> Lots of other factors affect metabolism, hunger and energy levels, all of which have huge effect on weight loss\gain. Metabolism/energy levels/etc are Calori

> Lots of other factors affect metabolism, hunger and energy levels, all of which have huge effect on weight loss\gain. Metabolism/energy levels/etc are Calories Out. If your metabolism is low, your Calories Out is lower. Look at BMR, such as https://www.active.com/fitness/calculators/bmr https://www.active.com/fitness/calculators/bmr Very simple. CICO. e: there are relatively rare medical conditions, such as water retention, that can affect weight loss. A better term might be "body fat percentage". But the end result is that if you want to lose body fat, consistently intake less calories than your body uses for energy.