Conceptually human body is made of five elements - Earth, Water, Air, Fire and Ether. These cover all the forces of nature. Earth represents solid structures of the body.
Vitality represents fire.
Ether or space represents the human soul. Deviation from state of balance, leads to accumulation of toxins resulting in diseases. According to Charaksamhita, whenever our five senses lose coordination, this results in imbalance in other body functions. Nature helps in restoration of the balance. The modern lifestyles prevent man from taking care of even minimal health needs, creating greater dependency on drug stores.