Both obesity and diabetes are closely related to diet and nutrition. Whereas diet can become the direct cause of obesity,  diabetes can be treated and managed by regulating the diet. 

Obese diabetics are normally of the non-insulin-dependent (type II) variety, in whom weight loss can be of great advantage. However, caution is required if diabetics are taking insulin or hypoglycemic drugs, because a change in diet or weight loss will affect the dosage required to manage diabetes. The same applies to hypertensive patients, who will need to reduce medication during and after weight loss. Diabetes is closely related to cardiovascular disease, which can also be managed by the application of dietary and nutritional principles.

Obesity has been identified as one of the most important public health problems  and its prevalence has increased in recent years. The health hazards of obesity have been recognized even better in the affluent countries of the world. Cardiovascular disease is the main cause of increased mortality