There's a lot of space between obesity and underweight. What's being discussed here is use of excess stored body fat to extend one's food supply without impacti

There's a lot of space between obesity and underweight. What's being discussed here is use of excess stored body fat to extend one's food supply without impacting muscle mass or cognitive function. Perhaps I should have added the recommended minimum body fat levels but anyone getting near those levels would be unable to get an appreciable number of calories from stored bodyfat anyway, defeating the purpose of using body fat for food supply extension.