Modest exercise increase can curb weight gain after quitting smoking


For middle-aged women who worry about adding pounds when they quit smoking, a large study suggests that adding even a modest amount of weekly exercise after quitting can minimize weight gain.
Nearly 7 of 10 U.S. adult cigarette smokers say they want to quit, according to the Centers for Disease Control and Prevention. The fear of gaining weight discourages many of them.
“We found even a little bit of physical activity minimized weight gain after women stopped smoking,” study leader Juhua Luo of the School of Public Health at Indiana University in Bloomington told Reuters Health by phone.
Even walking for a weekly total of about 90 minutes at three miles per hour was enough to minimize weight gain after smoking cessation, Juhua said. The best results were seen when women engaged in 150 minutes of moderate intensity activity per week.
Surprisingly, “women who had low physical activity and then transitioned to increased physical activity after they quit smoking had the same weight benefit as women who were physically active before and after they quit smoking,” she said.
For three years, the study team tracked 4,717 smokers, ages 50 to 70, who were participating in the long-term Women’s Health Initiative study. The 2,282 women who quit smoking gained an overall average of 3.5 kilograms (7.72 lb).
The researchers gauged weekly physical activity levels by the type of activity, how intense or strenuous it was, and how long and how frequently a woman exercised to derive a value in so-called metabolic equivalents of task (MET). For example, one hour of moderate-intensity activities such as biking, easy swimming, folk dancing or using an exercise machine was valued at five METs. High-intensity exercise like aerobics was seven METs and low-intensity activity such as bowling, golf or walking at average speed counted as three METs.
Quitters who increased their levels of physical activity by 15 MET-hours per week or more, about the equivalent of 150 minutes of moderate-to-intense exercise, gained an average of 2.55 kg (5.62 lb) while those who did no exercise or decreased their activity gained an average 3.88 kg (8.55 lb).


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