Slow Metabolism in Humans Results in Long Life Span

A new report claims that humans and other primates burn 50% fewer calories each day compared to other mammals of similar size. 

Experts believe this reduced energy expenditure is responsible for our slower development and longer life spans. 

A human would need to run a marathon every day to burn the same amount of calories as a comparably-sized non-primate mammal.  

Proceedings of the National Academy of Sciences, January 2014