It is true that diet is directly responsible for the vast majority of weight regulation, but exercise is just as important in an indirect manner. 99% of the time you aren’t going to burn enough calories to make a significant difference, but regular exercise has significant effects mentally, several of which contribute to make people much more likely to keep on a diet. IIRC, there was a study that showed it being a bigger factor in weight loss, because people who diet without exercise are far more likely to drop the diet, while people who start with just exercise are more likely to pick up and stick with a diet later.
It is true that diet is directly responsible for the vast majority of weight regulation, but exercise is just as important in an indirect manner. 99% of the time you aren’t going to burn enough calories to make a significant difference, but regular exercise has significant effects mentally, several of which contribute to make people much more likely to keep on a diet. IIRC, there was a study that showed it being a bigger factor in weight loss, because people who diet without exercise are far more likely to drop the diet, while people who start with just exercise are more likely to pick up and stick with a diet later.