Why do some people lose weight faster, and others slower?

Things like BMR can be up to 30% different for people with exactly the same stats. I imagine some of that has to do with genetics. Some people fidget a lot and burn extra calories by doing that (I think it's like 100/day). Some people might underestimate their calories while other overestimate their calories. Even in scientific studies where people are eating the exact same amount (as measured by someone else) and are of similar stats, there can be pretty big differences in weight loss.

Other than that, I don't know. I read something about different body styles: mesomorph, endomorph, and ectomorphs who lose and gain weight differently, it was far from a scientific study but it was an interesting thought. (Google it, it is interesting)

Edit to add: since there can be such differences in BMR, It wouldn't really hurt to cut a hundred or so calories a day and see what happens. If after a week things are the same, you could bump it back up. (Just a thought). Also some people work out more or walk faster (thus exerting themselves more).

I think it may have to do with metabolism, body composition, and exercise levels maybe?

I feel the same way. I'm eating the exact same thing as my weight loss partner and in 2 weeks they have lost 4 lbs and I've only lost 1! I even did zumba during the week thinking that would help me shed quicker, no such luck. I'm going to keep going though. Even though the scale isn't showing it, my arms feel smaller in my t-shirts and my pants are slightly more comfortable than they were 2 weeks ago.

So maybe you'll shed inches first and then pounds. At least that's what I am going to continue to tell myself on this weight loss journey .

Anyone know the answer? I am losing weight VERY slowly... I'm totally bummed by it, and see others shedding their access weight.

How do you or they know it's excess weight? meaning fat I suppose?

For far too many who have no idea, they are actually losing a decent amount of muscle mass because of their deficit amount and their choice of workout.
I can give you a diet and workout routine to encourage muscle burning and you can lose weight fast too.

And they will regret it later. Shoot, ask on the forums how many regretted it sooner because they plateaued for 6-9 months. Their speedy weight loss isn't so speedy when you add 6-9 months of no loss.

Shoot - ask how many are doing this 2, 3 , 4 or more times in their life, regretting it each time.

And they readily comment "well, I know it works for me because the last 2 times that's how I lost my weight fast...".

Uh huh.

So while slower is better because you purposely picked a deficit amount that is reasonable, that doesn't mean you may not have just shoved your metabolism down into the dumps and are getting little deficit because you body has balanced lower.