how long until you noticed a difference?

I was seeing mirror changes even when I was only losing inches and not scale weight. It all depends and vary for every person.

It takes me about 15-20 pounds up or down before I see a difference in the mirror. But it definitely varies from person to person.

A week. But that's not really fair, because when I first started I was carrying a lot of water weight from some atypical food choices (I weighed 210 on January 10 and was down to 199 by Jan 17) So that puffy, bloated look went down really fast and definitely made a difference in how I looked and felt.

This week in fact. I had started on my eating plan in January and stayed in the same numbers like (250 - 259). so this week, when the scale turned over to the next set of 10's (249),, I was excited to see it go down. so now MFP says if I continue to eat like this I will be 234 in 5 weeks! wow! that's a set of numbers I have not seen in a long time! I'm not counting everything, but watching what I eat. that's all I can do right now.. but I've been logging in this week.. one step at a time. this week I'm concentrating on bringing my own food and having fruit around here when I get hungry around 3:00.. if I just keep this up I will make it! I got that mindset of commitment, not just a wish to be smaller.

About three months when I purchased 6 new pair of jeans (went from a tight size 12 to a lose size 8). Motivation? I threw out all the old ones.

It takes a while for me, as I am tall-ish (176 cm) with a fair bit to lose. And because of my weight distribution, a pant size takes a goodly while. Eg I am currently a 16-18 (Australia) and my goal is to be about 12-14.
I was that size about 20kg ago, but it's hard to tell as when I previously gained and lost weight it was not baby-related girth. This time around my stomach has an nasty hang to it, thanks to full term twins.

I notice the fit of my at clothes around 7 pounds. At around 10 to 12 pounds I usually drop a pants size. My family doesn't notice anything unless I drop around 20 pounds. And before you ask, yes, this is the last time I plan on having to do this. I'm in it for the long haul this time

9 months and 50lbs for the first big hit and then again 6 months later another 30lbs down. I still want to lose another 5lbs and then I think I am done. BMI 21.8 at that point. I look great...with clothes on. I am going to need surgery for my stomach, unfortunately.

I'm 4'10 and started at 142 last January.
It took me losing 10 pounds to start noticing a difference (height probably effects that!)
But it really hit home by the time I lost 17 pounds (125lbs)
I had a friend who went through her own journey and she told me to watch for my collar bone because that's when she started noticing her weight loss.
Now I can feel where my hip bones are starting to show through and I'm not even at a healthy weight yet. /: but the scale doesn't always tell you things.
Sometimes you just have to feel them! I have been stuck around 122 for over a month, but I can feel parts of my body are different and I've lost a half inch off of my thighs, stomach, etc.
measuring yourself definitely helps.

It's so different for everyone depending on how you lose the weight, where you lose the weight, what you do, where you started, etc. I'm down 35lbs in 4 months and I don't see it but everyone else does. Depends on how you see yourself too.

I felt healthier after 1 week, and saw results after 3. Be patient! I didn't lose anything for the first couple of weeks, but now I'm down 7 lbs after about 6 weeks of exercising daily and eating healthy.

I think I started noticing right away, even with the initial drop in water weight, because I felt less bloated and tired and gross all the time. I started noticing a slight difference in the mirror after about 10 pounds, and of course I noticed how my clothes were fitting looser. (I'm down 2 sizes at this point.)

It took about 15-20 pounds for anyone else to notice, mind you. And those were just people who I hadn't seen in a while. Very few people have commented, probably out of politeness or just out of the fact that most people simply aren't that observant.

I'm at 25 pounds down, now, and my mom finally noticed this week. Or, maybe she noticed before and just didn't dare say anything until now? I don't know. But I asked her if she'd take my watch into her jeweller since she mentioned she was going this week, and I needed another link taken out of the bracelet, and she commented "you've lost some weight, haven't you?" Then again, she usually wouldn't say anything one way or the other -- she's good like that. She never shamed me when I gained weight. And she's held her tongue at all my "no, thank yous" on seconds or starchy sides or extra dessert whenever I've gone there for dinner lately, and she had to have noticed that because of all the extra leftover food. So she's probably just being diplomatic. Which I appreciate, believe me.

I'm about 15 pounds from my goal weight now, and I still want to tone up a lot 'cause my body fat is still way too high for my liking. I don't think I'm going to get the sort of dramatic double-takes from people that others who have lost far more weight get. But that's okay. I'm doing this for myself, my health and my well being, not to stop traffic.