Studies show that giving mice
2/3 their normal caloric intake boosts their lifespan by 1/3.
The longest living people in the world always have two things in common: they generally claim to eat very little and sleep adequately.
"I eat to live, not live to eat" as the current oldest living man said.
Assuming the same principal applies to humans, which are similar to mice in many ways, I made this spreadsheet to see how much time reducing 1 calorie can gain you.
And then I checked how much a typical food item can cost you in time.
That bacon cheeseburger is gonna cost ya 1/3 of a day.