First of all we have to see what is the diet of the human being. Actually, I have read in some scientific magazine, a medical magazine, that our teeth is not meant for eating meats. These teeth are meant for eating fruits. Actually the shape of the teeth is like that, just like sharp knife. You can . . . apple you can take immediately. But if you take one piece of meat, you cannot eat so easily with these teeth.
So first of all you have to understand what is your diet. So your diet is different from animals' diet. You take anything. Even stool is food for a certain animal, but that does not mean I have to eat stool also. Stool may be eatable for a certain type of animal. "Oh, that is not my diet, or food." Similarly, we have to discriminate.
Now so far we are concerned, Kṛṣṇa conscious person—we are studying Kṛṣṇa conscious—what is our diet? Our diet is kṛṣṇa-prasādam, what is offered, as I told you, that something is offered to Kṛṣṇa, then we take. We don't take anything direct. Just like these fruits, we have first of all offered to Kṛṣṇa. Here is a plate. Then we take. That is our system. Even we take vegetables, fruits, we don't take directly. We first of all prepare or cut into pieces, offer to the Deity; then we take. Now, the idea is that we take the remnants of food offered to Kṛṣṇa.
Now, when you offer something to some respectable person, you ask him, "What can I offer you?" If I go to your house, and if you want to offer me something to eat, you will ask me what I wish to eat. That is the etiquette. So similarly, we have to offer Kṛṣṇa what Kṛṣṇa likes to eat. So how we can know? In this book we have the things, what Kṛṣṇa wants. He says: "You give Me foodstuff," patraṁ puṣpaṁ phalaṁ toyaṁ (BG 9.26), "fruits, flowers, grains, milk, like that." So our diet is Kṛṣṇa prasādam.
Therefore . . . Kṛṣṇa wants these things. We prepare these things, and we eat the remnants of food. If Kṛṣṇa says that, "You give me meat," then we can offer Kṛṣṇa meat also. But Kṛṣṇa does not say that. Kṛṣṇa says, "Give Me fruits, flowers, grains." So we have no quarrel with the meat-eaters. Let them do whatever he likes. But our concern is that unless Kṛṣṇa takes, we don't take.
So in order to become Kṛṣṇa conscious, this is necessary, just like an important segment of the work. We cannot accept anything which is not offered to Kṛṣṇa. Therefore this diet, this sort of diet, as you have tasted in our Love Feast, that is important. We cannot take outside the scope. So in that sense, diet is important. Besides that, from health point of view also you require a balanced food—carbohydrate, starch, protein and fat. That is scientific. So fat we are getting from milk, butter.