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Home » Lose Weight » Why exercising by itself isn’t enough for you to lose weight – South China Morning Post

Exercise by itself wont help you lose weight.

This is not to say that exercise isnt good for you; it is, in fact, great for you. It conveys an astonishing array of health benefits.

But and we all hate hearing this many experts, while extolling the benefits of exercise, say the primary villain when it comes to excess weight is whats on our menu. To lose weight, we have to cut calories.

Exercise helps keep lost weight away, but alone it cant do the initial job of losing it.

I think the role of exercise in weight loss is highly overrated, says Marc Reitman, chief of the diabetes, endocrinology and obesity branch of the US National Institute of Diabetes and Digestive and Kidney Diseases, or NIDDK. I think its really great for being healthy, but Im a strong believer that overeating is what causes obesity. To exercise your way out of overeating is impossible.

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Michael Joyner, a Mayo Clinic researcher who studies how people respond to the stress of exercise, agrees. The key for weight loss is to generate and maintain a calorie deficit, he says. Its pretty easy to get people to eat 1,000 calories less per day, but to get them to do 1,000 calories per day of exercise walking 10 miles is daunting at many levels, because of lack of time and motivation, he says.

To be sure, some people can work weight off, experts say. These include those who exercise vigorously for long periods, and professional athletes, who typically engage in high-intensity workouts.

But they are the exceptions. Those high-level workouts are not something most people do, says Philip F. Smith, co-director of NIDDKs office of obesity research. Walking for an hour wont do it.

Joyner agrees. Theoretically, people can exercise enough to lose without changing what they eat, but they have to exercise a lot, he says.

Burn more calories than you consume to get rid of that big fat problem

Moreover, moderate exercise doesnt really burn all that many calories, especially when you think about a single piece of chocolate cake, which has between 200 and 500 calories. Most people burn only about 100 calories for every mile of running or walking, although this can vary depending on the person, according to Joyner. Put another way, to lose one kilogram, you must run a deficit of about 7,700 calories meaning that if you burn an excess 500 calories a day, it would take more than two weeks to shed that weight.

Kevin D. Hall, an NIDDK scientist who studies how metabolism and the brain adapt to diet and exercise, agrees that a modest degree of weight loss would require large amounts of exercise. However, high levels of physical activity seem to be very important for maintenance of lost weight, he adds, defining high as more than an hour of exercise daily.

In a recent study, Hall concluded that exercise typically result[s] in less average weight loss than expected, based on the exercise calories expended, and that individual weight changes are highly variable even when people stick to exercise regimens.

If you sweat more while exercising, do you burn more calories?

The likely reason is that people tend to compensate for changes in food intake and non-exercise physical activities, Hall wrote. Or, as Joyner puts it: If people replace non-exercise but otherwise active time with sedentary time, sometimes things cancel out.

Strength training or resistance training lifting weights, for example is important for overall health, but, as with other forms of exercise, it doesnt prompt weight loss. (In fact, it may cause the reading on the scale to inch up a bit, because muscle is denser than fat.) Nevertheless, strength training is good to maintain lean tissue, Joyner says.

And you cant count on exercise to increase your metabolism for several hours after.

Exercise, if hard enough and long enough, certainly can do this, Joyner says. But again, it depends on how much, what type and how hard. A two-mile (3.2km) stroll, while a good thing, will not do too much to resting metabolism.

But now the good news: exercise remains one of the best things you can do for yourself. It enhances health in numerous ways.

It strengthens the heart and lungs. It reduces the risk of Type 2 diabetes and metabolic syndrome, a collection of symptoms that include hypertension, high blood sugar, excess body fat around the waist and abnormal cholesterol or triglyceride levels.

Weight-bearing activities, such as running, strengthen bones and muscles. Having strong bones prevents osteoporosis, helping to avert bone-breaking falls in the elderly. For older people, exercise facilitates the capacity for them to stay engaged in life, Joyner says.

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Exercise also reduces the risk of certain cancers, including breast and colon cancer. It elevates mood, and it keeps thinking and judgment skills sharp.

Overall, it helps you live longer. People who work out for about seven hours a week have a 40 per cent lower risk of dying early compared with those who exercise less than 30 minutes a week, according to the Centres for Disease Control and Prevention.

Exercise in almost any dose does so many good things for people, Joyner says.

Is one exercise more effective than another?

I love to play soccer, Smith says. I would do anything to play soccer, and try to play three times a week until my body cant take it. But people should exercise as much as they can tolerate and enjoy. Thats what they should shoot for.

Reitman agrees. The best exercise is the one you keep doing, he says.

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Why exercising by itself isn't enough for you to lose weight - South China Morning Post

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Home » Lose Weight » Why exercising by itself isn’t enough for you to lose weight – South China Morning Post