Annād bhavanti bhūtāni. If you want to exist, if you want to maintain your body and soul together, then you have to take anna. Anna means foodstuff, or anna means grains, natural food. Generally, anna means foodstuff, and another technical meaning of anna—anna means grains, which is produced from the land for eating of the human being. For human being, so many things are produced from the land: the grains, the fruits, the vegetables, so many things. They are meant for human being. The grains are not meant for the tigers. The grains are meant for the human being. The fruits are meant for the dogs. The fruits are meant for the human being. The milk. The milk is produced by the cow, but it is not meant for the cow. It is meant for the human being. If you offer the milk, 30 pounds of milk, after milking the cow, and if you offer to the cow, it will refuse. It will refuse, "I don't want it." Give it dry grass? Oh, it will be very glad. It will be very glad. So everything is organized by the nature.
Now, there are so many scientists. They are discovering vitamin value from foodstuff. Now, what is the vitamin value in the dry grass? Can any scientist say that this is the vitamin value in dry grass? If there is no vitamin value in dry grass, how the cow is producing so much milk, who is full of vitamins A and D? How, from dry grass, vitamins coming out? Nowadays the physician prescribes some artificial vitamins for maintaining your body. Now, what is the vitamin there in the dry grass so that the cow is eating dry grass and giving you nice milk full of vitamins A and D, essential for your life? So these are all wrong theories, that "This contains this vitamin. This contains this." Let them go on. But natural foodstuff which is meant for human being, they are full of vitamins already there by nature's law, by God's wish. So annād bhavanti bhūtāni (BG 3.14).
You will be surprised. When I was family man, I had a servant who was only twenty-two years old. Oh, he was too stout and strong. You see? So one day I asked him that... His name was Buddhu. So I asked him, "Buddhu, what do you take that you are very stout and strong?" He said, "My dear sir, I take only these corns." Corns. You know corns? A corns and it is powdered. The powdered portions used to make bread, and the grain portion he used to cook as rice, and he was taking that. That's all.