There is no consistent result in the relationship between obesity and timing of pubertal onset in boys .
Obesity may contribute to early onset of puberty in girls , while in boys , there is insufficient data .
This systematic review and meta- analysis examined the associations between obesity and puberty timing based on scientific evidence .
Association between age at menarche and risk of diabetes in adults: results from the EPIC-Norfolk cohort study
Aims /hypothesisEarlier age at menarche is associated with increased BMI and obesity risk from early childhood through to adulthood . We hypothesised that earlier age at menarche would also predict subsequent diabetes risk . Methods This was a population -based prospect i ve cohort study of 13,308 women , who were aged 40 to 75 years between 1993 and 1997 and participating in the Norfolk cohort of the European Prospect i ve Investigation into Cancer and Nutrition ( EPIC-Norfolk ) . We used data on age at menarche and ascertained diabetes incidence to 2005 . Results There were 734 cases of diabetes ( 363 incident and 371 prevalent cases ) . Mean age at menarche was lower in women with diabetes than in non-diabetic women ( 12.8 vs 13.0 years , p = 0.008 ) . Compared with the earliest quintile ( menarche at 8–11 years ) , women in the oldest quintile ( menarche at 15–18 years ) had lower BMI ( 25.5 vs 27.4 kg/m2 , p < 0.0001 ) and a reduced risk of diabetes ( OR 0.66 [ 95 % CI 0.51–0.86 ] adjusted for age , family history , physical activity , smoking , occupational social class , parity and use of hormonal preparations ) . The association between age at menarche and diabetes was linear ( adjusted OR 0.91 [ 95 % CI 0.87–0.96 ] per 1 year later menarche ) and appeared to be completely mediated by adult BMI or waist circumference ( OR 0.98 [ 95 % CI 0.93–1.03 ] , further adjusted for BMI at age 40–75 years ) . Conclusions /interpretationEarlier age at menarche increases the risk of diabetes in women and this association appears to be mediated by increased adiposity . History of earlier menarche may help to identify women with increased subsequent risk of diabetes
There is no consistent result in the relationship between obesity and timing of pubertal onset in boys .
Obesity may contribute to early onset of puberty in girls , while in boys , there is insufficient data .
This systematic review and meta- analysis examined the associations between obesity and puberty timing based on scientific evidence .