All diets work in the short term
The weight loss obtained in a few weeks, is proportional to the caloric restriction imposed. That’s the good news. The poor, recalled in his book The Antirégime by Michel Desmurget, a former obese, and a phd in neuroscience, is that “over 100 individuals who have followed a restrictive diet, 95 gain all of the weight lost within two to five years”. Why this failure? First because of the physiology, and not because of a lack of will. Our body doesn’t lose weight. It is not programmed for this. “The body is perfectly unable to tell the difference between famine involuntarily endured and weight loss knowingly continued” Michel Desmurget, old, obese and a doctor of neuroscience The first few weeks the body will leave as a surprise, hence the loss of weight fast, but then it no longer has a single objective: to replenish its reserves. The fear of famine, as recorded in our genes by the slow polishing of the evolution, wins.
“The body is perfectly unable to tell the difference between famine involuntarily endured and weight loss knowingly pursued,” explains Michel Desmurget, “the phenomenon of recovery (pounds lost, editor’s NOTE) is very difficult to avoid all of the metabolic machinery adapts with force to oppose the weight-loss and in reversing the effects”.
Hunger is one of these ways. In a new study published in the American Journal of Physiology Endocrinology and Metabolism, academics in norway and in denmark show that the defenses taken by the organization to fight the restrictions are not only effective but tough. Two years after they have started a program with a hypocaloric diet, physical activity, consultations with nutritionists and psychologists, 35 adults with severe obesity (average weight of 129 lbs for a body mass index of about 42.5), had lost 11 kg on average, but they were always hungry.
Hormone faimUn result modest, but the most annoying thing is to see that their rates of ghrelin, the hunger hormone released by the stomach when loses weight, remained well above the average: “the patients continued to have hunger”, note the researchers in scandinavia. “Everyone has this hormone, but if you have been overweight and have lost weight, the rate of this hormone increases,” says Catia Martins, a professor associated with the faculty of medicine of the university of science and technology Norway (NTNU), who has headed this work. Weight for weight, an old obese will be more hungry than one who has not had to lose weight.
The rate of ghrelin is increased. “This is part of the risk factors of weight regain,” says the Figaro, the Pr Jean-Michel Lecerf, head of the nutrition department of the Pasteur Institute of Lille, author of Know his brain to eat better.
“This study explains why it is necessary to have modest goals in terms of obesity and focus on weight loss more gradual than fast. Stop weight gain is already a first success,” he adds. “Even for a loss is modest (less than 8% of the weight of the body) he continues to resist, two years after the beginning of the regime,” Michel Desmurget, old, obese and a doctor of neuroscience For Michel Desmurget, this study of the scandinavian shows the power of the physiological mechanisms of our body, once it has located the weight loss: “Even for a loss is modest (less than 8 % of the weight of the body) he continues to resist two years after the start of the plan. “It is necessary, therefore, to go slowly.
Weight quickly lost is also quickly regained.
Three years ago, australian researchers have wanted to verify this belief. They have submitted 200 obese either to an intensive diet and fast or a more gradual, with a target loss of about 15 kg. . The intensive diet based on total intakes of 450 to 800 kcal per day (60 % of kcal less). The progressive regime was to amputate the daily intake of 500 kcal (25 % of kcal less). The objective was achieved in three months with intensive diet and in nine months with the progressive regime.
Two and a half years later, three-quarters of participants in both groups had regained weight initially lost.
Because what seems to count is not only the speed of weight loss but the restriction of calories is still too important for those who have followed the progressive regime. To escape the radar of the brain, it would therefore be necessary to reduce very slightly its small excesses in food daily, while increasing his physical activity.