I believe disease in on people's mind rather than body. Though there are some body related disease but sickness begins from their mind. When people get nervous then he/she starts to think that he/she is ill and this thinking makes him/her sick.
Once I tried to meditate seriously and collected materials from net like meditation video clips, article etc. Meditation is a great things. Meditation keep mind stable and controlled. It refreshes mind and soul which keeps your body healthy.