Cue the public relations gibberish. The public isn't well-served by science writers who seek out and then swallow whole the nonsense foisted off by those with vested interests in the public's opinion and perception of their work. In this article from Nature, I couldn't help noticing the uncritical repetition of simple nonsense. [NEWS 22 March 2018. Alison Abbott: Reduced-calorie diet shows signs of slowing ageing in people. Most comprehensive study yet demonstrates that cutting people’s energy intake dials down their metabolism.]
The history alluded to in the article regarding the effects of caloric restriction in animals is cherry-picked, to say the least.
Not mentioned at all of course is the harsh reality behind the allusion.