I could make, at best, an educated guess at the author, but I read something maybe 30 years ago in which heart patients were relocated to low-gravity planets (or satellites?) because reduced gravity meant the heart did not have to work as hard and could heal. At the time, it seemed to have been carefully researched and fully plausible.
Which gets me thinking about what other benefits there might be, medically, in reduced gravity. I'm no medical professional, but arthritis suffering could lessen as the apparent weight on joints in motion is lessened. A broken bone will heal no faster, but might bear weight sooner as it mends. Hips and knees might last an entire lifetime for nearly everyone, so the elderly, with their increased lung capacity and less stressed hearts, could be far more healthy and active than they are here on Earth.
Maryn, who used to read a lot of sci-fi