Is my afternoon brain fog something I can actually fix?
The short answer
Often yes - much of the classic 3pm fog traces to how your body absorbs B12 and iron and how deeply you sleep, all of which have a strong genetic component.Three common variants stack up here. MTHFR can blunt B12 activation. TMPRSS6 can lower iron uptake. PER3 can shorten the deep-sleep phases that should clear your head overnight. Any one alone is mild. Together they read as a foggy afternoon.
The reason generic advice misses it is that each piece looks normal on a standard report. The pattern only shows up when you look at how your particular body handles these nutrients.
Do this today
Track your energy at 3pm for five days alongside what you ate and how you slept. Patterns you can see are patterns you can change.
Genes in playMTHFRTMPRSS6PER3