Many people believe that obesity has nothing to do with fast food or the unhealthy food they serve us. They see it as something we can live with, something that results in a glut of excessive food. They say it's all about how much you eat, not what you eat. Obesity can be caused by lack of sleep, hydroroidism, Cushing's syndrome, etc. This is all a result of what we do, not what we put in our mouths. In 1950, 50% of jobs required physical activity, in 2011, 20% of jobs required it compared to 80% not requiring physical activity. The second reason why many people believe that obesity is not a disease is that one can live a long time with the disease. A 2013 Lancet article noted that at least a third of obese people are "healthy obese," meaning that, despite being significantly overweight, they have normal cholesterol and blood pressure levels, and no signs of diabetes. Still, some of them may have a high BMI, also called body mass.