Obese Exposed as Swine Flu Collides with Fat Epidemic "An unexpected characteristic has emerged among many swine flu victims who become severely ill: They are fat. ... People infected with the bug who have a body mass index greater than 40, deemed morbidly obese, suffer respiratory complications that are harder to treat and can be fatal." JWR Adds: They are also prove difficult to transport to hospitals, and even just to draw blood samples.