An article was published online here: http://www.medpagetoday.com/MeetingCoverage/ACG/tb/6976 on October 15, 2007: ACG: Weight Gain with Infliximab in Crohn's Disease Confirmed but Not Explained
"Unexplained weight gain in patients with Crohn's disease who are treated with infliximab remains a mystery, according to investigators in a small study reported here..."
They sited one small clinical study, and further compared other records from 92 Crohn's patients and 51 rheumatoid arthritis patients who were being treated with Remicade.
"...Overall, the patients with Crohn's disease gained almost five times as much weight as the arthritis patients (4.97 kg versus 1.1 kg, P=0.0049). Some Crohn's patients gained as much as 20 to 30 kg, Brown reported. "
Good luck to you and your son.
Jan