LETTER TO THE EDITOR |
Niko Kaciroti, PhD
Center for Human Growth and Development,
University of Michigan,
Ann Arbor, MI 48109-0456
Robert F. Corwyn, PhD
Department of Psychology
Robert H. Bradley, PhD
Center for Applied Studies in Education,
University of Arkansas,
Little Rock, AR 72204
Julie C. Lumeng, MD
Child Behavioral Health,
Department of Pediatrics
Center for Human Growth and Development,
University of Michigan,
Ann Arbor, MI 48109-0456
We appreciate the letter from Mesrine et al regarding our article linking weight status at a young age with earlier onset of puberty,1 which cited previous literature that linked early puberty to higher rates of breast cancer.2 Mesrine et al highlight the findings of a recent study that evaluated the association of age at menarche and adiposity with breast cancer risk in a French cohort of women.3 In the overall population, higher rates of breast cancer were associated with early age at menarche,3 which is consistent with previous literature.2 However, this study also found that after adjustment for age at menarche, the greater the adiposity during childhood, the lower the relative risk of breast cancer compared with normal-weight individuals, which suggests that there may be a protective effect of childhood obesity on breast cancer risk.3
Our study focused on the link between weight status in early childhood and timing of puberty, and although we did cite previous literature that linked early puberty with higher rates of breast cancer, we were not suggesting that our study provided evidence for a link between childhood obesity and breast cancer. We agree with Mesrine et al that additional studies need to be performed to fully explore the long-term effects of childhood obesity and, in particular, how obesity may act as an effect modifier on the association between timing of pubertal onset and the risk for breast cancer. Despite the possible protective effects of childhood obesity on breast cancer risk, the health risks associated with obesity in childhood, including development of type 2 diabetes,4 hypertension,5 hyperlipidemia,5,6 and polycystic ovarian syndrome,7 suggest the need for public health programs for prevention of childhood obesity. However, the paradoxical association between childhood obesity and lower breast cancer risk does raise important research questions that may lead to a better understanding of the mechanisms of breast cancer risk and the long-term effects of weight status during childhood.
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