“Individuals who had large numbers of the bacteria groups Neisseria and Haemophilus had better memory, attention, and ability to do complex tasks. These people also had higher levels of nitrite in their mouths.
On the other hand, greater levels of the bacteria, Porphyromonas, was more common in individuals with memory problems. Whereas the bacterial group Prevotella, was linked to low nitrite, which the researchers predict could in turn could mean poorer brain health and was more common in people who carry the Alzheimer’s Disease risk gene, APOE4.”
https://scitechdaily.com/scientists-discover-mouth-bacteria-linked-to-increased-alzheimers-risk/
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