Ayurveda is an ancient Indian system of medicine that aims to prevent illness and prolong life. It is based on the belief that health results from perfect balance between the body, mind and spirit, and their harmony with nature. Ayurveda views the universe as composed of five elements - air, fire, water, earth and ether - which are present in humans in the form of three doshas or biological energies: vata, pitta and kapha. Ayurvedic practices like panchakarma aim to rid the body of toxins and maintain the balance of doshas through techniques like therapeutic vomiting, purgation, enema and bloodletting.