Vegetarian Guide to Diet and Salad by Dr. Norman Walker The fundamental purpose of eating is to replenish the chemical elements in the cells and tissues in the body. This book is both a nutritional guide and a cookbook with a wide range of recipes for a balanced natural food diet, particularly relevant for vegetarians. Norman Walker covers the effects of different foods and recommends food combining and colon therapy. The chemical elements in foods - protein, amino acids, milk starches, etc, are clearly explained along with dozens of recipes are supplied.