I understand that drinking milk or eating yogurt will make a cold worse because the dairy increases the amount of mucus you make. I have a cold and wonder if I should stop drinking milk?
This is a myth. The amount of mucus generated by having a head cold or sinus condition is directly related to the virus or infection and not to dairy products. Researchers in Australia measured the mucus produced by people who had colds. The researchers then had them drink milk and measured their mucus output again. There was no difference in mucus production before or after ingesting the milk. While it may feel thicker inside your mouth when you eat dairy products with a cold, it is actually an illusion due to the lack of hydration in your mouth. Go ahead and enjoy dairy products when you have a cold and be sure to drink plenty of fluids to keep hydrated.