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Early nutritional origins of hypertension: a hypothesis still lacking support
1Department of Pediatrics and Human Development, College of Human Medicine, Michigan State University, East Lansing 48824, USA.
Insights
Prenatal nutrition limitations and low birthweight are not strongly linked to higher adult blood pressure. Evidence does not support this hypothesis as a major determinant of hypertension in industrialized nations.
Area of Science:
- Epidemiology
- Public Health
- Nutritional Science
Background:
- A hypothesis suggests prenatal nutrition, indicated by birthweight, influences adult blood pressure.
- This hypothesis is commonly cited in discussions of developmental origins of health and disease.
Purpose of the Study:
- To critically evaluate the hypothesis linking prenatal nutrition and birthweight to adult blood pressure.
- To assess the supporting evidence using established epidemiological causal criteria.
Main Methods:
- Evaluation of existing studies on birthweight and blood pressure.
- Application of causal criteria: specificity, consistency, strength, and biological coherence.
- Examination of methodological limitations in relevant research.
Main Results:
- Studies exhibit high attrition rates and methodological flaws.
- The association between birthweight and blood pressure is inconsistent and weak.
- Confounding factors like social class are often not adequately addressed.
- Human nutrition studies, including famine and supplementation, do not support the link in industrialized countries.
Conclusions:
- Current evidence does not support prenatal nutrition as a primary determinant of adult blood pressure.
- Methodological weaknesses and inconsistent findings undermine the proposed hypothesis.
Purpose:
It has been hypothesized that limitations in 'a baby's nourishment before birth', as reflected in reductions in birthweight and other newborn anthropometric measurements, are associated with subsequent elevations in blood pressure. We assess this hypothesis in light of four causal criteria commonly used by epidemiologists: specificity, consistency, strength and biological coherence. We also examine aspects of the methodology used in studies of this hypothesis.
Methodologic Problems:
Two major data sources for testing the hypothesis in Hertfordshire and Preston are flawed by very high attrition. The practice of testing this hypothesis by controlling for adult weight in the analysis overstates the benefit that might accrue from interventions to increase birthweight.
Causal Criteria:
Studies used to support the hypothesis examine a wide variety of exposures and outcomes, without prespecification of which associations are expected. The inverse relationship of birthweight to blood pressure is found inconsistently and, when present, is not strong. Potential confounding variables, especially social class, have not generally been taken into account. Evidence from human nutrition studies, especially of famine exposure and pregnancy nutrition supplementation, are not supportive of the proposition that in industrialized countries variations in the birthweight of the population closely reflect pregnancy nutrition.
Conclusion:
When examined critically, the evidence thus far provided does not support the hypothesis that prenatal nutrition is a major determinant of adult blood pressure.