alexa Duration of breastfeeding and risk of overweight: a meta-analysis.
Nutrition

Nutrition

Journal of Nutritional Disorders & Therapy

Author(s): Harder T, Bergmann R, Kallischnigg G, Plagemann A

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Abstract Observational studies suggest a longer duration of breastfeeding to be associated dose dependently with a decrease in risk of overweight in later life. The authors performed a comprehensive meta-analysis of the existing studies on duration of breastfeeding and risk of overweight. Studies were included that reported the odds ratio and 95\% confidence interval (or the data to calculate them) of overweight associated with breastfeeding and that reported the duration of breastfeeding and used exclusively formula-fed subjects as the referent. Seventeen studies met the inclusion criteria. By meta-regression, the duration of breastfeeding was inversely associated with the risk of overweight (regression coefficient=0.94, 95\% confidence interval (CI): 0.89, 0.98). Categorical analysis confirmed this dose-response association (<1 month of breastfeeding: odds ratio (OR)=1.0, 95\% CI: 0.65, 1.55; 1-3 months: OR=0.81, 95\% CI: 0.74, 0.88; 4-6 months: OR=0.76, 95\% CI: 0.67, 0.86; 7-9 months: OR=0.67, 95\% CI: 0.55, 0.82; >9 months: OR=0.68, 95\% CI: 0.50, 0.91). One month of breastfeeding was associated with a 4\% decrease in risk (OR=0.96/month of breastfeeding, 95\% CI: 0.94, 0.98). The definitions of overweight and age had no influence. These findings strongly support a dose-dependent association between longer duration of breastfeeding and decrease in risk of overweight. This article was published in Am J Epidemiol and referenced in Journal of Nutritional Disorders & Therapy

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