This was totally wrong. I believe this contributed to the pneumonia that I had. I started to see my sinuses fill up with the same kind of stuff that I had within my CF lungs. After being hospitalized, I decided it was not worth consuming dairy products any more. I started to eat soy products.
Soy can be an allergenic food for some people.
If you like soy, read the labels and avoid soy products that contain the ingredients casein, caseinate or lactose all of which are actually derived from dairy components and can also cause excessive mucus buildup. These ingredients are found in most soy cheeses, so it is essential to read the ingredients on the labels. Also, try to keep up the same physiotherapy regime to see if you feel better. To conduct any experiment, we need to keep up the same routine for a number of weeks, so that we can prove to ourselves the changes that will have taken place. If we cheat just one time, this may set us back several days and we will never know for sure what caused the feeling of excess congestion.