It's true though. Infectious diseases literally evolve to infect you -to use your body as a host- and you think eating your veggies will stop a severe disease from rocking your world?
Look, my statement was a bit hyperbolized. Of course, being healthy is a must. Obviously, fat people will die at far greater rates from most diseases. But there comes a certain point on the healthiness scale, where no matter how much good food you eat, it won't help you any more. Your immune system is either impaired, or it isn't. And sure, exercise will lead to greater amounts of immune factors and all that, but all the same, it irks me when people say that eating right and being healthy will save you. It won't.