SAUCHA means cleanliness, purification. It implies cleanliness of the body (both inside and outside) and mental purification (eliminating negative thoughts and mental agitation).
SAUCHA comprise six traditional techniques of purification called SHAT KRIYAS.
An important factor of keeping the body and mind clean is the diet. Know that meat brings a lot of toxic substances into your system. Clean and fresh food must be the rule for a health conscious individual.
The way we eat can make a difference too. Chew very well, focus your mind upon the sacred act of eating, make it holy through your awareness about it.