Note that aflatoxins are also found as a common contaminant in maize, so this is another source of these aflatoxins.
Yes, this is quite true. Certain foods are contaminated with mycotoxins, and for people who cannot detoxify them properly, this can be a real problem.
(Whether there are enough mycotoxins in foods to be problematic for healthy people who have not become sensitized to them, I'm not sure. I've heard that a number of years ago, the government vastly increased the amount of aflatoxin allowed in peanuts -- possibly leading to an increase in peanut allergies as a result -- and so it seems to be just another one of those things where our whole food supply has gone to crap.)
Note that the trichothocene-producing fungus Fusarium has been shown to grow in great quantities in the presence of the herbicide Roundup (used on Roundup Ready corn, soybeans, sorghum, canola and sugar beet). Thus, the non-organic versions of all of those products should be assumed to possibly be contaminated with trichothocenes. And since trichothocenes cannot easily be washed off and are stable until 500+ degrees F, this includes things such as soft drinks and spirits made with these ingredients as well.
The popular blog "Bulletproof Executive" has at the base of its diet recommendations the importance of avoiding mycotoxins. (The author also suggests avoidance of moldy buildings.) Foods that are generally recognized as frequently being contaminated with one form of mycotoxin or another, and that he suggests that people avoid, include:
* Grains of all sorts. (Soaking the grain or removing the husk -- as happens with white rice -- may be helpful in getting rid of some of the toxins.)
* Most nuts. (Peanuts and cashews tend to have particularly large amounts of aspergillus contamination, but other nuts can be contaminated too. Soaking/sprouting nuts and then discarding the water prior to eating can be helpful.)
* Chocolate and coffee. (The blog author sells what he claims are low-mold, "upgraded" versions of these.)
* Non-organic meat, dairy and eggs. (When animals eat mycotoxin-contaminated feed, the mycotoxins do not vanish into thin air. They are stored in their tissues/fat and come out in their eggs and milk. The blog author is especially enthusiastic about the concept of "grassfed," with the feed being fresh rather than moldy. Grassfed does have other benefits too, of course.)
If this sounds like avoiding these foods would lead people to the "GAPS" diet or to a "Paleo" diet -- diets that many CFS sufferers have said are helpful for them -- then you're thinking in the right direction. Maybe these diets are helpful not because of the avoidance of certain foods themselves, but because of the avoidance of mycotoxins commonly contaminating those foods? (Note there are a bunch of agricultural studies showing that trichothocenes can cause intestinal permeability in animals.)
http://www.bulletproofexec.com/how-your-house-can-make-you-weak/
http://www.bulletproofexec.com/remove-toxins/
http://www.bulletproofexec.com/mycotoxins-in-america/