A cohort of 4,146 pregnant Dutch women was asked about their frequency of consumption of fruit, vegetables, fish, egg, milk, milk products, nuts, and nut products during the preceding month. The children’s diets were assessed at age two years, and their asthma and allergy status was assessed yearly until eight years of age. Daily consumption of nut products by mothers during pregnancy was found to increase the risk of their children developing asthma symptoms by more than 50%, compared with women who rarely consumed nut products during pregnancy. (Maternal food consumption during pregnancy and the longitudinal development of childhood asthma. Am J Respir Crit Care Med. 2008 Jul 15;178(2):124-31).

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