Urinary Excretion of 17-Ketosteroids by Normal Young Men During Starvation.∗

Summary The urinary excretion of total, neutral 17-ketosteroids was determined in 10 young men who, over a 6-months period, lost 24% of their original body weight. The reduction in ketosteroid excretion was 30% of the control values. Twelve young men performed hard physical work during 4 days when they received no food. By the fourth day the urinary excretion of 17-ketosteroids was only 31% of the control value. The ketosteroid excretion was not influenced by the hard work since the subjects were trained to it before the start of the fast.