Felício JS, de Alcântara AL, Janaú LC, de Moraes LV, de Oliveira MCNI, de Lemos MN, de Souza Neto NJK, Neto JFA, da Silva WM, de Souza ÍJA, Said NM, de Lemos GN, Vieira GM, Khayat AS, dos Santos ÂKCR, de Queiroz NNM, de Sousa ACCB, dos Santos MC, de Melo FTC, Piani PPF, Felício KM. Association of Soy and Exclusive Breastfeeding With Central Precocious Puberty: A Case-Control Study.
Front Endocrinol (Lausanne) 2021;
12:667029. [PMID:
34290667 PMCID:
PMC8287825 DOI:
10.3389/fendo.2021.667029]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 06/11/2021] [Indexed: 11/13/2022] Open
Abstract
Introduction
While soy is suggested as a possible risk factor, exclusive breastfeeding (EBF) has a likely protective effect in precocious puberty. Our aim was to evaluate the association between both of these variables with central precocious puberty (CPP).
Methods
We performed a retrospective, case-control study. A total of 161 girls were divided into two groups: 84 patients diagnosed with CPP composed the case group and 77 patients without the diagnosis of CPP (had gone through normal onset of puberty) were the control group.
Results
Our control group had a higher presence of EBF >6 months, which was an important protective factor for CPP (OR: 0.5; IC 95%: 0.3-0.9, p = 0.05) and also correlated negatively with the presence of it (r = -0.2; p < 0.05). Oppositely, the use of soy was significantly higher in the CPP group, (OR: 3.8; IC 95%: 1.5-6, p < 0.05) and positively correlating (r = 0.2; p < 0.01) with the presence of CPP. Duration of soy intake (years) correlated with bone age (r = 0.415; p < 0.05). A logistic regression was performed to evaluate the effects of EBF duration and soy on CPP. The model was significant (x² (2) = 20,715, p = <0.001) and explained 12.2% (Nagelkerke R2) of the variance, correctly classifying 62.5% of cases. EBF was associated with a reduction of likelihood of having CPP [OR = 0,187 (CI = 0.055-0,635); Wald = 7,222, p = 0.007], while soy intake increased the risk [OR = 3.505 (CI) = 1,688-7,279, Wald = 11,319, p = 0.001].
Conclusion
Our data found the use of soy was associated with CPP. Additionally, EBF was pointed as a protective factor. However, future prospective studies are needed to clarify this issue.
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