I am the fire of digestion in the bodies of all living entities, and I join with the air of life, outgoing and incoming, to digest the four kinds of foodstuff.
According to Āyur-vedic śāstra, we understand that there is a fire in the stomach which digests all food sent there. When the fire is not blazing there is no hunger, and when the fire is in order we become hungry. Sometimes when the fire is not going nicely, treatment is required. In any case, this fire is representative of the Supreme Personality of Godhead. Vedic mantras (Bṛhad-āraṇyaka Upaniṣad 5.9.1) also confirm that the Supreme Lord or Brahman is situated in the form of fire within the stomach and is digesting all kinds of foodstuff (ayam agnir vaiśvānaro yo 'yam antaḥ puruṣe yenedam annaṁ pacyate). Therefore since He is helping the digestion of all kinds of foodstuff, the living entity is not independent in the eating process. Unless the Supreme Lord helps him in digesting, there is no possibility of eating. He thus produces and digests foodstuff, and by His grace we are enjoying life. In the Vedānta-sūtra (1.2.27) this is also confirmed. Śabdādibhyo 'ntaḥ pratiṣṭhānāc ca: the Lord is situated within sound and within the body, within the air and even within the stomach as the digestive force. There are four kinds of foodstuff—some are drunk, some are chewed, some are licked up, and some are sucked—and He is the digestive force for all of them.
(Bhagavad-Gita-----15:4-----purport).

Although the reflectory energy of the Lord displays various illusions to the eyes of persons with a poor fund of knowledge, the sane person knows clearly that the Lord can act, even from far, far beyond our vision, by His different energies, just as fire can diffuse heat and light from a distant place. In the medical science of the ancient sages, known as the Āyur-veda, there is definite acceptance of the Lord s supremacy in the following words:
jagad-yoner anicchasya
cid-ānandaika-rūpiṇaḥ
puṁso 'sti prakṛtir nityā
praticchāyeva bhāsvataḥ
acetanāpi caitanya-
yogena paramātmanaḥ
akarod viśvam akhilam
anityam nāṭakākṛtim
There is one Supreme Person who is the progenitor of this cosmic manifestation and whose energy acts as prakṛti, or the material nature, dazzling like a reflection. By such illusory action of prakṛti, even dead matter is caused to move by the cooperation of living energy of the Lord, and the material world appears like a dramatic performance to the ignorant eyes. The ignorant person, therefore, may even be a scientist or physiologist in the drama of prakṛti, while the sane person knows prakṛti as the illusory energy of the Lord. By such a conclusion, as confirmed by the Bhagavad-gītā, it is clear that the living entities are also a display of the Lord's superior energy (parā prakṛti), just as the material world is a display of the Lord's inferior energy (aparā prakṛti).
(Srimad Bhagavatam-----2:9:34-----purport).

Those who do not believe in the existence of the ocean of milk because they have experience only of the salty water in the ocean should know that the world is also called the go, which means the cow. The urine of a cow is salty, and according to Āyur-vedic medicine the cow's urine is very effective in treating patients suffering from liver trouble. Such patients may not have any experience of the cow's milk because milk is never given to liver patients. But the liver patient may know that the cow has milk also, although he has never tasted it. Similarly, men who have experience only of this tiny planet where the saltwater ocean exists may take information from the revealed scriptures that there is also an ocean of milk, although we have never seen it. From this ocean of milk the moon was born, but the fish in the milk ocean could not recognize that the moon. was not another fish and was different from them. The fish took the moon to be one of them or maybe something illuminating, but nothing more. The unfortunate persons who do not recognize Lord Kṛṣṇa are like such fish.
(Srimad Bhagavatam-----3:2:8-----purport).

Sexual intercourse in which the husband is attracted to the wife is sure to produce a male child, but sexual intercourse based on attraction of the wife for the husband may produce a girl. That is mentioned in the Āyur-veda. When the passion of the woman is greater, there is a chance of a girl's being born. When the passion of the man is greater, then there is the possibility of a son. Devahūti wanted the passion of her husband to be increased by the arrangement mentioned in the kāma-śāstra. She wanted him to instruct her in that way, and she also requested that he arrange for a suitable house because the hermitage in which Kardama Muni was living was very simple and completely in the mode of goodness, and there was less possibility of passion's being aroused in his heart.
(Srimad Bhagavatam-----3:23:11-----purport).

