Walking briskly for an hour a day can halve the tendency to obesity in people genetically predisposed to the condition, while a sedentary way of life that includes 4 hours or more of TV viewing a day can increase it by 50%, said researchers at an American Heart Association meeting in San Diego this week.

Lead author Dr Qibin Qi, a post-doctoral research fellow in the Department of Nutrition at Harvard School of Public Health in Boston, Massachusetts, and colleagues, examined data on 7,740 women and 4,564 men taking part in two prospective studies: the Nurses' Health Study and Health Professionals Follow-up Study.


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