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.
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Nonprofit organization focused on extending human longevity through calorie restriction
2 hour interview with Dr. Rhonda Patrick (FoundMyFitness) on YouTube
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
Low-calorie diet during active period of the cycle increased life span in mice
UT Southwestern Medical Center - 05-May-2022
Triple the effect seen over simply restricting calorie intakeRead more...
Limiting calories rewires immuno-metabolic function for longer healthspan in humans
GEN News - 14-Feb-2022
Protein produced by macrophages was identified as a key player of calorie restrictionRead more...
Exercise paired with intermittent fasting is the best way for fat loss
University of Toronto - 07-Feb-2022
Experts share the science, benefits, best timings, and other tips of intermittent fastingRead more...
Feeding dogs once daily might improve health and cognitive function
Newsweek - 16-Nov-2021
This is another indicator that time restricted eating (TRE) has benefits in mammalsRead more...
New study responsible for the metabolic benefits of a Calorie restriction diet
University of Wisconsin-Madison - 18-Oct-2021
Fasting alone recapitulates the effects of Calorie restrictionRead more...