They then decorated her with very excellent and valuable jewels, which shone brightly. Next they offered her food containing all good qualities, and a sweet, inebriating drink called āsavam.
Āsavam is an Āyur-vedic medical preparation; it is not a liquor. It is especially made from drugs and is meant to improve metabolism for the healthy condition of the body.
(Srimad Bhagavatam-----3:23:29-----translation and purport).

Devahūti was too sexually excited, and therefore she discharged more ova, and nine daughters were born. It is said in the smṛti-śāstra as well as in the Āyur-vedathat when the discharge of the male is greater, male children are begotten, but when the discharge of the female is greater, female children are begotten. It appears from the circumstances that Devahūti was more sexually excited, and therefore she had nine daughters at once. All the daughters, however, were very beautiful, and their bodies were nicely formed; each resembled a lotus flower and was fragrant like a lotus.
(Srimad Bhagavatam-----3:23:48-----purport).

We can perceive the action of the air when the branches of a tree move or when dry leaves on the ground collect together. Similarly, it is only by the action of the air that a body moves, and when the air circulation is impeded, many diseases result. Paralysis, nervous breakdowns, madness and many other diseases are actually due to an insufficient circulation of air. In the Āyur-vedic system these diseases are treated on the basis of air circulation. If from the beginning one takes care of the process of air circulation, such diseases cannot take place. From the Āyur-veda as well as from the Śrīmad-Bhāgavatam it is clear that so many activities are going on internally and externally because of air alone, and as soon as there is some deficiency in the air circulation, these activities cannot take place. Here it is clearly stated, netṛtvaṁ dravya-śabdayoḥ. Our sense of proprietorship over action is also due to the activity of the air. If the air circulation is stifled, we cannot approach a place after hearing. If someone calls us, we hear the sound because of the air circulation, and we approach that sound or the place from which the sound comes. It is clearly said in this verse that these are all movements of the air. The ability to detect odors is also due to the action of the air.
(Srimad Bhagavatam-----3:26:37-----purport).

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 Āyur-vedic treatment is performed in connection with the fire element, agni-māndyam. Since fire is increased by the secretion of bile, the treatment is to increase bile secretion. TheĀyur-vedic treatment thus corroborates the statements in Śrīmad-Bhāgavatam. The characteristic of fire in subduing the influence of cold is known to everyone. Severe cold can always be counteracted by fire.
(Srimad Bhagavatam-----3:26:40-----purport).

Blood veins are compared to rivers; when the veins were manifested in the universal form, the rivers in the various planets were also manifested. The controlling deity of the rivers is also the controlling deity of the nervous system. In Āyur-vedic treatment, those who are suffering from the disease of nervous instability are recommended to take a bath by dipping into a flowing river.
(Srimad Bhagavatam-----3:26:59-----purport).

The ocean is considered to be the presiding deity of the abdomen, where the feelings of hunger and thirst originate. When there is an irregularity in hunger and thirst, one is advised, according to Āyur-vedic treatment, to take a bath in the ocean.
(Srimad Bhagavatam-----3:26:60-----purport).

By practicing the process of prāṇāyāma, one can eradicate the contamination of his physiological condition, and by concentrating the mind one can become free from all sinful activities. By restraining the senses one can free himself from material association, and by meditating on the Supreme Personality of Godhead one can become free from the three modes of material attachment.
According to Āyur-vedic medical science the three items kapha, pitta and vāyu (phlegm, bile and air) maintain the physiological condition of the body. Modern medical science does not accept this physiological analysis as valid, but the ancient Āyur-vedic process of treatment is based upon these items. Āyur-vedic treatment concerns itself with the cause of these three elements, which are mentioned in many places in the Bhāgavatam as the basic conditions of the body. Here it is recommended that by practicing the breathing process of prāṇāyāma one can be released from contamination created by the principal physiological elements, by concentrating the mind one can become free from sinful activities, and by withdrawing the senses one can free himself from material association.
(Srimad Bhagavatam-----3:28:11-----translation and purport).

