[philwelch]

> You went to the trouble of mentioning CICO and then totally forgot about CO! Obviously you could extend this sentence to "... and/or you don't do enough exercise" but, similar to the previous point, there are likely to naturally be variation in calorie outputs.

This is technically true but a but specious. Obviously you shouldn't eat as much as Michael Phelps if you don't train like Michael Phelps. But it's probably a lot more actionable for you to eat fewer calories than for you to start training like an Olympic athlete.