There’s a strong link between the common cold sore (Herpes simplex virus type 1) and amyloid beta buildup in the brain, which accumulates and severely impacts cognition. It’s estimated that around 67% of the entire world’s population has HSV-1. When your immune system weakens and the virus activates and comes out of dormancy, your body starts to pump out these amyloids to “protect” itself against the virus. The issue is that high levels of this peptide buildup leads to Alzheimers like symptoms. Over time, if you have poor sleep hygiene or under a lot of stress, the buildup reaches a point of significant aggregation causing “brain fog,” even without a confirmed diagnosis of Alzheimers. This is just my theory though. I’m not a doctor. It’s just my 2 cents.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2953363/
https://www.tandfonline.com/doi/full/10.1586/14787210.2014.8...