Because she was always in trance in transcendental bliss, the thought of the Personality of Godhead was always carefully fixed in her mind. She did not become thin, for she was taken care of by the celestial maidservants created by her husband. It is said, according to the Āyur-vedic medical science, that if one is free from anxieties he generally becomes fat. Devahūti, being situated in Kṛṣṇa consciousness, had no mental anxieties, and therefore her body did not become thin. It is customary in the renounced order of life that one should not take any service from a servant or maid, but Devahūti was being served by the celestial maidservants. This may appear to be against the spiritual concept of life, but just as fire is still beautiful even when surrounded by smoke, she looked completely pure although it seemed that she was living in a luxurious way.
(Srimad Bhagavatam-----3:33:28-----purport).

According to Āyur-vedic treatment, it is said that if one has a high fever, someone should splash him with water after gargling this water. In this way the fever subsides. Although Bharata Mahārāja was very aggrieved due to the separation of his so-called son, the deer, he thought that the moon was splashing gargled water on him from its mouth and that this water would subdue his high fever, which was raging due to separation from the deer.
(Srimad Bhagavatam-----5:8:25-----purport).

Maya Dānava, for example, is mentioned here as mahā-yogī, a great mystic, but his business was to help the asuras. Nowadays we are actually seeing that there are some yogīs who cater to the senses of materialists, and there are imposters who advertise themselves as God. Maya Dānava was such a person, a god among the demons, and he could perform some wonderful feats, one of which is described here: he made a well filled with nectar and dipped the asuras into that nectarean well. This nectar was known as mṛta-sanjīvayitari, for it could bring a dead body to life. Mṛta-sanjīvayitari is also an Āyur-vedic preparation. It is a kind of liquor that invigorates even a person on the verge of death.
(Srimad Bhagavatam-----7:10:59-----purport).

Modern medical science has not yet discovered how to bring a dead body back to life or bring youthful energy to an old body, but from these verses we can understand that such treatment is possible if one is able to take knowledge from the Vedic information. The Aśvinī-kumāras were expert in Āyur-veda, as was Dhanvantari. In every department of material science, there is a perfection to be achieved, and to achieve it one must consult the Vedic literature. The highest perfection is to become a devotee of the Lord. To attain this perfection, one must consult Śrīmad-Bhāgavatam, which is understood to be the ripe fruit of the Vedic desire tree (nigama-kalpa-taror galitaṁ phalam (S.B.1:1:3).
(Srimad Bhagavatam-----9:3:11-----purport).

Nima wood is so antiseptic that the Āyurvedic science uses it to cure leprosy. Medical scientists have extracted the active principle of the nima tree, which is called margosic acid. Nima is used for many purposes, especially to brush the teeth. In Indian villages ninety percent of the people use nima twigs for this purpose. Because of all the antiseptic effects of the nima tree and because Lord Caitanya was born beneath a nima tree, Sītā Ṭhākurāṇī gave the Lord the name Nimāi.
(Sri Caitanya Caritamrta-----1:13:117-----purport).

According to Āyur-vedic treatment, the entire physiological system is conducted by three elements, namely vāyu, pitta and kapha (air, bile and mucus). Secretions within the body transform into other secretions like blood, urine and stool, but if there are disturbances in the metabolism, the secretions turn into kapha (mucus) by the influence of the air within the body. According to the Āyur-vedic system, when the secretion of bile and formation of mucus disturb the air circulating within the body, fifty-nine varieties of diseases may occur. One such disease is craziness.
(Sri Caitanya Caritamrta-----1:17:7-----purport).

Brāhmaṇas generally used to become astrologers, Āyur-vedic physicians, teachers and priests. Although highly learned and respectable, such brāhmaṇas went from door to door to distribute their knowledge. A brāhmaṇa would first go to a householder's home to give information about the functions to be performed on a particular tithi, or date, but if there were sickness in the family, the family members would consult the brāhmaṇa as a physician, and the brāhmaṇa would give instruction and some medicine. Often, since the brāhmaṇas were expert in astrology, people would also be greatly inquisitive about their past, present and future.
(Sri Caitanya Caritamrta-----1:17:103-----purport).