这些东东网上一大堆，给你找了几个。也回敬过小问题，就说酒精过敏吧，你能否让他们今后接触酒精后不过敏？

http://baike.baidu.com/view/921216.htm

http://en.wikipedia.org/wiki/Wheat_allergy

http://www.centerforfoodallergies.com/milk_allergies.htm
What Causes a Milk Allergy?
Most likely it is a genetic condition. In the big picture, humans have only recently introduced cow’s milk into the diet, so it’s not surprising that the immune system doesn’t always recognize it as a friendly substance.

https://en.wikipedia.org/wiki/Food_allergy