> In 2016, Pontzer and colleagues published a study putting forward the constrained energy model: Energy expenditure does increase with more activity, but only to a point. Once physical activity gets really high, the body will adjust other components of the metabolism to keep your daily energy expenditure within a narrow range

https://physiqonomics.com/biggest-losers/

https://www.theatlantic.com/health/archive/2012/07/study-off...