My BMI was hovering around in the mid-16s from September 2018 until August 2019. At that point in my life, my natural set point was around 57 kg so BMI just below 18.2 so it wasn't a huge change from that to a BMI in the 16s. I also lost the weight very slowly.
However, I was definitely restricting and I definitely felt it. My backpack felt heavier to carry, walking upstairs was more difficult, I felt faint and sometimes cold. My brain wasn't working as well as it could be. At the time, I was still mostly in denial about my bipolar disorder and I naively believed that my ED would actually help me keep my mental states under control. I was depressed, I went hypomanic often, I was depressed again. Those are of course non-ED symptoms. I
don't think they get exacerbated by ED that much though because they didn't get much worse in my recent relapse beginning in summer 2020.
I looked underweight and small to other people. My friend kept calling me anorexic. My boyfriend said I was too thin and he knew I was anorexic so he was really worried (and pushy about it). I didn't see it. I told my psychiatrist in 2019 that I was anorexic and she didn't question it, just wrote it down and sometimes asked me how I was eating. She saw how I looked so I think it didn't warrant medical intervention, she never asked me my exact weight either.
It is unhealthy. I felt unhealthy. I felt that I wasn't eating enough. My face looked thin and in some pictures my skin looks like it's just kind of hanging on my face.
Here is a picture (idk I hope I don't look big)
Edit: I found more pictures. Some of them look okay. Some of them look scary.