Comment by dahart

> To nitpick, bodybuilders and athletes usually control their diet at a level where calorie counting is not relevant.

To further nitpick, all of bodybuilding is based on a routine of bulking and cutting, where the cutting phase is intentional calorie deficit before competition. Whether or not they track calories per se, all of them are using CICO and proving that it works.

https://en.wikipedia.org/wiki/Bodybuilding#Bulking_and_cutti...