@cherrie,
												I know.  I think the phrase 
God helps those who help themselves is appropriate.  For sake of argument let's assume there's a benevolent god.  That god gave us the understanding to learn about disease, what causes it, and how to prevent it, therefore we should do just that.
Islam takes it a step further and commands its followers to seek knowledge, which is why Islamic science and medicine was way ahead of that over here until the Renaissance.