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Saptadhatu (seven-tissue) theory is one of the fundamental aspects of Ayurvedic system of medicine. The concept of ojasa is very subtle and fundamental. Ojasa may be defined as and supreme and ultimate essence of Saptadhatu (seven-tissue) starting from rasa (plasma) to sukra (seminal fluid). Ojasa basically refers to the vital and essential energy of the immunity or the immune system. In nutshell, ojasa is chiefly responsible for vitality, immunirty and strength.
Ojas is basically the by-product of an efficient, contented and healthy physiology. Ojas is the essence or juice which remains present after the proper digestion and assimilation of the food-stuffs. When the human body is capable of producing ojas, then all the organs retain vitality and the body is receiving the micro- nutrients and macro-nutrients in optimal strength. When the biological fire or agni is not working in a proper fashion, the body is not in a position to produce ojas. Under these circumstances, food, feelings and thoughts convert into ama.
Ojas of Ayurvedic system of medicine is comparable to the concept of the immune system in modern medicine. Immunity is nothing but the capacity of the human body to fight against diseases. Ancient Ayurveda lexicons and texts written around 5000 years ago describe specific disease resulting from impaired immunity.
As per rule and regulation, food we eat is firstly converted into Rasa. Once there is formation of Rasa, the remaining gets converted into Rakta. Once there is formation of Rakta, the remaining gets converted into Mamsa. Once there is formation of Mamsa, the remaining gets converted into Meda. Once there is formation of Meda, the remaining gets converted into Asthi. Once formation of Asthi is over, the remained gets converted into Majja. Once there is formation of Majja, the remaining gets converted into Shukra.
All the seven element tissues of the body contain their own agni to metabolize the nutrients supplied to them through channels of circulation.
The classic texts of Ayurvedic medicine, describes Ojas as the ashtadhatu (eighth tissue of the human-body). Ojas is mad up of the final essence of saptadhatu. Ojas is also known as dhatusara ojas. Ojas is contsantly under and can be described as the final essence of the biological water, Kapha in the human-body.
While ojas is considered to be subtle, grounded aspects of the same, also exsist (para ojas and apara ojas).
The three pure and energies that underlythe three biological humours are known as the triad of prana, tejas and ojas. According to the yogic school of thought, prana represents the the subtle energy of air or the life force. The main function of prana is to coordinate the process of respiration. Tejas represents the the subtle energy pitta or fire. Tejas represents vitality resulting from correct digestion of food-stuffs. Ojas represents the subtle energy of the biological water or kapha.
The depletion of ojas can occur through physical (loss of nourishment, excessive physical activity and intake of unsuitable foods) and mental factors (depression, anger, fear, worry and sorrow).