Discomfort temporarily disappears when these foods are eaten again, producing more feel-good endorphins. It's addiction, not true hunger. Abstinence from addictive foods is necessary to break the cycle. Alcohol plus allergens however, hit the nervous system with a double hammer of toxicity. Alcohol may exhilarate this person at first, but often they lose control and drink until drunk.
Hangovers usually follow.
Withdrawal brings confusion, depression and anxiety. It enables them to convert alcohol to acetaldehyde with super speed. Their ancestors are predominately northern European. Even as teenagers, their first drinking experience was pleasant-alcohol didn't make them sick. They can handle a lot of alcohol without getting drunk, never get hangovers, and feel revved-up, rather than sedated by alcohol.