Discriminating Surgery: Some regions in England will only allow joint replacements on thin people:

Obese people are to be denied some surgical procedures in a bid to cut costs in the NHS.

Three Suffolk primary care trusts have ruled patients with a body mass index (BMI) over 30 will not get operations like hip and knee replacements.

A person of average weight would have an BMI of between 18.5 and 24.9.

That means a 5 foot 4 inch woman weighing 180 pounds would not qualify. They're not targeting morbid obesity, they're targeting most people in the knee-replacement age range.