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ORIGINAL RESEARCH COMMUNICATION |
1 From the Department of Social Medicine, University of Bristol, Bristol, United Kingdom (RMM, AM, GDS, and YB-S), and the Department of Child Health, University of Wales College of Medicine, Cardiff, United Kingdom (DPD).
Background: Evidence suggests that environmental factors acting early in life may affect blood pressure in adulthood.
Objective: The objective was to test the hypothesis that dried formula milk (derived from cow milk) intake in infancy is positively associated with blood pressure in early adulthood.
Design: We conducted a long-term follow-up (19971999) of the Barry Caerphilly Growth study cohort (19721974) into which mothers and their offspring had originally been randomly assigned to receive a milk supplement or usual care. Participants were the offspring, who were aged 2327 y at follow-up. The main outcome measures were systolic and diastolic blood pressure.
Results: The social and demographic characteristics of the subjects who were (n = 679) and were not (n = 272) followed up were similar. For each increase in quartile of dried milk consumption (in oz) at 3 mo of age, there was a 1.28-mm Hg (95% CI: 0.46, 2.10 mm Hg) increase in systolic and a 0.63-mm Hg (95% CI: 0.04, 1.22 mm Hg) increase in diastolic blood pressure after adjustment for sex, intervention group, birth weight z scores, social class in childhood, age at follow-up, alcohol consumption, and pack-years of smoking. These coefficients were attenuated when adult body mass index and height were included in the models, but the association of dried milk consumption at 3 mo of age with systolic pressure remained significant (1.07 mm Hg; 95% CI: 0.27, 1.87 mm Hg).
Conclusions: Our findings are consistent with the hypothesis that high blood pressure in later life is influenced by early postnatal nutrition. Thus, interventions to optimize infant nutrition may have important long-term health benefits.
Key Words: Infant nutrition formula feeding blood pressure hypertension cardiovascular disease cohort studies
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