Why has my weight loss plateaued

Totally normal. Keep doing the right things and it will happen.

With only 10 pounds to lose you'll have to be really diligent on accurately tracking your food, or at least that was my experience with the last 10 pounds. It took me quite a while, at about a half pound per week. Some weeks were no loss at all.

Keep goin'.

Compared to many others, you didn't have much to lose to start with; the last 10lbs is slow for everyone losing weight at a sensible rate and you may repeatedly see weeks with no obvious movement. If you can switch your scales to measure your weight in kg, you may see the tiny fluctuations (and be aware that your weight will go up and down, daily - that happen to us all). You can always draw up a conversion chart so you know what it means in stone and lbs (although I eventually gave up and just know my weight in kg now). You're currently 78.92kg. 12 stone 5.75lbs is 78.8kg. That quarter of a pound won't show on most scales, but the .1kg will do.

Have you gone back to the Guided Set Up page and re-saved? MFP doesn't auto adjust your required calories as you lose weight, so you're possibly now eating at maintenance or close to it for your reduced weight. That's certainly feasible if there's no movement at all after a month.

Also, assuming (hoping) you're eating your exercise calories, how are they calculated? Many find that they're underestimating what they eat (requires diligent logging with food entries that match the labels of the products consumed, weighing all solids in grams, measuring all liquids in ml) and overestimating what they burn. If you're sure you're measuring your food intake accurately, you may want to consider eating 75% of your exercise calories.

You're doing fine - but the last bit is slow. Use the time to figure out how you're going to maintain your new reduced weight when you get there.

A lot of what people think are plateaus aren't actual long-term plateaus at all, but rather temporary stalls due to things like water retention or waste in the digestive tract.

If weight loss was going along at a good rate for at least the preceding 4-6 weeks (or at least 1-2 full menstrual cycles for those who have them), then the scale stalls, with no change in activity level or eating routine (or with added activity)? High odds it's some kind of water/waste issue. Bodies are weird.

If that's the scenario, wait it out for at least 4-6 weeks, sticking with the same routine. High odds there'll be a "whoosh" sooner or later - a surprisingly big scale drop.

People will tell you to change up your routine in some way: Change exercise type, change your eating style, cut your calories, increase your calories, blah blah blah. IMO, if it was a sudden abrupt stall, that's just a way to feel like we're doing something about the problem. Then, when the scale drop happens - a drop that would've happened no matter what we did - we give credit to the most recent frantic change.

On the other hand, if a person - still sticking close to the same eating/activity routine - had weight loss gradually taper off over a period of weeks, then stop? Much higher odds that they've found their new maintance calories at a lighter weight, and it's time for a little calorie reduction.

OP, after 8 pounds down, then a 3-week stall, you're probably not enough lighter to make a noticeable difference in calorie needs. If you were losing at a pretty steady rate since August until these 3 weeks, you're probably seeing water retention weirdness. Just keep doing what you're doing - that's my advice.

Others are right: The last 10 pounds should be slow loss. A gradual off-ramp to maintenance is IMO better for a variety of reasons, which I won't elaborate unless someone asks. 😉

Best wishes!