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Early and late menopause can increase risk of type 2 diabetes

July 27, 2016

PORTLAND, Ore., July 27, 2016 -- Women who begin menopause before age 46 or after 55 have an increased risk of developing type 2 diabetes, according to a study of more than 124,000 women enrolled in the Women's Health Initiative, a large national trial aimed at preventing disease in postmenopausal women.

The study, led by Kaiser Permanente researcher Erin LeBlanc, MD, MPH, was published today in the journal Menopause, the official journal of the North American Menopause Society.

According to the Society, the average age of menopause, or a woman's final menstrual period, is 51.

The study found that women who had their final menstrual period before age 46 were 25 percent more likely to develop type 2 diabetes, compared to women who had their final period between ages 46 and 55. Women who had their final period after age 55 had a 12 percent increased risk of developing diabetes.

After menopause, estrogen levels decline. These low levels of estrogen have been linked to increased body fat and appetite, decreased metabolism and high blood-sugar levels. Previous studies linked early menopause to an increased risk of diabetes, but this study is one of the first to show that later menopause also puts women at higher risk.

"Our study suggests the optimal window for menopause and diabetes risk is between the ages of 46 and 55," said Dr. LeBlanc, lead author and an investigator at the Kaiser Permanente Center for Health Research. "Women who start menopause before or after that window should be aware that they are at higher risk, and should be especially vigilant about reducing obesity, eating a healthy diet and exercising. These lifestyle changes will help to reduce their risk for type 2 diabetes."

Length of reproductive cycle also a factor

The study also found an association between the length of a woman's lifetime reproductive cycle and her risk of developing type 2 diabetes. The lifetime reproductive cycle starts when a woman begins her period and ends when she stops having a period. Women with the shortest lifetime reproductive cycles (less than 30 years) were 37 percent more likely to develop diabetes than those with medium length reproductive cycles (36 to 40 years). Women with the longest reproductive cycles (more than 45 years) were 23 percent more likely to develop diabetes compared to women with medium length reproductive cycles.

The differences in risk were reduced, but remained statistically significant after adjusting for several factors, including age, race, BMI, birth control use, hormone replacement therapy, number of pregnancies, physical activity and alcohol consumption.

Women's Health Initiative

The study participants were part of the Women's Health Initiative, a large national study of postmenopausal women focused on strategies for preventing heart disease, bone fractures, and breast and colorectal cancer.

Women ages 50 to 79 were recruited between 1993 and 1998 at 40 clinical sites and followed for about 12 years. The women completed extensive health questionnaires, including questions about reproductive history, age at first period and age of menopause. Diabetes diagnosis was determined through questions about medical history and medication use.
-end-
Funding for the Women's Health Initiative was provided by grants from the National Heart, Lung, and Blood Institute at the National Institutes of Health (HHSN268201100046C).

Additional authors include: Kristopher Kapphahn, Haley Hedlin, PhD, Manisha Desai, PhD, and Marcia Stefanick, PhD, Stanford University School of Medicine; Nisha I. Parikh, MD, University of California, San Francisco; Simin Liu, MD, ScD, Warren Alpert Medical School and School of Public Health of Brown University; Donna R. Parker, ScD, Center for Primary Care and Prevention, Memorial Hospital of Rhode Island; Matthew Anderson, MD, Department of Obstetrics and Gynecology, Baylor College of Medicine; Vanita Aroda, MD, and Shannon Sullivan, MD, MedStar, Washington Hospital Center; Nancy F. Woods, PhD, RN, FAAN, University of Washington School of Nursing; Molly E. Waring, PhD, University of Massachusetts Medical School; and Cora E. Lewis, MD, MSPH, FACP, FAHA, Division of Preventive Medicine, University of Alabama at Birmingham.

About the Kaiser Permanente Center for Health Research

The Kaiser Permanente Center for Health Research, founded in 1964, is a nonprofit research institution dedicated to advancing knowledge to improve health. It has research sites in Portland, Oregon, and Honolulu. Visit kpchr.org for more information.

About Kaiser Permanente

Kaiser Permanente is committed to helping shape the future of health care. We are recognized as one of America's leading health care providers and not-for-profit health plans. Founded in 1945, Kaiser Permanente has a mission to provide high-quality, affordable health care services and to improve the health of our members and the communities we serve. We currently serve more than 10.6 million members in eight states and the District of Columbia. Care for members and patients is focused on their total health and guided by their personal physicians, specialists and team of caregivers. Our expert and caring medical teams are empowered and supported by industry-leading technology advances and tools for health promotion, disease prevention, state-of-the-art care delivery and world-class chronic disease management. Kaiser Permanente is dedicated to care innovations, clinical research, health education and the support of community health. For more information, go to: kp.org/share.

Kaiser Permanente

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