Say someone with my height, weight, age and activity level needs to consume 2,000 calories per day. As an aside, the actual tool I use as a reference point when determining what percentage caloric restriction I'm doing is the one at this link: https://www.nal.usda.gov/fnic/dri-calculator/.
If reducing caloric intake by 50%, and consuming 1,000 calories a day doubled my lifespan, would reducing my daily caloric intake by 75%, and consuming 500 calories per day, quadruple my lifespan?
Basically, I think what I'm trying to ask is if the increase in lifespan from caloric restriction is inversely proportional to the percentage caloric restriction an individual is doing.
And, is there any minimum caloric intake individuals practicing caloric restriction for longevity should have, just for the sake of having calories? What I mean is, say there was a way for an individual to get all the nutrients they need, somehow, in only 500 calories a day. Would increasing calories at that point help with longevity in any way?