how can we protect ourselves from disease?

Answer 1

Wash your hands.
I work in a hospital and they preach handwashing all of the time.
Your question is a test question on our exams where I work.
We wash our hands between every patient and before and after every procedure.
Never have a pedicure at a public salon. They dont clean them out, especially on a Saturday morning when its busy. They just do one right after another without ever washing out the sinks. Nasty nasty nasty.

Answer 2

take your vitmains and get your 8 hr of sleep. b complex and vitamin c is very important. it boost your immnue system. green tea can prevent stroke and heart attack too