I also thought the same thing. The article didn&#x27;t really address the point specifically, if you are highly active most of the day you will burn a substantial amount of calories. Some people maintain weight while consuming 4000+ calories per day, for example on long hiking trips or long distance running.<p>I&#x27;m not sure about the hunter gatherer example. That was interesting. Maybe they are in much better shape and can be active a large portion of the day without expending much more energy. Or simply, the activity isn&#x27;t extremely high-level.