Mr. Pontzer, many people are lacing up their running shoes these weeks in order to lose a few more kilos before the holidays. Is that the best way? No, unfortunately that hardly helps at all when losing weight.

I'm sorry, what? I just ran a few kilometers here on the university campus. My fitness watch praised me for burning an extra 300 calories. I would have to get a little slimmer. No, I have to disappoint you, it doesn't work that way. Being physically active and exercising doesn't mean you burn 300 more calories a day than someone who hasn't exercised. Even if your fitness tracker says so.

Access to all STERN PLUS content and articles from the print magazine

ad-free

Already registered?