Yes, food allergies = natural adverse reaction to natural foods (rash from example).
From your quackjob professor's powerpoint,
http://potency.berkeley.edu/MOE.html
Then she goes on to list in green:
coffee, beer, toast, mushrooms, celery, french fries, bacon, lettuce, bread and hamburger.
So basically, everything in the diet causes cancer. Awesome assessment!
If you're going to accept her "natural pesticides" theory then you may as well never drink coffee again because it has a > % tested positive:
Proportion Of Chemicals That Are Carcinogenic in High Dose Rodent Experiments
Chemicals tested in rats or mice 52% 786/1523
Natural pesticides 53% 43/81
Commercial pesticides 40% 82/206
Mold toxins 59% 16/27
Natural chemicals in roasted coffee 72% 23/32
/cuckoo /cuckoo
I seriously hope you don't believe this BS. If you do, then I hope you don't drink coffee or alcoholic beverages.