National Diet and Nutrition Survey data reveal a decline in folate status in the UK population between 2008 and 2019.

These data reveal a decline in population folate status in the UK between 2008 and 2019 and, a high prevalence of folate deficiency. A high proportion of FRA had RBC folate concentrations below the cut-off for increased risk of NTD. These data provide information on folate status in a population not currently exposed to mandatory folic acid fortification, and are essential to model and assess its impact.