Hi to all!

Hello, @Becdoll, and welcome to the MFP Community!

I'm one of the people described by Em's post: Severely hypothyroid, lost weight using MFP, have maintained a healthy weight for 7+ years since losing from class 1 obese to a healthy weight.

It helps, I know, that I'm properly medicated for the hypothyroidism, with regular monitoring and sometimes dose adjustment to keep me on track. If you're more recently diagnosed and still working on getting the right medication regimen in place, that will be a help, I suspect.

For me, simply figuring out the right calorie intake to lose weight was the key, and then keeping it sustainable by hitting that calorie level eating foods I enjoy that add up to good nutrition and that I find filling, practical, and affordable. That took some experimentation at first, but it was doable.

The main things about hypothyroidism and weight loss are that we may require slightly fewer calories than people with normal thyroid function, and the hypothyroidism can bring on fatigue that reduces our calorie burn in daily life.

IMO, the way to deal with the calorie needs question is to start with MFP's calorie-level suggestion for a moderate weight loss rate (not extreme), then see what the net effect on body weight is over at least a 4-6 week timespan. (Compare bodyweight at the same relative point in at least 2 different menstrual cycles, if that applies to you, to estimate average loss per week. Hormonal water weight shifts can be that weird!) With that data, you can adjust your calorie intake if needed to hit that moderate weight loss rate going forward. (Use the estimate that 500 calories per day is about a pound a week, and use arithmetic if fractional-pound adjustments are needed.)

As far as fatigue goes, getting as good sleep quality/quantity as we can may help, and so may stress reduction/management (because stress is fatiguing). Moderate exercise can also help - definitely no need to do something punitively intense and exhausting, because that can be counterproductive.)

I feel sure you can succeed at this, with patience and persistence. I'm not the only hypothyroid person here who's found it possible. Of course, weight management isn't easy every second for anyone: Everyone has their challenges. Hypothyroidism can be one, but there are ways to succeed despite it, IME.

You might also benefit from reading this thread:

https://community.myfitnesspal.com/en/discussion/10767046/hypothyroidism-and-weight-management

It was written by a (former?) MFP-er who's a scientist in the field, himself hypothyroid, who lost weight via calorie counting. Unlike a lot of nonsense sites on the web who try to sell us "cures" or "hacks", it's solid science-backed information.

Wishing you success: It's worth the effort in quality of life improvement, if my experience is any example!