Those commenters are delusional.  Fat-shaming sometimes motivates people to lose weight--to the point that the Daily Mail had several articles about people who went from deathfat to human because their friends fat-shamed them.  For that matter, look at Japan.    Mentally rewarding people for announcing good intentions tricks the brain into thinking "the task is done!" and thereby guarantees they are less likely to take action.  300and30 is now fatter than ever before, did all the back-patting supportiveness she got on /r/fatpeoplestories do her any good?  No internet points feel as good as being fit.  No fat-shaming feels as bad as dying of sleep apnea and T2 diabetes.