By Piti Niyomsirivanich 90-95% of people who lose weight with diet gain most of the weight back within 3 to 5 years. Often times more body fat, or weight is gained back due to yo-yo dieting. Diet isn't the only thing study subjects did to lose weight. Most studies included exercise regimens. So any weight loss could have been due to exercise and not to diet. Many people in diet studies lost weight, gained it back, and went back on a diet before the end of the study. Such patients would be counted as having long-term weight loss when they simply lost weight only for a short period of time. Why don't diets work? There are two issues. The first is that it's just plain hard for people to change their eating behaviors. Lifestyle change will work if you have realistic expectations, good support, and choose a plan that you can stick with -- a plan that will give you moderate change over a long time. And the second reason is that even if you do succeed at a diet, the rule of diminishing returns comes into play. Rule of Diminishing Fat Storage Is a Natural Survival Mechanism. The body's ability to efficiently store fat began as a survival mechanism when our human ancestors were hunter-gatherers. Human beings lived in an environment that had no quick and easy sources of food. Early humans needed some kind of physical means to store energy. When our ancestor couldn't find food and went for long periods of time without food ,their bodies acted like a life preserver, storing fat in anticipation of the inevitable periods of famine. So when you ry to "diet" by going for long periods of time without eating , your brain senses the starvation and sends an SOS signal through your body to store fat because famine is on its way. That's why people who go on fasts and extremely low-calories diets don't lose the expected weight. Their protective mechanism preserve your body fat. The body developed this ability to slow down the metabolism and store extra fat during periods of famine. If we didn't have this ability,we would not have survived the lean times. When you keep to a reduced-calorie diet, your body makes metabolic adjustments that make it harder and harder for you to lose weight,Your body becomes very efficient, and you have to eat less and less to continue to lose weight. If you had the will to go on a diet, the fact that it steadily becomes less and less effective makes it even harder to stick to it. A lot of people go on a low-calorie diet for a few weeks and expect to lose a lot of weight. But if you do a crash diet, you will only regain the weight. Why is it so hard to lose weight? Diet is affected by social issues, by what you do when you are with your family and your friends. In the current American setting, which really encourages unhealthy eating and dietary patterns, it is difficult to keep these lifestyle changes going. People who want to achieve and maintain a healthy weight should start working at lifestyle changes they can maintain -- even if it means not losing weight, but just staying at the same weight. Conclusion. People should try to eat healthy food in moderation and exercise periods. Piti Niyomsirivanich ,M.D. , B.Sc.
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