you must be in a calorie deficit. You do this by either reducing the extra calories you're consuming or burning more than what you're eating with exercise. You've probably heard of the 3,500 ...
Your body needs to run a calorie deficit to lose weight ... If you eat very rapidly, start by adding a few minutes to your meal time and build up. Make small, realistic, and consistent changes ...
Body recomposition means to not necessarily go into a calorie deficit or calorie surplus with your nutrition, but aim for close to maintenance and train in a progressive way to gain muscle.