Others have suggested that nitrate or the reduced form (nitrite) may pass to the fetus through a system of active transport similar to that of iodide, and fetal nitrate plasma levels may exceed that of the mother (Hartman 1982).

A review of nitrates in drinking water: maternal exposure and adverse ... by Moll, Deborah M. / Environmental Health Perspectives

Interestingly, from a separate questionnaire sent home for parents to complete, the majority of parents (77%) stated they either walked or cycled to school themselves as 10-year-olds, indicating a substantial decrease in active transport in only one generation.

Barriers to physical activity in young New Zealanders by Ross, Jenny J. / Youth Studies Australia

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