Individuals with a larger body mass naturally require more energy to maintain that mass. However the calorie-burning effect of a larger body mass is not simply linear, because overweight individuals also have an elevated metabolic rate. CRAN practitioners will either target a new weight or a new level of daily caloric intake, but neither the choice of a target nor the route to the target are obvious. It is impossible to answer these questions with any precision using current scientific knowledge.
People vary greatly in initial weight, age, height, health status and bone structure.
More fundamentally, it has not currently been proven that CRAN extends the lifespan of humans, much less what the optimal CRAN or transition to CRAN is for any specific individual. The best we can expect from current scientific knowledge is information on avoiding the detrimental effects often seen with weight loss. Some CRAN practitioners attempt to trivialize the significance of Adequate Nutrition in Caloric Restriction, but the most knowledgeable researchers in the field rarely speak of restricting calories without emphasizing the importance of sufficient nutrient. There is a good reason for this, not the least of which is the fact that a significant proportion of researchers prior to 1970 failed to properly demonstrate the life-extending properties of Caloric Restriction due to insufficient attention to Adequate Nutrition. I am strident about this point not because it is a marketing issue, but because it is an issue of public health.