Dieters who have managed to shed their excess weight need to do 90 minutes of exercise a day to keep the pounds off in the long term, according to a study. The finding comes as a leading nutritional researcher called on world leaders to tackle obesity with the same urgency as global efforts to tackle climate change. Rena Wing, professor of psychiatry and human behaviour at Brown University, told the American Association for the Advancement of Science meeting in Boston yesterday that exercising 60 to 90 minutes a day was essential to long term weight loss. By studying data on more than 5,000 men and women who have, on average, lost 70 pounds and kept the weight off for six years, she found that successful dieters had high levels of physical activity and consciously controlled their eating habits. This meant frequent weighing, following a consistent diet across the week and taking quick remedial action at the first sign of weight gain.
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