The document discusses proper food and purification of the body through diet for practitioners of yoga. It argues that a vegetarian diet consisting of milk, nuts, grains and other sattvic foods is best for purity of mind and health. Eating meat, eggs and other tamasic foods is considered impure and harmful according to analysis of human characteristics being similar to gentle herbivores rather than carnivores. Purification of the body through proper sattvic food is seen as the first step for spiritual development in the practice of yoga.