According to the researchers, exercise prompts the body to use fat first to satisfy its energy needs. What saves the dietary sugars, mobilized later in the day. Suddenly, the appetite is reduced and the amount of stored fat. Physical activity reduces appetite, increases energy expenditure and perpetuates the loss of weight, according to studies pointed in rats. The low-calorie diets, very successful, often have a transitory effect, with a recovery hopeless weight in the weeks or months.
U.S. scientists argue in a paper published this week in the journal of the American Physiological Society, that the solution lies in physical exercise daily once the regime ended. If, intuitively, we perceive the merits of such a recommendation, these researchers did, however, demonstrate a masterly way by rigorous experimental work conducted on rats.
Weight gain seems, apparently, a simple mechanism that occurs when the calories in the diet exceed those expended during exercise. Scientists - global obesity epidemic requires - now working actively on these issues showed that the reality was far more complex and put into play very sophisticated physiological process. After a diet of signals to entice food intake: the fact of being hungry constantly having lost weight after a diet is a major cause of weight regain. "Most people are not able to ignore the physiological signal and are driven by their own biology to overeat and regain the pounds they have worked so hard to lose," said Dr. Paul MacLean sponsor of this study.
To understand the effect of physical activity in maintaining weight loss after diet, the authors are interested in rats genetically programmed to be fat. They were first fed for 16 weeks, with an unlimited food supply in a situation of complete inactivity, the then undergo a drastic diet, low fat and low calorie, making them lose 14% of their weight. Sixteen weeks later, the rodents have again been able to cram as much as they wanted, but half of them received in addition to a "treadmill" allowing them to exercise while the other rats remained sedentary.
The results, based on several very extensive analysis, show that rats subjected to physical exercise have taken little weight compared to those who did not, despite similar food supply. They also tended to burn more fat in the morning and more carbohydrates (sugars) later in the day. Finally, they have fewer fat cells and less fat in the abdomen, reduced their food intake and improved their ability to balance their consumption based on their energy costs.
"The sedentary rats tend to burn the sugar first and send the fats in fat tissue, helping to increase the caloric reserves, because the simple act of storing fat requires less energy to store sugars. Moreover, the burning of sugars could contribute to the feeling of constant hunger and the appetite of large sedentary animals, say the authors. While physical activity contributes primarily to burn fat. "According to the researchers, exercise prompts the body to use fat first to satisfy its energy needs. What saves the dietary sugars, mobilized later in the day. Suddenly, the appetite is reduced and the amount of stored fat.
Finally, until now, scholars believed that the number of fat cells was stable, but their size varied according to weight. Their work contradicts this dogma in sedentary rats, new cells appeared in the fatty tissue. These could accelerate the process of weight gain and promote fat storage in the abdomen, unlike what happens in rats 'active'.
U.S. scientists argue in a paper published this week in the journal of the American Physiological Society, that the solution lies in physical exercise daily once the regime ended. If, intuitively, we perceive the merits of such a recommendation, these researchers did, however, demonstrate a masterly way by rigorous experimental work conducted on rats.
Weight gain seems, apparently, a simple mechanism that occurs when the calories in the diet exceed those expended during exercise. Scientists - global obesity epidemic requires - now working actively on these issues showed that the reality was far more complex and put into play very sophisticated physiological process. After a diet of signals to entice food intake: the fact of being hungry constantly having lost weight after a diet is a major cause of weight regain. "Most people are not able to ignore the physiological signal and are driven by their own biology to overeat and regain the pounds they have worked so hard to lose," said Dr. Paul MacLean sponsor of this study.
To understand the effect of physical activity in maintaining weight loss after diet, the authors are interested in rats genetically programmed to be fat. They were first fed for 16 weeks, with an unlimited food supply in a situation of complete inactivity, the then undergo a drastic diet, low fat and low calorie, making them lose 14% of their weight. Sixteen weeks later, the rodents have again been able to cram as much as they wanted, but half of them received in addition to a "treadmill" allowing them to exercise while the other rats remained sedentary.
The results, based on several very extensive analysis, show that rats subjected to physical exercise have taken little weight compared to those who did not, despite similar food supply. They also tended to burn more fat in the morning and more carbohydrates (sugars) later in the day. Finally, they have fewer fat cells and less fat in the abdomen, reduced their food intake and improved their ability to balance their consumption based on their energy costs.
"The sedentary rats tend to burn the sugar first and send the fats in fat tissue, helping to increase the caloric reserves, because the simple act of storing fat requires less energy to store sugars. Moreover, the burning of sugars could contribute to the feeling of constant hunger and the appetite of large sedentary animals, say the authors. While physical activity contributes primarily to burn fat. "According to the researchers, exercise prompts the body to use fat first to satisfy its energy needs. What saves the dietary sugars, mobilized later in the day. Suddenly, the appetite is reduced and the amount of stored fat.
Finally, until now, scholars believed that the number of fat cells was stable, but their size varied according to weight. Their work contradicts this dogma in sedentary rats, new cells appeared in the fatty tissue. These could accelerate the process of weight gain and promote fat storage in the abdomen, unlike what happens in rats 'active'.
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