Calorie restrictive diets do increase longevity. It spreads out the food intake across a larger period of time and your vital organs like the liver do not get fatty and the risk of diabetes damaging you/organs goes down.
Like the saying goes, “If I would have known I was going to live this long, I would have taken better care of myself.” But life is uncertain which is why we always have dessert first. Have a Happy Mother’s Day.