Assuming your TDEE stays constant (and assuming it's calculated accurately) -- and assuming your body doesn't play fucky with electrolyte + water balances causi

Assuming your TDEE stays constant (and assuming it's calculated accurately) -- and assuming your body doesn't play fucky with electrolyte + water balances causing you to lose Xlbs amount of fat, but gaining ~Xlbs of water retention due to hoarding of hydrophilic nutrients due to caloric restriction. Biggest issue though is TDEE will decrease to compensate for less calories (and increase for more calories). Even for small things like fidgeting or deciding to go for a walk, or just be more chipper in general -- it matters and adds up. 500cals is a rounding error. You can eat an extra 500 calories per day due to discrepancies in dietary labeling, because the methodology (and the leniency allowed in how accurate calories reported can be) are shoddy. Frankly, I'm not interested in weighing less. I'm interested in losing fat, so I look and feel better. I can lose 10lbs by just carb-loading, and then not eating for a few days (shedding water weight due to lack of insulin). Fastest and most guaranteed way to lose fat is to fast, and do low-intensity cardio. Second best is PSMF and low-intensity cardio. Next best is keto and low-intensity cardio. After that? I don't know, you can count calories and do the recommended -500cals per day, but you'll probably be doing that forever without significantly changing your body composition.