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  • Title: Relationship Between being Overweight and Iron Deficiency in Adolescents.
    Author: Huang YF, Tok TS, Lu CL, Ko HC, Chen MY, Chen SC.
    Journal: Pediatr Neonatol; 2015 Dec; 56(6):386-92. PubMed ID: 25987352.
    Abstract:
    OBJECTIVE: Being overweight has been considered to be a risk factor of iron deficiency (ID). The objective of this study was to examine the relationship between being overweight and body iron status among Taiwanese adolescents. METHODS: A total of 2099 adolescents (1327 female) aged 12-19 years from four middle schools and one college in southern Taiwan participated in this study. Data on sex, age, body weight, height, hemoglobin concentration, plasma ferritin (PF), and serum iron (SI) levels were collected. According to the age- and sex-specific body mass index (BMI) percentiles, the participants were divided into four weight groups: underweight (<5(th) percentile), normal weight (5-84(th) percentile), overweight (85-94(th) percentile), and obese (≥95(th) percentile). A multivariate logistic regression model was used to estimate the odds ratio (OR) and the 95% confidence interval (CI) for each factor. RESULTS: The correlation coefficients of linear regression were positive for BMI-hemoglobin and BMI-PF, but negative for BMI-SI. Compared with the normal-weight group, the obese group had a lower risk of PF level <15 μg/L with an OR (95% CI) of 0.51 (0.30-0.87) but a higher risk of SI <60 μg/dL with an OR (95% CI) of 1.78 (1.34-2.37). The percentages of low PF declined as BMI increased, but the percentages of low SI rose, from underweight to obesity groups. CONCLUSION: The relationship between being overweight and depleted iron store depends on which indicator is used to define the iron deficiency. Being overweight or obese would not be a risk factor of ID in adolescents, if ID were defined by PF rather than SI level.
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