The principle of weight loss should be simple: energy intake does not exceed energy expenditure.

Dr Kennett however, believes that being obese or overweight is a result of a complex set of interactions among genetic, behavioral, environmental and emotional factors.

While numerous of weight management  strategies, diets and devices have been offered to the overweight public, the multi-factorial etiology of overweight is challenging, yet extremely important missing peace in everyone weight loss journey.

In addition, the elements of successful weight maintenance is also  reviewed since the difficulty in maintaining desired weight may contribute to the overweight problem.