I have been battling what I believe to be candida, with brain fog being one of my main symptoms. I've noticed that after eating some brands of peanut butter, that the brain fog would kick in very noticably. However one brand never gives me any symptoms at all. Maranatha "Organic" peanut butter is guaranteed to not have any of the problem molds or micotoxins that grow on some peanuts and that are in some peanut butters. I suppose that the reason to not eat peanut butter is because of these molds. If this is the only reason, then this brand should be fine. If there are any other reasons that peanut butter should not be eaten, I'd like to know. I think the same problem exists with whole wheat bread. Many say to avoid this too, and I think it's because simular molds grow on it too. It's not the whole wheat, it's the mold.