My 8th grade history teacher had exercise anorexia and she is the only person I've ever personally known to have been prescribed bedrest. She was pregnant and she was going to lose her pregnancy because she was still running at the track to try to keep fat off.
In 2015 when I learned that Alexandra Kleeman had done this article on bedrest I got really mad for reasons I couldn't understand at the time. It only hit me today that, uh, I have seen what this should be used for and it's not a lifestyle intervention for the idle speculation of some writer on her way to the Rome Prize.
https://harpers.org/archive/2015/12/the-bed-rest-hoax/