Weight loss improves bladder control in women with prediabetes

January 27, 2006

Diabetes prevention study reveals another benefit of lifestyle changes

Losing a modest amount of weight through dietary changes and increased physical activity reduces the occurrence of urinary incontinence (UI) in women with prediabetes, a condition in which blood glucose levels are higher than normal but not yet diabetic. This finding comes from a new study, published in the February issue of Diabetes Care, of women who participated in the Diabetes Prevention Program (DPP), a landmark clinical study funded by the National Institutes of Health (NIH).

Launched in 1995, the DPP's main results were announced in 2001 and reported in 2002 [http://www.nih.gov/news/pr/feb2002/hhs-06.htm]: losing 5 to 7 percent of weight through diet and a consistent increase in physical activity (e.g., walking 5 days a week 30 minutes a day) reduced the onset of type 2 diabetes by 58 percent. Treatment with metformin lowered the chances of developing diabetes by 31 percent.

"To combat the dual epidemics of obesity and type 2 diabetes, Americans need to know about the proven benefits of losing some weight through calorie reduction and increased physical activity," said NIH Director Elias A. Zerhouni, M.D.

The DPP randomly assigned 3,234 overweight people with higher-than-normal blood glucose levels to one of three approaches to prevent type 2 diabetes: dietary changes and increased physical activity aimed at a 7-percent weight loss; treatment with the oral diabetes drug metformin; or placebo. The last two groups were also given standard medical advice about diet and weight loss. In the study, 660 women were randomly assigned to intensive lifestyle changes, 636 to metformin treatment, and 661 to placebo. Their average age was 50 years old, with an average body mass index of 35 (e.g., a 5' 4" woman weighing 204 pounds).

Women who implemented intensive lifestyle changes and lost 5 to 7 percent of their weight had fewer episodes of weekly incontinence compared to those in the metformin or placebo groups (38 percent vs. 48 percent vs. 46 percent, respectively.)

"Our findings reinforce the DPP's good news about the benefits of modest weight loss. A 200-pound woman who loses 10 to 15 pounds not only lowers the risk of developing type 2 diabetes but also improves bladder control," said lead author Jeanette S. Brown, M.D., of the University of California, San Francisco. "If you're a woman at risk for type 2 diabetes, preventing or delaying diabetes and improving bladder control are powerful reasons to make these lifestyle changes."

Weight loss was particularly effective in reducing episodes of stress incontinence-leakage of small amounts of urine during physical movement, such as coughing, sneezing, and exercising. Stress incontinence results, in large part, from a weakening of the pelvic floor muscles that support the bladder. Though researchers do not fully understand all the factors contributing to stress incontinence, it is linked to obesity, diabetes, and other conditions, such as pregnancy, which increase pressure on the pelvic floor. In the DPP participants, weight loss did not alleviate urge incontinence-leakage of urine at unexpected times. Urge incontinence is more closely linked to overactive nerves that control the bladder, sometimes triggering inappropriate contractions.

More than 13 million people in the United States, mostly middle-aged and older women, experience loss of bladder control. Overweight women and those with type 2 diabetes have a 50- to 70-percent increased risk of incontinence. In the National Health and Nutrition Examination Survey 2001-2002 sample, one out of three women with diabetes or prediabetic glucose levels reported weekly or more frequent episodes of UI.

Some studies have reported that increased physical activity worsens incontinence, but DPP participants randomly assigned to lifestyle changes, who typically chose walking as their physical activity, did not have increased problems with incontinence.

"Urinary incontinence is a costly, socially isolating condition that impairs quality of life and takes a psychological toll on many women. For women at risk for type 2 diabetes, losing a modest amount of weight is likely to alleviate incontinence, especially stress incontinence,\\\

NIH/National Institute of Diabetes and Digestive and Kidney Diseases

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