I think it's more accurate to say "choose any two of the four." Certainly there are ways to have tasty and healthy or fast and healthy foods, but you may miss out on the other things.
Current reality. I'm not sure why, but really unhealthy food seems to be very very cheap (think chips, crackers, snacks, chocolate, etc). And healthy food tends to be expensive, usually takes some time to cook, and it might not taste very good.