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. We should understand that in order to prepare nutritious food, we require only grains, ghee, yogurt and milk. We cannot offer anything else to the Deity. The Vaiṣṇava, the perfect human being, does not accept anything not offered to the Deity. People are often frustrated with national food policies, but from the Vedic scriptures we find that if there are sufficient cows and grains, the entire food problem is solved. The vaiśyas (people engaged in agriculture and commerce) are therefore recommended in the Bhagavad-gītā to produce grains and give protection to cows. Cows are the most important animal because they produce the miracle food, milk, from which we can prepare ghee and yogurt.
Ref >> Srila Prabhupada Vani.