Diet or exercise, or both, for weight reduction in women after childbirth.

Background: Weight retention after pregnancy may contribute to obesity. It is known that diet and exercise are recommended components of any weight loss programme in the general population. However, strategies to achieve healthy body weight among postpartum women have not been adequately evaluated.

Sensitivity and specificity of classification systems for fatness in adolescents.

Background: Various body mass index (BMI) standards have been proposed for defining overweight in adolescence, but few studies have evaluated their diagnostic accuracy.

Objective: We compared the sensitivity and specificity of BMI-based classification systems for detecting excess fatness in adolescents.

Design: A cross-sectional analysis of 474 adolescents aged 17 y was used.