An important aspect of ayurveda is the emphasis given to prevention. This is exemplified in the rasayana therapy or the rejunventation therapy. This therapy is given to delay the inevitable consequences of the ageing process. Usually rasayana therapy involves pancakarma procedure followed by administration of drugs. It also involves specific diets and regimens which is called life style modification. This treatment strenghtens the tissues by making them impervious to external or internal damaging factors and thus preventing diseases.