我听说感冒时不应该喝牛奶，因为会增加痰。请问是这样吗？
回答 Julie Baughn, M.D.
否。喝牛奶不会使身体产生痰液。
痰是肺部和上呼吸道产生的黏稠黏液。感冒时，鼻子和咽喉里的黏液会更黏稠。黏液中含有被粘住的细菌以及免疫系统派出去清除细菌的蛋白质和细胞。
有关牛奶与黏液的研究并不多。但我们的研究表明，我们的感知可能助长人们相信牛奶会引起更多的黏液。
1948 年，约 600 名患者接受了有关黏液和牛奶的调查；其中大多数人是因为眼睛问题就医。医务人员对抱怨黏液较多的患者进行了黏液检测。有些患者喝牛奶，有些患者不喝。结论是牛奶并不会导致黏液增多。
最近的研究表明，牛奶可能会对感官产生影响，致使一些人认为牛奶会引起咳痰。当牛奶和唾液在口腔中混合时，会产生一种略显黏稠的液体，短暂地覆盖口腔和咽喉。这种挥之不去的感觉可能被误认为是黏液增多。
哮喘是一个研究较多的领域。
过去的研究表明，患有哮喘的儿童常常不喝牛奶，因为人们认为牛奶会导致痰液增多。但一项小型研究发现，患有哮喘的儿童无论是喝牛奶还是豆浆，症状并无差异。
无需停止喝牛奶的理由
一杯冷牛奶或几口冷冻酸奶有助于缓解咽喉疼痛。此外，牛奶还可以帮助您在生病等不想进食的时候补充营养和热量。
显示参考文献
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Original article: https://www.mayoclinic.org/zh-hans/diseases-conditions/common-cold/expert-answers/phlegm/faq-20058015