I think you and /u/Carsandsarcasm both make very good points, but I think the difference is where the desire to weigh is coming from. If you're like a normal bodyweight maintainer who weighs ~weekly it's because you're building an average over a period of time to stick to (example: I've fluctuated between 135-145 since highschool almost a decade ago so my average weight is 140, and I won't worry if I'm 142 one week and 137 another. If I suddenly went 126 or 151, I'd know I needed to make some changes to my habits.) If you're a fatty trying to lose weight without much understanding or experience of how the body and weightloss works, you may very well be obsessive, using the pleasure of each minuscule fraction of a pound weight drop to replace the pleasure of over-eating. It causes a lot of problems though; as has been mentioned, water weight fluctuates so much that if a fat is only seeing the numbers in an up-and-down linear fashion, they aren't accounting for those changes. That's why so many fats say "I tried dieting and I gained weight! It's doesn't work!" It's because unlike maintainers, they don't have an average baseline. Let's say I was a fatty who maintained my weight, I'd have an average of 235-245 (so I'd say I'm 240lbs). And I wanted to get to a healthy 135-145 (so, 140lbs). I'd know to account for that variant. If on Day 1 I am 243 and on Day 15 I am 230, I know not to panic and throw in the towel if I see I'm 232 a week later. That's not gain, that's fluctuation. Stick with it, the average will go down despite the sporadic daily water weight changes.. Am I making sense? I don't think I'm explaining this very coherently, I'm a bit sleep-deprived.