推荐回答（2个）
经常感冒是自身抵抗力（免疫力）低下的反映，一般性感冒大多是由鼻病毒引起的，鼻病毒正常寄生在人的鼻腔内，经常清洁鼻腔是个好办法，也可以经常用冷水洗鼻腔，可以预防感冒。破壁灵芝孢子粉，也能够提高人体免疫力，对老年患者特别合适。 灵芝片泡水喝，很好，可以使用。
1、清淡的汤和粥
感冒时，人的肠胃功能变差，清淡的粥和汤相对易消化，同时热汤和热粥可以起到发汗的作用，但发汗之后要注意水分的补充。
2、红薯
增强皮肤抵抗力。皮肤也是人体免疫系统的一员，是人体抵抗细菌、病毒等外界侵害的第一道屏障。维生素A在结缔皮肤组织过程中起重要作用。而补充维生素A最好的办法就是从食物中获取β胡萝卜素，红薯是获得这种营养的最快途径，它含有丰富的β胡萝卜素，且热量低。
3、萝卜
萝卜中的萝卜素对预防感冒及缓解感冒时痰多等症状可能有一定作用。推荐一种做法：把萝卜切碎，榨汁，再把生姜捣碎，榨出少量姜汁，加入萝卜汁中，拌匀后冲入温开水做成饮料喝。
4、大蒜
大蒜素抗感染和细菌。英国研究人员的实验结果表明，食用大蒜可让感冒发生几率降低2/3。经常咀嚼大蒜的人患结肠癌和胃癌的几率也会大大降低。因此，建议每天生吃两瓣蒜，并在烹饪菜肴时加入一些大蒜末。
5、蜂蜜
其中含有多种生物活性物质，能激发人体的免疫功能，每日早晚两次服用，可增强身体免疫力，抵抗病毒侵袭。
6、柳丁与橘子
柑橘类水果内含的维它命C是第一要推荐，因为增加体内制造对抗感染的白血球与抗体，也增加干扰素，预防病毒入侵人体。
大多数维生素C含量丰富的食物也含有生物类黄酮，是很重要的抗氧化、抗发炎的化学物质，它与C加起来一起有助提升免疫力。
7、优酪乳
每天吃一碗含有“活的益生菌”的优酪乳，可以刺激免疫系统对抗疾病，而且最新的发现，优格与日照里含有的维生素D，在减少感冒或流感的功能上，仅次于注射疫苗。
8、杏仁果
含有锌，促进体内产生白血球以对抗感染。比较安全的锌可从食物里获取，一天吃到15～25克就够了，吃太多(超过75克)反而会抑制免疫功能。
9、蘑菇
能促进白血球抗感染。长久以来，人们就把蘑菇当作提高免疫力的食物。现在，研究人员们找到了这样做的理由：吃蘑菇可以促进白血球的产生和活动，让它们更具防范性。
10、西兰花
这是绝佳的增强免疫力的食物，饱含维生素A、C与榖胱甘抗氧化剂。
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