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Old 07-04-2011
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Default Why doesn't exercise lead to weight loss?

Phys Ed: Why Doesn’t Exercise Lead to Weight Loss?

Sven Hagolani/Getty Images
For some time, researchers have been finding that people who exercise don’t necessarily lose weight. A study published online in September in The British Journal of Sports Medicine was the latest to report apparently disappointing slimming results. In the study, 58 obese people completed 12 weeks of supervised aerobic training without changing their diets. The group lost an average of a little more than seven pounds, and many lost barely half that.
How can that be? Exercise, it seems, should make you thin. Activity burns calories. No one doubts that.

“Walking, even at a very easy pace, you’ll probably burn three or four calories a minute,” beyond what you would use quietly sitting in a chair, said Dan Carey, Ph.D., an assistant professor of exercise physiology at the University of St. Thomas in Minnesota, who studies exercise and metabolism.
But few people, an overwhelming body of research shows, achieve significant weight loss with exercise alone, not without changing their eating habits. A new study from scientists at the University of Colorado School of Medicine in Denver offers some reasons why. For the study, the researchers recruited several groups of people. Some were lean endurance athletes; some sedentary and lean; some sedentary and obese. Each of the subjects agreed to spend, over the course of the experiment, several 24-hour periods in a special laboratory room (a walk-in calorimeter) that measures the number of calories a person burns. Using various calculations, the researchers could also tell whether the calories expended were in the form of fat or carbohydrates, the body’s two main fuel sources. Burning more fat than carbohydrates is obviously desirable for weight loss, since the fat being burned comes primarily from body fat stores, and we all, even the leanest among us, have plenty of those.
The Denver researchers were especially interested in how the athletes’ bodies would apportion and use calories. It has been well documented that regular endurance training increases the ability of the body to use fat as a fuel during exercise. They wondered, though, if the athletes — or any of the other subjects — would burn extra fat calories after exercising, a phenomenon that some exercisers (and even more diet and fitness books) call “afterburn.”
“Many people believe that you rev up” your metabolism after an exercise session “so that you burn additional body fat throughout the day,” said Edward Melanson, Ph.D., an associate professor in the division of endocrinology at the School of Medicine and the lead author of the study. If afterburn were found to exist, it would suggest that even if you replaced the calories you used during an exercise session, you should lose weight, without gaining weight — the proverbial free lunch.
Each of Melanson’s subjects spent 24 quiet hours in the calorimeter, followed later by another 24 hours that included an hourlong bout of stationary bicycling. The cycling was deliberately performed at a relatively easy intensity (about 55 percent of each person’s predetermined aerobic capacity). It is well known physiologically that, while high-intensity exercise demands mostly carbohydrate calories (since carbohydrates can quickly reach the bloodstream and, from there, laboring muscles), low-intensity exercise prompts the body to burn at least some stored fat. All of the subjects ate three meals a day.
To their surprise, the researchers found that none of the groups, including the athletes, experienced “afterburn.” They did not use additional body fat on the day when they exercised. In fact, most of the subjects burned slightly less fat over the 24-hour study period when they exercised than when they did not.
“The message of our work is really simple,” although not agreeable to hear, Melanson said. “It all comes down to energy balance,” or, as you might have guessed, calories in and calories out. People “are only burning 200 or 300 calories” in a typical 30-minute exercise session, Melanson points out. “You replace that with one bottle of Gatorade.”
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This does not mean that exercise has no impact on body weight, or that you can’t calibrate your workouts to maximize the amount of body fat that you burn, if that’s your goal.
“If you work out at an easy intensity, you will burn a higher percentage of fat calories” than if you work out a higher intensity, Carey says, so you should draw down some of the padding you’ve accumulated on the hips or elsewhere — if you don’t replace all of the calories afterward. To help those hoping to reduce their body fat, he published formulas in The Journal of Strength and Conditioning Research last month that detailed the heart rates at which a person could maximize fat burning. “Heart rates of between 105 and 134” beats per minute, Carey said, represent the fat-burning zone. “It’s probably best to work out near the top of that zone,” he says, “so that you burn more calories over all” than at the extremely leisurely lower end.
Perhaps just as important, bear in mind that exercise has benefits beyond weight reduction. In the study of obese people who took up exercise, most became notably healthier, increasing their aerobic capacity, decreasing their blood pressure and resting heart rates, and, the authors write, achieving “an acute exercise-induced increase in positive mood,” leading the authors to conclude that, “significant and meaningful health benefits can be achieved even in the presence of lower than expected exercise-induced weight loss.”
Finally and thankfully, exercise seems to aid, physiologically, in the battle to keep off body fat once it has been, through resolute calorie reduction, chiseled away. In other work by Melanson’s group, published in September, laboratory rats that had been overfed and then slimmed through calorie reduction were able to “defend” their lower weight more effectively if they ran on a treadmill and ate at will than if they had no access to a treadmill. The exercise seemed to reset certain metabolic pathways within the rats, Melanson says, that blunted their body’s drive to replace the lost fat. Similar mechanisms, he adds, probably operate within the bodies of humans, providing scientific justification for signing up for that Thanksgiving Day 5K.


From: http://well.blogs.nytimes.com/2009/1...o-weight-loss/
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  #2  
Old 06-22-2015
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Bad advice you've been getting. Exercise does cause weight loss but you must be consistent. Also eating the right foods is very important. Everything isn't a science and basic knowledge is all you need.
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Old 11-05-2015
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I know people who work very hard and eat right and the weight comes right off. I don't think it's normal to say you're not losing weight if you're exercising unless you aren't consistent with it! Consistency is key.
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Old 11-05-2015
Susan Susan is offline
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I have had a lot of success with exercising and eating healthy. The weight does come off and you feel so much better both physically and mentally. Exercise is a good thing.
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Old 11-19-2015
KimmyMarkks KimmyMarkks is offline
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I definitely think eating right is the biggest factor in losing weight. A lot of times overestimate the amount of calories they are burning at the gym and in turn try to justify what they eat.
There is a saying that "abs are made in the kitchen, but revealed at the gym." I think this is 100% true. However, if you want to really lose weight its important to eat healthy and exercise together.
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Old 11-22-2015
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This depends on how many calories you take in your body and how many you burn. Another thing is that a pond of muscle tissue occupies less space than a pound of fat. So you can end up leaner but heavier and pounds are not important if you look OK. My point is that weight is not crucial for any of us. If you manage to transform some of your energy/fat into muscles you are on a good way to become hot.
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Old 03-16-2016
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This happened to me. Back then, I just exercised without changing my diet. And although I felt like I lost weight, I really didn't. I weighed myself and I was still the same weight. So I tried dieting and exercising. That's when I got results actually! I started losing the excess pounds just by altering the portions of what I eat. Thankfully, right now, I'm at a much healthier weight. I'm struggling to lose that last ten pounds though.
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Old 03-29-2016
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Actually, the people who are having difficulties losing weight might have a very low metabolism due to which the speed of the burning of fat in their body. The people will low metabolism will not lose weight even after several months of exercise. So, my suggestion is to regularly check your metabolism so that you can ensure 'fair' weight loss.
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Old 03-29-2016
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the difficulty that some people face in losing weight sometimes seems to stem from heredity. They put the in the intense effort but they are never able to lose a great amount of weight. The parents and siblings of these persons usually have the large body type structures. I am if wondering heredity could really be a factor in inhibiting meaningful weight loss.
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