Whilst it is true that man cannot live without air and water, the thing that nourishes the body is food. Hence the saying, food is life.
Food can be divided into three categories : vegetarian, flesh,and mixed. Flesh foods include fowl and fish. Milk is an animal product and cannot by any means be included in a strictly vegetarian diet. It serves the purpose of meat to a very large extent. In medical language it is classified as animal food. A layman does not consider milk to be animal food. On the other hand, eggs are regarded by the layman as a flesh food. In reality, they are not. Nowadays sterile eggs are also produced. The hen is not allowed to see the cock and yet it lays eggs. A sterile egg never develops into a chick. Therefore, he who can take milk should have no objection to taking sterile eggs.
Medical opinion is mostly in favour of a mixed diet, although there is a growing school, which is strongly of the opinion that anatomical and physiological evidence is in favour of man being a vegetarian. His teeth, his stomach, intestines, etc. seem to prove that nature has meant man to be a vegetarian.
Vegetarian diet, besides grains, pulses, edible roots, tubers and leaves, includes fruits, both fresh and dry. Dry fruit includes nuts like almonds, pistachio, walnut, etc.