@arist007 How was your TDEE calculated? If using a TDEE calculator, did you log “sedentary” as your activity or did you log that you workout x amount of time per week? If you logged that you workout a certain amount of times, then it’s already accounted for so don’t eat those back. If your TDEE is 1800 and that’s your intake, you’d be in maintenance tho, therefore not losing weight.
If you logged yourself as sedentary, and then let’s say you want to lose 1 lbs/week, that would mean you have to subtract 500 calories to your daily intake, making it 1300. L
Now, to decide whether or how much to eat back from your workout calories. First, how did you calculate that you burnt 400 calories by working out? If it’s using a cardio machine that’s probably wildly inaccurate. If it’s using a smart watch, that’s probably still inaccurate but not as much as with the cardio machine. I’d personally be conservative about eating back calories from a workout, tho 400 is a big number. That’s the thing, it’s hard to know precisely how much you burnt from a workout.
From tracking my weight and my intake religiously I figured out my apple watch overestimates but not by a lot, about 100 calories/day, so if my apple watch told me I burnt 400 calories working out, I’d feel good about eating 300 of those.
You could also eat back 400 and the worst that could happen is you don’t lose weight.
Overall, to know how much you burn from workouts as accurately as possible, you gotta track your intake and your weight pretty religiously, write down exactly how much you think you burnt from a workout and make the best guess you can.