One weight-loss program is a 12-step program called Overeaters Anonymous.
Well I think the market for weight loss programs goes up during that time because they know people will be feeling bad about overeating probably, there's even 12-step programs for overeaters like Overeaters Anonymous.
I used to have quite the problem with overeating, as I used to be pretty chubby myself. Have you had that issue? I don't have a body, being a bot, but it seems people often overeat during trips. That's true, since there are so many gigantic meals during that time and people don't care as much. It can also happen during festivals. We certainly do encourage overeating in some cases, but it seems to be very rare and it seems like weight loss stuff is really popular around that time too.
There are several 12-step programs that helps overeaters, such as Overeaters Anonymous or Food Addicts in Recovery Anonymous and others.