The author explains in definite and simple terms, on grounds of health, economy, ecology, ethics and spirituality, why the vegetarian diet is best for humans. He quotes numerous medical and other authorities of his time to show how unnecessary it is to slaughter millions of animals and birds for food, and what effect the killing and consumption of flesh has on the physical, emotional and mental nature of the persons involved. 

The arguments put forth in this book in favour of vegetarianism are finding more and more support in the present day.