Australian scientists have discovered why many people tend to “seize” the stress and nervous days absorb much more harmful products than usual.
It lies not in the psyche and in the brain, according to .
The staff of the Institute for medical research Garvan (Australia) conducted an experiment with laboratory mice, which were divided into two groups.
Some were placed in conventional cages, while others were under stressful conditions – in isolation, without the usual litter, waterlogged houses.
Diet rodents are also different – one is getting a balanced diet, the second was given foods with high fat content.
Two weeks later summarized the results. The mouse who ate healthy food, did not gain weight, regardless of the conditions in which they lived.
Those who were kept on fat diet gained weight, but in different ways. Rodents in a state of chronic stress scored significantly more extra grams than their calm counterparts, despite the same menu.
It turned out that mice, like humans, in a state of nervous tension eating a lot more.
“What is our life? Game!”“World mind games”: the premiere of “the World” to establish the true origins of this “phenomenon”, the scientists decided to study the brain of rodents.
It is known that feelings of appetite and hunger it controls the hypothalamus is a small region in the intermediate brain. In the immediate vicinity is located the amygdala, responsible for emotional reactions – anxiety and anxiety.
Both of these areas in response to stress produce a molecule neuropeptide Y (NPY). In the hypothalamus it stimulates the consumption of food.
In the course of the research, the scientists “turned off” in mice the production of NPY and again repeated the experiment with the stress and fatty foods. As a result, the rodents are placed in flooded cells, stop overeating and gained less weight.
The experiments also showed that neuropeptide Y may interact with insulin. The level of this hormone increases a little immediately after a meal that signals the hypothalamus – the body is sated.
In mice that experienced stress, and eat fatty foods, the insulin level was ten times higher than the “peaceful” brethren. But the brain cells have lost sensitivity to it – the feeling of fullness did not come, the development of NPY remained high and, accordingly, all together led to overeating.
At the same time reduced the body’s ability to process energy and burn excess fat.
The study authors could not say why the brain has formed such a mechanism. Probably he had once been life-saving for our distant ancestors.
“The lack of resources and starvation are stress, therefore, the consumption of more quantity of food under these conditions may be important for survival,” said author of the research paper Herbert Herzog.
Scientists have noted that the new data may indicate a promising way to combat obesity.
Previously, experts recommended that those who want to lose weight, give up bread. In baking contains harmful substance propionate, which contributes excess weight, but also increases the risk of hormonal disorders and diabetes.