Not necessarily if you have lipedema.

I spent over a year anorexic, eating less than 150 calories a day. All it lead to was too was dangerously low blood pressure, but I was still considered overweight with a BMI of 24. I was all of 13 at the time.

Also if someone with hypothyroidism was in a concentration camp, they probably would be dead within the year, unless the Nazi's were big on providing quality medical support, which shocker, they weren't.