There's nothing fancy about the food, although it is "healthy" in the sense that there's few processed snack foods provided and few desserts. It's not organic, Paleo, vegan, whole grain, juice-based, or any of the other restrictive plans that tout themselves as being absolutely necessary for good health. There might be populations that need something more specialized, but once again, plain old moderation has had a huge impact.
It's also very cheap! $7 a day for lunch and dinner. Of course, they accept donations, so a person of more means could pay the flat fee and donate more, but I don't think they even ask for an income statement. It's meant for shut-in's but no requirement there, either.
So, if you find you just can't make No S work on your own, you just have to make it until you're 60, are debilitated enough so that you won't go buy more food, and live where they have the service!

Seriously, for some older people, this is a viable option, I would think, and hearing about it may give younger people the incentive to realize, hey, I can do this on my own.