Define 'stress', especially for these animals. Wouldn't you think that living in a laboratory cage is 'stressful'? If that's the daily baseline, I can't see how

Define 'stress', especially for these animals. Wouldn't you think that living in a laboratory cage is 'stressful'? If that's the daily baseline, I can't see how 'stress' can be a catchall explanation for even borderline cases. Administering anesthesia is a form of surgery. Even if they're related, would you want to say that death during surgery is a form of aging? More importantly, deaths are just one of the variables being measured. The diet seems to improve quality of life, not just raw quantity. That's reason enough to be interested in these findings. Furthermore, the author of this blog seems to doubt the role of Science in publishing these findings. The money they make has no bearing on the results. Other scientists, doing closely related work, reviewed the work in excruciating detail (read the footnotes, not the press releases) and found its clear scientific value. Sure, blame the media for the headlines. But the work, as a status report on the field, is very encouraging.