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Is exercise the answer?
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Are fit people more likely to exercise than the sedentary…
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Exercise has long been touted as the panacea for everything that ails you. For better health, simply walk for 20 or 30 minutes a day, boosters say — and you don’t even have to do it all at once. Count a few minutes here and a few there, a
nd just add them up. Or wear a pedometer and keep track of your steps. However you manage it, you will lose weight, get your blood pressure under control and reduce your risk of osteoporosis.
If only it were so simple. While exercise has undeniable benefits, many, if not most, of its powers have been oversold. Sure, it can be fun. It can make you feel energised. And it may lift your mood. But before you turn to a fitness program as the solution to your particular health or weight concern, consider what science has found.
Moderate exercise, such as walking, can reduce the risk of diabetes in obese and sedentary people whose blood sugar is starting to rise. Active people are much less likely to smoke; they’re thinner and they eat differently than their sedentary peers. They also tend to be more educated, and education is one of the strongest predictors of good health in general and a longer life.
As a result, it is impossible to know with confidence whether exercise prevents heart disease or whether people who are less likely to get heart disease are also more likely to be exercising.
Scientists have much the same problem evaluating exercise and cancer. The same sort of studies that were done for heart disease find that people who exercised had lower rates of colon and breast cancer. But whether that result is cause or effect is not well established.
And what about weight loss? Lifting weights builds muscles but will not make you burn more calories. The muscle you gain is minuscule compared with the total amount of skeletal muscle in the body. And muscle has a very low metabolic rate when it’s at rest. (You can’t flex your biceps all the time.)
Weight loss can lower blood pressure and cholesterol levels, but if you want to lose weight, you have to diet as well as exercise. Exercise alone has not been shown to bring sustained weight loss. Just ask Steven Blair, an exercise researcher at the University of South Carolina. He runs every day and even runs marathons. But, he adds, “I was short, fat and bald when I started running, and I’m still short, fat and bald. Weight control is difficult for me. I fight the losing battle.”
The difficulty, Dr. Blair says, is that it’s much easier to eat 1,000 calories than to burn off 1,000 calories with exercise. As he relates, “An old football coach used to say, ‘I have all my assistants running five miles a day, but they eat 10 miles a day.’” (NYT)
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