a lot of glucose present in the blood. Consequently, the work-load on the pancreas is reduced. Moreover, physical labour also prevents or reduces obesity, which is intimately connected with diabetes.