Since a year I've been spitting phlegm out very often, especially in the morning after eating or drinking something. The food I eat is usually in the phlegm, even after an hour. It is more when I spit out the phlegm within ten minutes of eating. For example, when I drink milk in the morning, the phlegm is thick with the colour of boost/bourn vita. I rarely cough, occasionally sneeze and my nose is never runny unless I cry, but there is a little dry snot if it is picked. What could this be? The phlegm nowadays has more bubbles than yellow phlegm, and is mostly white or clear unless I've eaten.