It’s true that it all comes down to the deficit but it’s easier to create a calorie deficit when you include exercise. When “making weight” in the run up to fights I used to meticulously calorie count and aimed for a 1000 calorie a day hole.

When you’re burning 3500 calories, eating 2500 doesn’t feel uncomfortable at all (except towards the end where your fat levels get very low and your body is just constantly telling you you’re hungry).

But yeah, it’s all just numbers in the end.