Agni refers to fire which has its role inside and outside the body1, it's ushna, tikshna, laghu,2 saraadi guna assist for dahana and pachanaadi3 action along with it aids to move everywhere including in minute channels of the body. It maintains the luster and complexion of the skin, energy, work capacity, strength, nutritional process and growth of the body.4 The body is flaming fire and it only refers to the phenomenon of heat which is associated with fire. Agni has the capacity to convert the substance in any form because of its occult power. Maintenance of physiological actions in equilibrium state or heal pathological conditions depends on the normal state of Agni, while the abnormal state of Agni contributes to pathological changes, and absence of Agni results in death of the living being therefore maintenance of human life itself is dependent on Agni.4 Agni is one of the basic constituents which is helpful in the maintenance and growth of the human body.
Sakkari et al. (2025) studied this question.