Abstract
BACKGROUND: To prospectively assess the individual and joint effects of birth weight and the life's essential 8 (LE8)-defined cardiovascular health (CVH) on myocardial infarction (MI) risk in later life. METHODS: In 144,803 baseline MI-free participants who were recruited in the UK Biobank cohort between 2006 and 2010, Cox proportional hazard models were used to estimate the associations of birth weight, LE8 score, and their interactions with incident MI. LE8 was defined on the basis of diet, physical activity, nicotine exposure, sleep health, body mass index, blood pressure, blood glucose, and blood lipids. RESULTS: Low birth weight was associated with higher risk of MI [hazard ratio (HR) 1.17, 95% confidence interval 1.02-1.35, P = 0.025], while no significant correlation between high birth weight and MI was observed after adjustment. Low CVH was associated with higher MI risk [HR 6.43 (3.71-11.15), P < 0.001). Participants with low birth weight and low CVH (vs. participants with normal birth weight and high CVH) had HR of 5.97 (2.94-12.14) for MI incidence. The relative excess risk due to interaction of low birth weight and low CVH on MI was -4.11 (-8.12, -0.11), indicating a negative interaction on an additive scale. A consistent decreasing trend of MI risk along with increased LE8 score was observed across all three birth weight groups. CONCLUSION: Low birth weight was associated with increased MI risk, emphasizing the importance of the prenatal factor in risk prediction and prevention of MI. Improving LE8 can mitigate MI risk attributed to low birth weight.