Humans have a greater capacity than other primates to store excess energy, potentially facilitating development.

“so our metabolic rate so this is you know he documents this through lots of assessments of doubly labeled water on not just ourselves but also kind of you know hunter gatherers that are still around today and then of course all the primates is you know we're really kind of unique in our energy expenditure our our energy needs are far greater than anything else and you know people like that would argue hey that was kind of an advantage that we took to allow our development including our brain development”