A devotee therefore eats only prasāda, or foodstuffs offered to the Supreme Lord, and Kṛṣṇa says that when a devotee offers Him foodstuffs from the vegetablekingdom, with devotion, He eats that. A devotee is to offer to Kṛṣṇa foodstuffs prepared from vegetables. If the Supreme Lord wanted foodstuffs prepared from animal food, the devotee could offer this, but He does not order to do that.
(Srimad Bhagavatam-----3:29:15-----purport).

Salilaiḥ refers to any water—whatever is available—but it must be very clear and collected purely. That water can be used. The other paraphernalia, such as flower garlands, fruits and vegetables, should be collected according to the country and according to their availability. Tulasī leaves are very important for satisfying the Lord, so as far as possible an arrangement should be made for growing tulasī leaves.
(Srimad Bhagavatam-----4:8:55-----purport).

Of course, wherever it is possible, one should offer the Deities the best foodstuffs, prepared within the category of fruits and vegetables, cooked or uncooked. The important factor is that the devotee should be regulated (mita-bhuk); that is one of the good qualifications of a devotee. He should not hanker to satisfy the tongue with a particular kind of foodstuff. He should be satisfied to eat whatever prasāda is available by the grace of the Lord.
(Srimad Bhagavatam-----4:8:56-----purport).

"If one offers Me with love and devotion a leaf, a flower, fruit or water, I will accept it." The devotee offers eatables in the form of vegetables, fruits, leaves and water to the arcā-vigraha. The Lord, being bhakta-vatsala, compassionate upon His devotees, accepts these offerings. Atheists may think that the devotees are engaged in idol worship, but the fact is different.
(Srimad Bhagavatam-----4:30:28-----purport).

"If one offers Me with love and devotion a leaf, a flower, fruit or water, I will accept it." Thus there are restrictions for the advanced Āryans. Although the Lord Himself can eat anything and everything, He restricts Himself to vegetables, fruits, milk and so on. This verse thus describes the activities of those who claim to be Āryans.
(Srimad Bhagavatam-----4:30:39-40-----purport).

The devotee should (1) take shelter of a bona fide spiritual master, (2) receive initiation from the spiritual master, (3) serve the spiritual master, (4) inquire and learn love from the spiritual master, (5) follow in the footsteps of holy persons devoted to the transcendental loving service of the Lord, (6) be prepared to give up all kinds of enjoyment and suffer all kinds of miseries for the satisfaction of Kṛṣṇa, (7) live in a place where Kṛṣṇa had His pastimes, (8) be satisfied by whatever is sent by Kṛṣṇa for the maintenance of the body and not hanker for more than that, (9) observe fasting on Ekādaśī day (this occurs on the eleventh day after the full moon and the eleventh day after the new moon. On such days no grains, cereals or beans are eaten; simply vegetables and milk are moderately taken, and the chanting of Hare Kṛṣṇa and reading of scriptures are increased.), (10) show respect to devotees, cows and sacred trees like the banyan tree.
(Teachings of Lord Caitanya).

Others are attracted by eating vegetables, creepers, spinach or milk products, but all for the satisfaction of the tongue's demands. Such eating for sense gratification—including the use of extra quantities of spices like chili and tamarind—is to be given up by Kṛṣṇa conscious persons. The use of pan, haritakī, betel nuts, various spices used in pan-making, tobacco, LSD, marijuana, opium, liquor, coffee and tea is indulged in to fulfill illicit demands. If we can practice accepting only remnants of food offered to Kṛṣṇa, it is possible to get free from māyā's victimization. Vegetables, grains, fruits, milk products and water are proper foods to offer to the Lord, as Lord Kṛṣṇa Himself prescribes. However, if one accepts prasāda only because of its palatable taste and thus eats too much, he also falls prey to trying to satisfy the demands of the tongue.
(Nectar of Instruction).

The word upakaraṇa indicates a variety of foods, such as dhal, vegetables and other varieties of possible dishes that one can eat very nicely with rice. It is not proper, however, for a sannyāsī to eat such palatable dishes. If he did so, he would not be able to control his senses. Śrī Caitanya Mahāprabhu did not encourage sannyāsīs to eat very palatable dishes, for the whole Vaiṣṇava cult is vairāgya-vidyā, as renounced as possible. Caitanya Mahāprabhu also advised Raghunātha dāsa Gosvāmī not to eat very palatable dishes, wear very nice garments or talk on mundane subjects. These things are all prohibited for those in the renounced order.
(Sri Caitanya Caritamrta-----2:3:70-----purport).

Anna, ghṛta, dadhi and dugdha are food grains, ghee, yogurt and milk. Actually these are the basis of all food. Vegetables and fruits are subsidiary. Hundreds and thousands of preparations can be made out of grains, vegetables, ghee, milk and yogurt. The food offered to Gopāla in the Annakūṭa ceremony contained only these five ingredients. Only demoniac people are attracted to other types of food, which we will not even mention in this connection.
(Sri Caitanya Caritamrta-----2:4:93-----purport).