This volume summarizes and interprets twenty scientific articles published between 1949 and 1956. K. Daum and W. W. Tuttle, of the departments of nutrition and physiology of the State University of Iowa College of Medicine, were the principal investigators.
Fifty-four male subjects, aged twelve to eighty-three years, and sixteen women, aged eighteen to twenty-seven years, participated in a series of physiological tests designed to measure work capacity in the late morning hours. Studies of the blood sugar and the utilization of protein, certain minerals, and vitamins were done with twenty-three subjects. The principal variables were no breakfast, coffee only, and two "basic" breakfasts providing twenty-five grams of protein and seven hundred fifty Calories each. One "basic" breakfast was lactovegetarian; the other included bacon and eggs. Except for the twenty-three subjects on balance studies, the diet, other than breakfast, was not controlled. A limited test of the blood sugar in the