Earlier quoted context omitted.
you are ignoring what he said. I don't know if it's true, but he's saying CI is not simply a function of how much you put in your mouth, but how much of that your body absorbs. the other answers here are more detailed, I just wanted to state it simply.
Not ignoring it - the in in calories in isn’t what you put in your mouth, it’s what you can absorb. Hence why you don’t count fiber towards your calories. Again, the digestion point seems to reinforce CICO. If you gain weight because your digestion is slower (let’s grant the point), it’s not because your body some how treats calories differently, it’s that you’re getting more calories from your food. Your calories in…
Throwing information out like this (w/o source and at best poorly replicated), that CICO is useless because of digestion rate, is incredibly dangerous because it falsely legitimizes that hopelessness. It traps people. And it maybe only applies in Anyone and everyone can lose the weight. It’s just CICO. You gotta figure out your input and output to account for the minor individual variances, and lock in a lifestyle to do it. But it’s just CICO at the end of the day.