Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 

 

Fire is appreciated by its light and by its ability to cook, to digest, to destroy cold, to evaporate, and to give rise to hunger, thirst, eating and drinking.

 

Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 

 

The first symptoms of fire are distribution of light and heat, and the existence of fire is also perceived in the stomach. Without fire we cannot digest what we eat. Without digestion there is no hunger and thirst or power to eat and drink. When there is insufficient hunger and thirst, it is understood that there is a shortage of fire within the stomach, and the Ayurvedic treatment is performed in connection with the fire element, agni-mandyam. Since fire is increased by the secretion of bile, the treatment is to increase bile secretion. The Ayurvedic treatment thus corroborates the statements in Srimad-Bhagavatam. The characteristic of fire in subduing the influence of cold is known to everyone. Severe cold can always be counteracted by fire.