The only proven way of currently extending life expectancy in a variety of mammals is undernourishment (not malnourishment) but requires further study to see whether it has undesirable side effects.
Long lived species have less response to famine so, according to Aubrey de Grey, not likely to have a big impact in humans.
Book about food and dieting by James W. Clement.
Explains NAD+ synthesis is circadian, and how SIRT1 is critical in ISCs - 2016 Roy Walford lecture
Food odour nullifies lifespan benefits of dietary restriction in nematodes
Lifespan.io (LEAF) - 29-Apr-2021
You may have to avoid smelling, not just eating, food for CR to be effectiveRead more...
A low-calorie diet maintains youthful gut state & improves lifespan
Fight Aging! - 24-Mar-2021
Calorie restriction prevents age-related changes to the gut microbiome in miceRead more...
Rapamycin might not be an alternative for calorie restriction
Lifespan.io (LEAF) - 27-Jan-2021
Failed to mimic dietary restriction pathways on extending lifespan in progeroid miceRead more...