To summarize the article, it comes down to 2 keys: Diet and Exercise. What is never talked about (sometimes hinted at or briefly touched on) is the 3rd Key:
Emotional Bandwidth (or perhaps, emotional strength or support.)
The author did say that at 1 or 2 points that weightloss certainly requires discipline, but that doesn't really explain it fully.
In order to be truly successful at achieving a healthy weight on a long term basis, one needs a good deal of emotional support/strength/will-power/whathaveyou. This is why when you're part of a Weight Watchers group or are part of a team that trains regularly or you have a personal trainer, things tend to go well.
When life is not going so well, many of us compensate by stopping the hard workouts and eating more (both of which make us feel better in the short term.) Then once we get used to the extra feeling of more food and sitting around, it becomes habit.
More needs to be said about how to bolster Emotional Bandwidth (strength, support, discipline, etc.)