My son was enrolled in crohns clinical trial at UCSF and had 2 fecal transplants via colonoscopy in 6 months to populate his colon with healthy bacteria. We first read about this procedure for Crohns in an article in the New Yorker, "The Fecal Experiment". He was a changed person the day after, no pain, etc. He said he felt the difference immediately. He watches his diet and doesn't eat red meat. Drinks goats milk. But basically is pretty healthy now.