1. Unlike other addictions, you have to continue consuming this one or else you will die.
2. Nearly every social event in the USA is tied in some way to food which means that you have to exercise willpower __constantly__ if you have a social life.
3. People are more interested in shaming you than supporting you. Most want you to fail.
[1] https://www.youtube.com/watch?v=xV9spqCzSkQ
I've been arguing with people online since Usenet was mostly used for discourse instead of piracy. Trust me, I know that there's no point.