Maybe we don't like to think it's so, but things like this could happen to anyone. It's set and setting. Combine a certain mindset, and suffering, and an environment that supports a certain unwise way of dealing with that suffering, and stuff like this happens. Maybe your thing wouldn't be eating. Maybe it'd be heroin. From the Buddhist perspective, it's the same thing -- doing something unwise to get away from pain, even if it traps you in a local minimum.
This is why I meditate, and why I encourage others to try it enough to get what it's about. If you can get some kind of distance from your pain, to see it as just feelings that shouldn't be confused for oneself, you can be sort of like a firefighter, putting out suffering in yourself, helping to extinguish suffering in others, and never ever fanning the flames.
I think it's easy to ridicule this guy because we wouldn't destroy ourselves in the same way. But ask yourself whether you might be a certain unlucky one-two combo away from feeling so desolate that you just want the pain to stop and don't really care how.