Original article: "Source-specific nitrate intake and incident dementia in the Danish Diet, Cancer and Health Study" - https://alz-journals.onlinelibrary.wiley.com/doi/10.1002/alz...
"RESULTS. Higher plant-sourced nitrate intake was non-linearly associated with lower rates of incident dementia (fifth vs first quintile hazard ratio 95% confidence interval: 0.90 [0.83, 0.98]), while increased risk was seen for higher intakes of animal-sourced, additive-permitted meat-sourced, and tap water-sourced nitrate. Similar associations were seen for source-specific nitrite intake and were more pronounced for early-onset dementia. No clear effect modification was observed."