The obvious benefit is having a greater ability to produce cellular energy, in principle also having the feeling and experience of having more energy. When you

The obvious benefit is having a greater ability to produce cellular energy, in principle also having the feeling and experience of having more energy. When you gain weight your overall energy expenditure does go up a lot, but not really in a useful way- you are just supporting the maintenance and physical movement of the extra weight. It’s more useful to think of energy expenditure in proportion to bodyweight.