Have lost 50lb since Dec. but it's slowed.

define dramatically slowed down....if you are losing 1-2lbs a week that's great. The slow steady pace is more sustainable. As well weight loss is not linear...as a female you can retain water for various reasons....which can mask weight loss.

You started with 150lbs to lose...you've lost 50....if most was before April that was on average 4lbs a week which is expected with 150lbs...now that you are at 100lbs it will slow down...and 2lbs a week is a good rate.

1200 calories is the minimum MFP will give you....with the amount you want to lose i suspect you could be eating more on a regular basis. Part of weight loss that a lot of people don't get at first is that weight loss comes from fat and muscle if you aren't careful....so losing at a slower rate, getting in enough protien and some resistence training is a good way to ensure you are losing mostly fat.

If you have 75+ lbs to lose 2 lbs/week is ideal
If you have 40-75 lbs to lose 1.5 lbs/week is ideal
If you have 25-40 lbs to lose 1 lbs/week is ideal
If you have 15 -25 lbs to lose 0.5 to 1.0 lbs/week is ideal
If you have less than 15 lbs to lose 0.5 lbs/week is ideal

100% this.

I know when you are as heavy as we both are (100+ pounds to lose), we don't want to hear that 2 lbs. is a good rate. We want it to fly off and never come back. I am just now coming off a 2 week stall. I gained and lost the same 1.8 - 2.0 pounds so many times I was getting dizzy going up and down. I wanted to give up. I was frustrated that I was weighing everything, measuring to the grams and ounces on a scale, doing my exercise, everything was scientific and I was still not losing like I wanted to. The thought of just giving up and grabbing the cupcake was waiving in the back of my mind. I was mad, mad, mad, at the scale and ready to strangle the thing.

A couple questions. Is it possible that you have calorie creep (calories adding up from sources you forgot to log, did not measure and eyed instead, or a bite here and a bite there)? Is it possible that you over calculated the amount of exercise you are really getting (better to always underestimate)?

If you are sure about your intake and output, without any doubts, then just hang in there. My stall just broke and in 2 days, I dropped 2.8 pounds. Your body has already gone through a lot of changes and it sometimes needs to "reset the calibration". Give it time to do that, but remember what you did to lose those 50 pounds. You obviously did something right, so don't change that now.

Also, in the past, when I hit stalls....I increased my exercise by 400 calories burned and increased my food intake one half of that (so increased food by 200 calories). I did that for six days and it helped to limit the effects of the stall.

No matter what, don't let a stall throw you off the track. 50 pounds!! Wow, isn't that an accomplishment?? You hang in there.

Also remember, it took you a long time to get to your starting weight, so it will also take it a long time to get it off. It can be a slow process, but that's the healthiest and best way to keep it off long term! Congratulations on 50 lbs gone AND maintaining 2 lbs a week still!

By dramatically I mean in April I only lost 4 pounds the whole month. This month I have lost 7. And I do think that maybe part of it is there may be some things that I haven't calculated correctly and that may be the issue. I have not added exercise yet but will be doing so in the next week. I am super excited about what I have lost so far I just don't want that to change and not lose anymore and I see that there may be of some things that I need to change. Thank you so much for your feedback I really appreciate it! I'm just ready to start knocking off at the next 50!

That's still a decent weight loss for a month. Log your foods again and move more and it will keep coming off. It's normal for weight to come off rapidly to start when one is bigger, then slow down as your new weight requires fewer calories to maintain.