Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
Physical activity index, total energy expenditure as a multiple of resting energy expenditure, before and during overfeeding (data from references39, 40, 41, 42, 43, 44, 45).
