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Lactation and Changes in Maternal Metabolic Risk Factors

From the ¹Division of Research, Epidemiology and Prevention Section, Kaiser Permanente, Oakland, California; ²Division of Preventive Medicine, University of Alabama at Birmingham, Birmingham, Alabama; and ³Division of Epidemiology and Clinical Applications, National Heart, Lung, and Blood Institute, Bethesda, Maryland.

OBJECTIVE: To examine the relationship between duration of lactation and changes in maternal metabolic risk factors.

METHODS: This 3-year prospective study examined changes in metabolic risk factors among lactating women from preconception to postweaning and among nonlactating women from preconception to postdelivery, in comparison with nongravid women. Of 1,051 (490 black, 561 white) women who attended two consecutive study visits in years 7 (1992–1993) and 10 (1995–1996), 942 were nongravid and 109 had one interim birth. Of parous women, 48 (45%) did not lactate, and 61 (55%) lactated and weaned before year 10. The lactated and weaned women were subdivided by duration of lactation into less than 3 months and 3 months or more. Multiple linear regression models estimated mean 3-year changes in metabolic risk factors adjusted for age, race, parity, education, and behavioral covariates.

RESULTS: Both parous women who did not lactate and parous women who lactated and weaned gained more weight (+5.6, +4.4 kg) and waist girth (+5.3, +4.9 cm) than nongravid women over the 3-year interval; P<.001. Low-density lipoprotein cholesterol (+6.7 mg/dL, P<.05) and fasting insulin (+2.6 microunits, P=.06) increased more for parous women who did not lactate than for nongravid and parous women who lactated and weaned. High-density lipoprotein cholesterol decrements for both parous women who did not lactate and parous women who lactated and weaned were 4.0 mg/dL greater than for nongravid women (P<.001). Among parous, lactated and weaned women, lactation for 3 months or longer was associated with a smaller decrement in high-density lipoprotein cholesterol (–1.3 mg/dL versus –7.3 mg/dL for less than 3 months; P<.01).

CONCLUSION: Lactation may attenuate unfavorable metabolic risk factor changes that occur with pregnancy, with effects apparent after weaning. As a modifiable behavior, lactation may affect women's future risk of cardiovascular and metabolic diseases.

LEVEL OF EVIDENCE: II

This article has been cited by other articles:

				E. P. Gunderson Breastfeeding After Gestational Diabetes Pregnancy: Subsequent obesity and type 2 diabetes in women and their offspring Diabetes Care, July 1, 2007; 30(Supplement_2): S161 - S168. [Full Text] [PDF]