What does healthy or unhealthy mean in this regard? The researchers made sure that the participants were a randomized group of people in a CR and with all of their nutrients met. So that points to a really strong association between CR and this slowing in aging. Thats all this study was saying really. Of course there are various factors that go into good health and now we have potentially found an additional factor, which is why I'm suprised by your opposition to it.

The developed world is suffering from severe overeating. So seeing that calorie restriction can actually have beneficial effects on top of losing fat is great to hear isn't it, why would you want less of that?