I don't have that answer for you, but I can tell you I go through the same thing. Especially the fullness. Physically also, as the day wears on my abdomen gets bigger and bigger. Then after I awake the next morning it goes down to just about normal. I don't get alot of nausea. I do get it but not as much as I used to before I went to low fat foods. Hopefully someone can explain this fullness/nausea. I would be interested in eharing the answer myself.