Association between Dietary Patterns and Precocious Puberty in Children: A Population-Based Study

Objective. The aim of the present study was to investigate the association between dietary patterns and precocious puberty among Shanghai children. Methods. A cross-sectional study was conducted among Shanghai children by multistage stratified cluster random sampling in June 2014. Diet was assessed using a simplified food frequency questionnaire (FFQ). Height, weight, and Tanner stages of breast development, pubic hair growth, and testicular volume were carefully measured. Exploratory factor analysis was used to identify dietary patterns, and logistic regression analysis was used to assess the association between dietary patterns and precocious puberty. Results. Three distinct dietary patterns, "traditional diet," "unhealthy diet," and "protein diet," were established. Neither the "traditional diet" pattern nor the "protein diet" pattern showed any association with precocious puberty, taking gender, BMI, and adjustment factors into consideration. The "unhealthy diet" pattern was significantly positively associated with precocious puberty in both boys (OR = 1.24, 95% CI = 1.02-1.51) and girls (OR = 1.31, 95% CI = 1.10-1.56). The relationship remained positive only for girls (OR = 1.25, 95% CI = 1.04-1.49) after adjustment for age and BMI but statistically nonsignificant after further adjustment for socioeconomic factors in both boys and girls. Conclusions. Dietary patterns were found to be related to precocious puberty among Shanghai children.