Why nitrate source may matter for brain healthDietary nitrate intake comes from several sources. Overall, these suggest a potential link between nitrate intake and dementia risk. In the highest quintile of vegetable-sourced, but not total plant-sourced, nitrate intake, early-onset dementia risk decreased by 39 %. Conversely, with higher polyphenol or vitamin C intake, nitrate intake was no longer linked to a lower dementia risk. Nitrate source matters more than nitrate amountThe findings reveal source-dependent differences in the associations of nitrate and nitrite with dementia.