Does trying to live healthy make sense considering an imminent bird flu outbreak?

[Spongebob]

I mean, if something is difficult to imagine, it is certainly less likely to be true, even though it can be true. Saying "I cannot imagine how F could be true, therefore F must be false." is arguably fallacious, but saying it is unlikely to be true is not fallacious.

No, you are completely wrong and there's tons of evidence to the contrary:

The atomic model
The germ theory of disease
Heliocentric solar system
Stars
The size/age of the universe
Expansion of the universe
Quantum Theory - That's a BIG one!
Compounded interest
The Monty Hall problem
Fibonacci sequence
So, so many more.  Too many to count.