Nisian Hughes
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They say that old habits have a hard life . A new study in the Journal of Clinical Investigation ( JCI ) suggests that prolonged obesity can cause structural changes in the brain, altering responsible for maintenance of healthy weight parts and ultimately undermine your weight loss plans.
The result is consistent with a number of recent studies that suggest that each person can have a natural "set point" weight that our bodies are trying to maintain. But it was difficult to understand why overweight and obese should have their "set points" so high. The new JCI study is among the first to suggest physiological mechanisms that could prevent heavy people too heavy, even after they have started to make changes in healthy lifestyle.
"To explain a biologically elevated body weight 'set point' field investigators have speculated about the existence of fundamental changes to neurocircuits the brain that control energy balance," lead author the study, Michael Schwartz, told reporters. "Our results are the first to provide direct evidence of such a structural change, and include evidence in humans and in mice and rats."
Although Schwartz cautions that its results are not the final word, this is what the new study found:
Rodents who became obese in a diet rich in persistent developed fats " neuronal injury "in the hypothalamus - part of the brain that regulates many metabolic functions, including hunger and fatigue As mice and rats continued to eat junk food, their brains began to show. damage in the area that controls the weight control.
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Schwartz and colleagues then examined MRI scans of 34 obese humans, and found the same kind of injury among hypothalamus unusual raising the possibility that a common culprit may be at work in the promotion of obesity in speices.
The idea of a body weight "set point" has promising implications for the treatment of obesity. Although it is well known that people will lose weight when they burn more calories than they consume, our bodies have many ways to adjust the calories we use during normal office day to day, as muscle repair. This means that even if someone can control his calorie consumption exactly, it can not control its total energy balance - or how much he eats less how it burns. - With the same kind of precision
In addition, changes in hormone levels can also promote or suppress appetite. A 2011 study in the New England Journal of Medicine found that when obese people lost weight, they usually known hormonal changes that lead to hunger, making it much more difficult to reduce calories and maintain the new lower weight.
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For obese then it seems like a vicious circle. Excess weight now means that if you manage to lose weight in the future, you still face potential challenges when trying to maintain that healthy weight. It is unclear from the study whether the change is reversible in the hypothalamus, but alterations may explain why people who were once heavy may struggle with hunger and find that the books slide back on so unexpected - and fast frustrating. Many studies confirmed that successful dieters often find much of their lost weight within one year of the diet - even when people are able to stay long-term diet. Seeing that weight back in turn can cancel the motivation for the future weight maintenance, and add to the vicious circle.
So is a diet a futile effort for those who are overweight? Not necessarily. You might be fighting not only your eating habits, but some very powerful biological signals to eat, eat, eat.
But even if you struggle with your weight, there is no reason to lose hope just yet. Lose all the weight is better than now lost eight, and Fitness and a good diet can make you feel energetic, healthier and happier even if you shed as much as you intended.
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