A healthy diet reduces risk for high blood pressure. A small body size at birth increases risk for high blood pressure. Our aim was to study whether birth weight modifies the association between a healthy Nordic diet, characterized by high intake of Nordic vegetables, fruits, and berries, whole-grain rye, oat, and barley, and rapeseed oil, and blood pressure. Finnish men and women (n = 960) born in 1934–1944 attended clinical visits including clinical measurements, and questionnaires in 2001–2004 and 2011–2013. Linear regression was applied to investigate the interactions between birth weight and Nordic diet (measured by the Baltic sea diet score (BSDS)) on blood pressure change during the 10-year follow-up. Baseline Nordic diet and birth weight showed a significant interaction on systolic blood pressure (SBP) (p = 0.02), and pulse pressure (PP) (p < 0.01) over a 10-year follow-up. In the lowest birth weight category (women < 2951 g, men < 3061 g), predicted SBP decreased across BSDS thirds (lowest (T1): 155 mmHg, highest (T3): 145 mmHg, p for linearity = 0.01) as did predicted PP (T1: 71 mmHg, T3: 63 mmHg, p < 0.01). In the middle birth weight category, predicted SBP increased across BSDS thirds (T1: 151 mmHg, T3: 155 mmHg, p = 0.02) as did predicted PP (T1: 67 mmHg, T3: 71 mmHg, p < 0.01). In the highest birth weight category, no associations were found. Higher adherence to a healthy Nordic diet was associated with lower SBP and PP in individuals with low birth weight but with higher SBP and PP in those with average birth weight.
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This study was supported by grants from Finska Läkaresällskapet, the Finnish Special Governmental Subsidy for Health Sciences, Academy of Finland (127437, 129306, 130326, 134791, 263924, and 315690), Samfundet Folkhälsan, Liv och Hälsa, EU FP7 [Developmental Origins of Healthy Aging (DORIAN)] project number 278603, and EU H2020-PHC-2014-DynaHealth grant 633595, Horizon2020 award No. 733206 LifeCycle. (all for the Helsinki Birth Cohort Study), European Commission, Horizon2020 award 733280 RECAP), Foundation for Cardiovascular Research, Foundation for Diabetes Research, Foundation for Pediatric Research, Novo Nordisk Foundation, Signe and Ane Gyllenberg Foundation, Sigrid Jusélius Foundation.
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Supplemental Table S1. Coefficient, 95% CI, and p-values for missingness of use of blood pressure affecting medication data at follow-up (2011-2013) (0=data not missing/1=data missing) by one unit increase in a given variable (n=955).
Supplemental Table S2. Coefficient, 95% CI, and p-values for missingness of maternal pre-delivery BMI data (1=missing data/0=data not missing) by one unit increase of a given variable (n=955).
Supplemental Figure S3. Proportions of observed (n=823), imputed (n=137), and completed (n=960) values of blood pressure affecting medication use at follow-up (0 = data not missing, 1 = data missing) in each 10 imputed datasets. Multiple imputation (10 imputations) with logistic regression model included covariates age, sex, educational attainment, gestational age, smoking, leisure-time physical activity, BMI, weight change during follow-up, energy intake, Baltic sea diet score, sodium intake, use of blood-pressure affecting medication at baseline, household income, systolic blood pressure at baseline and at follow-up, diastolic blood pressure at baseline and at follow-up, and maternal pre-pregnancy BMI.
Supplemental Figure S4. Proportions of observed (n=842), imputed (n=137), and completed (n=960) values of maternal pre-delivery BMI (0 = data not missing, 1 = data missing) in each 10 imputed datasets. Multiple imputations (10 imputations) with regression model included covariates age, sex, educational attainment, gestational age, smoking, leisure-time physical activity, BMI, weight change during follow-up, energy intake, Baltic sea diet score, sodium intake, use of blood-pressure affecting medication at baseline, household income, systolic blood pressure at baseline and at follow-up, diastolic blood pressure at baseline and at follow-up, and blood pressure affecting medication use during follow-up.
Supplemental Table S5. F-values (df1, df2) and p-values for interaction between birth weight and Baltic sea diet score on blood pressure parameters at baseline (2001-2003).
Supplemental Table S6. Association between baseline BSDS and blood pressure parameters at follow-up by BW in observed cases and completed cases (multiple imputation). F-values (f1, df2) and p-values for interaction term (BW x BSDS) on blood pressure parameters and predicted blood pressure parameters in thirds of Baltic sea diet score by birth weight.
Supplemental Table S7. Regression coefficients and their 95 % confidence intervals for the association between BSDS components at baseline and systolic blood pressure and pulse pressure in 10-year follow-up.
Supplemental Figure S8. Linear predictions of systolic blood pressure across birth weight deciles in thirds of the Baltic sea diet score. BSDS, Baltic sea diet score.
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Meinilä, J., Perälä, MM., Kanerva, N. et al. Birth weight modifies the association between a healthy Nordic diet and office blood pressure in old age. J Hum Hypertens 35, 849–858 (2021). https://doi.org/10.1038/s41371-020-00423-1