I am a 35 year old male and I have the exact same problem. After eating greasy food like things sauteed in butter or pizza, I will "burp" up large quantities of pure, crystal clear, orange grease. Nothing else, just grease that looks exactly like the stuff that pools on top of a pepperoni pizza. I, however, am not a healthy weight. I weigh in around 325 and have type 2 diabetes and high blood pressure. Here is the kicker thought, My cholesterol is PERFECT. Bad is non existent and good is right where it should be. It's like my body has a filter on it and after the food has passed, the "bad" grease comes back up.
I have the same problem. I wish someone would comment. I've been taking Nexium for years, and it doesn't help. You could try Gaviscon, but I still don't think that works. It's been 4 years, and I'm still suffering. I even had my gallbladder removed, but to no avail. Have you checked for any food allergies? That's my next stop.