Let me guess, some of these same universities who tried replicating his experiments and failed repeatedly were also the first ones to find out or suggest in their post-clinical studies analyses that were "other variables" Spurlock didnt mention or lied about that were also key, major factors in him, if not moreso, then just eating Big Macs meals for a month at McDonald's.
Did some of these university studies or other amateur documentations suggest being a severe, binge alcoholic was a more likely factor to Spurlock's claims that first laid doubt on his credibility?