I had associated crapulence with drinking, but thought that perhaps the eating connection was there and it is. Take a look at AHD:

"1. Sickness caused by excessive eating or drinking. 2. Excessive indulgence; intemperance."

OK. The patient is at the doctor's--and the patient is sick. Sick from excessive eating? Or drinking? Well, whatever. Excessive eating would figuratively form too large of a congregation in this man's temple.

So, I must beg to differ with AnnaS and NancyK. I think crapulence works in the passage, although corpulence would have also worked.