What precautions can be taken to prevent the disease?

Depends on disease. I'm not sure if you have a particular disease in mind, but in general eating healthy foods, exercising, not smoking, and getting recommended vaccines and screening tests work the best. A good resource for proven prevention strategies is the iphone app called my health checklist 2012.
Which disease? Since u did not specify any disease , i beleive u r talking in general. Be careful what u eat, eat more fruit and vegetable , exercising and avoiding smoking and all illicit drug use.
The disease? That's a difficult answer given i'm not sure what disease you're referring to - but ....