My brain fog can improve or worsen in seconds. I think there is some kind of dynamic process there. Lately I have had tiny improvement in fog, and substantive in energy, from Brazil nuts, high in poly omega-6 fats and selenium. Its why I have been writing more prolifically the last week. I occasionally took one instead of a selenium supplement or for essential fat deficiency symptoms, but something I have discovered this year is a threshold effect. Eating seven Brazil nuts all at once. once a week, has a more powerful effect than eating one a day. I see something similar with resveratrol. PS It doesn't help with spelling or typos though, I still need to edit my posts.