May 14, 2007

Balancing Benefits against Risks – A Classic Nutrition Dilemma

A longitudinal study in the US to assess the possible benefits and hazards to a child's development of different levels of maternal seafood intake during pregnancy found maternal seafood intake during pregnancy of less than 340 g per week was associated with increased risk of lower scores for verbal intelligence, pro-social behaviour, fine motor skills, communication, and social development. Beneficial effects on child development were recorded with maternal seafood intakes of more than 340 g per week. In the USA, women are advised to limit their seafood intake during pregnancy to 340 g per week because of concerns over mercury intake and its impact on embryo neurology. However, seafood is the predominant source of omega-3 fatty acids in the US diet, which are essential for optimum neural development. This study indicates that current advice should be reviewed carefully, because limiting seafood consumption could on balance actually be detrimental. The research also underlines the importance of conducting full risk-benefit analysis, to ensure that health advice and policy is based on evaluation of all the evidence. For more information see Hibbeln et al (2007); Lancet 369:578-585 Maternal seafood consumption in pregnancy and neurodevelopmental outcomes in childhood (ALSPAC study): an observational cohort study. DOI:10.1016/S0140-6736(07)60277-3