HOW TO LOSE WEIGHT AND KEEP IT OFF? ETERNAL DIETING VIGILANCE
"Although cutting calories can cause weight loss, it does not follow that if a person returns to their usual diet they will maintain their new low weight. In fact, studies have found that after a low calorie diet, between one- and two-thirds of people regain more weightthan they had lost initially.
The fundamental problem with cutting calories is that the human body defends its original weight. Evolution has produced a body that anticipates future famine, with the result that when you reduce calorie intake there are strong physiological pressures to replace the lost energy.
For example, dieting causes the gut to release a range of hormones that increase appetite: changes that are still apparent after the diet is over. Leptin—which makes one feel satisfied and full—has been found to be still reduced a year after dieting has finished, while ghrelin, a hormone which stimulates appetite, remains raised. So even a year after a person finishes their diet, they will feel hungrier than when they started dieting, and still anticipate a higher food consumption than before the diet."
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