Objective: To examine the association between breast-feeding and blood pressure, anthropometry and plasma lipid profile in both adolescence and young adulthood. Design: Longitudinal study of biological and behavioural risk factors for CVD. Setting: The Young Hearts Project, Northern Ireland. Subjects: Schoolchildren aged 12 years and 15 years who participated in a crosssectional study of lifestyle and health, and who were followed up as young adults aged 20-25 years. Results: There was no significant difference in height, weight, BMI, skinfold thickness measurements, blood pressure or plasma lipid profile in adolescents who had been breast-fed compared with those who had not been breast-fed. However, by the time these adolescents had reached adulthood, those who had been breast-fed were significantly taller than those who had not been breast-fed (standing height, P 5 0?013; leg length, P 5 0?035). Specifically, the breast-fed group was on average taller by 1?7 cm (95 % CI 0?4, 3?0 cm) and had longer legs by 1?0 cm (95 % CI 0?1, 1?9 cm). There was no significant difference in other anthropometric measures, blood pressure or plasma lipid profile in adults who had been breast-fed compared with those who had not been breast-fed. Conclusions: Compared with those who had not been breast-fed, individuals who had been breast-fed were taller in adulthood. Given the known association of increased adult height with improved life expectancy, the results from the present study support a beneficial effect of breast-feeding.
KeywordsBreast-feeding Cardiovascular risk factors Anthropometry Adolescence AdulthoodOnly 35 % of UK babies are being exclusively breast-fed at 1 week, 21 % at 6 weeks, 7 % at 4 months and 3 % at 5 months (1) , despite WHO recommendations that infants should be fed breast milk exclusively for the first six months of life (2) . Although it is widely accepted that breast-feeding has numerous health benefits for both the infant and mother (3,4) , controversy remains over the benefits of breast-feeding on the incidence of adult CVD (5) and, in particular, CVD mortality (6)(7)(8) . Increasing evidence suggests that breast-feeding is associated with lower CVD risk factors such as serum total cholesterol (TC) and LDL cholesterol (LDL-C) (9)(10)(11) ; however, the effect of breast-feeding is not clear for all known risk factors, including BMI and blood pressure (12)(13)(14)(15) . Evidence suggests that breast-feeding in infancy may have a small effect on BMI in adolescence and adult life (12) . Breast-feeding is also associated with lower levels of TC and LDL-C in adulthood (6,9) . The magnitude of the effect of breast-feeding on blood pressure remains uncertain, and concerns have been expressed about the influence of publication bias and confounding on this relationship (13,14,16) . Little is known about the effect of breast-feeding on height in adolescence and adulthood; however, emerging evidence points to a potential association with increased stature (17,18) . Several recent studies have assessed the...