“…This decrease is usually ascribed to improvements in health, nutrition, and environmental conditions (de Muinck Keizer‐Schrama and Mul, ), and there is evidence that this decline has now begun to stabilize (Coleman and Coleman, ; Dorn and Biro, ). Thomas et al () argue that variability in the age at menarche is largely determined by extrinsic factors, and studies have consistently shown a link between poor nutritional status and a delay in menarche regardless of the child's ancestry or climate (Gluckman and Hanson, ; Goyal et al, ; Karapanou and Papadimitriou, ; Zacharias and Wurtman, ). In addition, acute and chronic illness and accumulated childhood hardships (e.g., poverty, poor nutrition, exposure to alcoholism or tobacco smoke, physical neglect, death of a parent) delay menarche as a stress response (Boynton‐Jarrett and Harville, ; Dossus et al, ; Karapanou and Papadimitriou, ).…”