I've noticed that my 'first' brain acts faster and better if my 'second' brain is feeling good. Probiotic foods, plenty of water and movement have been key factors there.
what kind of probiotic foods have you successfully included in your daily life?
Greek yogurt with active cultures and sour milk with lactobacillus acidophilus and bifidobacterium lactis. Unripened bananas.
Some whole grains; rye and sourdough breads, whole grain oats.
I also stay away from fast food or anything deep fried, avoid most processed foods and rather do home cooked meals each day.
This isn't probiotic, but I've noticed that my system is much happier with fish than red meat. So there is plenty of that each week.