Not just out, both directions can be tricky to measure. It is hard to say for certain how many potential kcal you're consuming are actually absorbed by the body. If you see whole corn kernels in the toilet, those kcal didn't count :)
But yes. CICO is and always has been absolutely true. People are just overly reductive in how they measure both sides, and then claim that CICO is garbage.
But yes. CICO is and always has been absolutely true. People are just overly reductive in how they measure both sides, and then claim that CICO is garbage.