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Does Weight Change Affect Fecundity?

Study looks at increasing BMI in adulthood

Being overweight or obese in adulthood, gaining weight in adulthood, and being underweight at aged 18 years were associated with a modest reduction in fecundity in a study of 1,950 women currently attempting pregnancy. Height, current weight, and weight at aged 18 years were self-reported and every 3 to 6 months thereafter, participants reported the current duration of their pregnancy attempt. Study results included:

• For every 5-kg increase in body weight from age 18 years, current duration of pregnancy attempt increased by 5%.

• Compared with women who maintained weight, the adjusted median current duration was 0.5 months shorter in those who lost weight, 0.3 months longer for those who gained 4 to 9.9 kg and 10 to 19.9 kg, and 1.4 months longer for those who gained 20 kg or more.

• Being underweight at aged 18 years was associated with a longer current duration of pregnancy attempt compared with normal weight women.

• Being overweight or obese at aged 18 years was not associated with fecundity.

Citation: Gaskins AJ, Rich-Edwards JW, Missmer SA, Rosner B, Chavarro JE. Association of fecundity with changes in adult female weight. Obstet Gynecol. [Published online ahead of print September 3, 2015]. doi: 10.1097/AOG.0000000000001030.