The problem struck me recently. Personally I'm not allergic/intolerant to anything, and I'm very grateful of that now that I'm in my 30's. But the wife of a colleague of mine recently got hired and she's quite allergic to nuts and other shell fruit.
I knew about her for quite some time but now that I have to spend much more time in proximity I took the commitment to learn how to live with people with such allergies and not mess up their health because I wasn't careful enough.
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