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When Is It Safe for Breastfeeding Moms to Begin Losing 'Baby Fat'?

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WebMD Health News

Feb. 16, 2000 (New York) -- Overweight new moms who need to get back in shape can safely start taking off the pounds with diet and exercise within weeks of giving birth, even if they are breastfeeding, a new study shows. However, one researcher feels that women should wait until their newborn is 4 to 6 months old.

"There are women who are afraid of dieting while breastfeeding because they are worried about harming the milk supply," lead author Cheryl A. Lovelady, PhD, tells WebMD. "This study shows that women who are overweight and breastfeeding can get back into shape slowly -- losing an average of about one pound a week -- without affecting the weight gain of the baby." Lovelady is with the department of nutrition and food service systems at the University of North Carolina at Greensboro.

The 40 women in the study were overweight, though not obese. All were at least 20% over their ideal weight, with the average woman being about 5 feet 4 inches tall and weighing 145 to 175 pounds. Four weeks after delivery, they were assigned either to a diet and exercise program or to a no-diet group that was instructed not to exercise vigorously more than once a week or restrict their diet. Women in the diet and exercise group were prescribed a diet containing 25% of energy from fat, 20% from protein, and 55% from carbohydrates. The goal was to cut approximately 500 calories per day while maintaining a nutritious diet. Lovelady says the emphasis was on reducing the amount of sugar and fat. "Basically, there was a decrease in potato chips, a decrease in soft drinks -- those types of foods -- with the goal being a gradual weight loss and a sensible diet," she says. Women in both groups were prescribed a daily multivitamin.

The exercise program consisted of four sessions per week of brisk walking, jogging, or aerobic dancing. The women were instructed to start slowly and work up to a maximum of 45 minutes per session at a level within their target heart rate range.

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