I'm having trouble understanding what you mean by noting this - would you mind clarifying?
If he's overweight, it suggests that his self-help advice is ineffective. Of course there are a few alternate explanations: That his advice is effective, but not sufficiently effective to diet successfully. Or that he doesn't care about being fat. And probably others too.
Still, successful weight loss is one of the closest things to guaranteed success if you are able to get your s* together. As opposed to other goals like getting rich or finding and marrying the love of your life. And there are so many advantages to being thin that pretty much every fat person has tried to lose weight. Some of them, many many times. So I wouldn't trust a fat self-help guru.
Hope that clarifies things.
The new year is a popular Schelling point to make changes to your activities, habits, and/or thought processes. This is often done via the New Year's Resolution. One standard piece of advice for NYRs is to make them achievable, since they are often too ambitious and people end up giving up and potentially falling victim to the what-the-hell effect.
Wikipedia has a nice list of popular NYRs. For ideas from other LW contributors, here are some previous NYRs discussed on LW:
(If one of these were from you, perhaps you'd like to discuss whether they were successful or not?)
In the spirit of collaboration, I propose that we discuss any NYRs we have made or are thinking of making for 2015 in this thread.