Let's just say I know people who visit various Lawrence eating establishments often, and know the staff of those establishments very well.
The staff(s) are very informed on Manbearpig's eating habits, albeit the last tidbit I got on Manbearpig's gluttonous appetite may be a little dated.
Given Lew's edict about him losing weight, maybe times have changed. Albeit no picture of Manbearpig indicates any weight loss.