A bit more relevant to the topic, Chia has published another paper on the subject. http://file.scirp.org/pdf/OJGas_2015040916050357.pdf
The early fullness you describe is a symptom of dyspepsia.
Dr. Klimas has also published a small study on this which shows enterovirus might also be a cause of gastroparesis which can cause similar symptoms. https://link.springer.com/article/10.1007/s10620-016-4227-x