Not only that, it appears they may reduce cancer risk - A
http://well.blogs.nytimes.com/2011/07/18/really-the-claim-allergies-reduce-the-risk-of-cancer/?_r=1
Allergic reaction also causes an increase in neurogenesis, the growth and development of nervous tissue, which is known to decline with age. In individuals prone to allergies, would brain ageing progress differently than in those who are not allergic?
http://neurosciencenews.com/allergies-hippocampus-neuroscience-4797/
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