WI: Many humans developed an allergy to nuts

Nowadays a small percentage of people are allergic to certain nuts or legumes. This allergy seems to be on the rise, or perhaps was underreported in previous years. Let's say that from a paleontological perspective some early humans developed an intolerance to certain nuts and legumes. This intolerance would be similar to the nut allergies seen in some people today. How would this affect "history". By 'history' I mean the recorded obserations of humanity, from sumerian clay tablets to usenet.

Some tangents: Would all human populations develop this food allergy? How would this affect agriculture? Would there be protein deficiency issues in certain human populations? Would certain species of nuts or legumes change or disappear due to lack of human cultivation or consumption? Would humans develop an instinctual fear of nuts and legumes? Would the inability of certain persons to digest these foods change the course of wars or nation building?
 
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Nuts is a fairly unimportant issue. They were a desireable food, but for most of human history they were a luxury food more than a staple. I can't think of a single population that depended on nuts to survive past the hunter-gatherer stage. In Europe, walnuts, hazelnuts and almonds would be considered prime forage and we'd see delicious pigs or calves fed on them.

Legumes, though - ouch. That pretty much kills the Sinosphere and the Mediterranean, India and the ancient Orient. And Precolumbiam America, if you include phaseolus (I haven't heard of anyone with a phaseolus allergy, but I haven't searched, either). Intensive agriculture just became a lot less desireable. Much more animal husbandry in the prime areas, and civilisation may have to cling more strongly to rivers and coasts for the protein fisheries can provide.
 
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