This was mentioned in the article as well, but the fact that there are treatments for many of the comorbidities of obesity that cause death, while if you are thin, your doctor is more likely to assume that you are healthy because it has been so long since they saw a human in their office. They sometime incorrectly assume that a person is thin because they have a healthy lifestyle, and not simply because they don't indulge in the beetus or have a wasting disease.