You get diseases not from what you eat, but what is eating you

Cleansing the digestive system - http://spirituality.indiatimes.com/articleshow/msid-1392571,curpg-1.cms

This is important because - “You get diseases not from what you eat, but what is eating you”

From the blog - http://hirenshah.wordpress.com/ -
"Some four five years back, my yoga teacher apprised me of a yogic kriya that I was unaware of. It is called laghu shankh prakshalan. He told me that just as a car required servicing twice a year, one was better off with internal cleansing twice a year- at the beginning of winter and summer season. He further stated what I had read in one of Dale Carnegie’s books years back “You get diseases not from what you eat but what is eating you”. The yoga teacher said that in today’s world it was psychosomatic;
could be both ways supplementing each other. Stress could be causing digestion problems and even vice-versa. Reminded me of the percussion instrument dholak which is banged from both sides. Though done through the excretory system, the basic objective is to clean the digestive system. It is also supposed to be very good for a glowing skin."