Avoid Dairy Products When You Have a Cold
This is such a common myth that a number of scientific studies have been done to test this. The myth is that dairy products have been thought to promote mucus production, and thus should be avoided with colds and other upper respiratory problems, including asthma. There is no consistent effect of dairy products on mucus production. It cannot be demonstrated that this is a problem. If you feel that you are affected, then don't do it, but don't avoid needlessly. It is possible to have this sensation, since milk can have a filmy residue in the mouth after drinking, but this has nothing to do with mucus.