Researchers from the Medical Research Council in Britain have found that dieting is a poor way of reducing weight

The researchers found that both groups of people gained weight, with men gaining weight steadily throughout their lives while women tend to put on the pounds when they enter mid-thirties.
The researchers said that very few people managed to get their weight back to normal while dieting had no long term impact on weight loss. Instead of dieting, the researchers recommended staying away from fattening food.
Source-Medindia