Exactly.  I've had a bad back since I was a teenager, and every doctor I've seen has said, "Keep your weight down, being overweight will make your back worse."  I also had an anesthesiologist comment that he loved that he could see my vertebrae, he said "Most of my clients have so much adipose tissue that I can't see the vertebra and must feel my way to the proper place."  Thin privilege is not having a doctor paralyze you with a giant needle because he couldn't find your skeleton.