850 Am J Clin Nutr 1996;64:850-5. Printed in USA. © 1996 American Society for Clinical Nutrition Effects of dietary fat and fiber on plasma and urine androgens and estrogens in men: a controlled feeding

ABSTRACT We conducted a controlled feeding study to evaluate the effects of fat and fiber consumption on plasma and urine sex hormones in men. The study had a crossover design and included 43 healthy men aged 19-56 y. Men were initially ran-domly assigned to either a low-fat, high-fiber or high-fat, low-fiber diet for 10 wk and after a 2-wk washout period crossed over to the other diet. The energy content of diets was varied to maintain constant body weight but averaged 13.3 MJ (3170 kcal)/d on both diets. The low-fat diet provided 18.8 % of energy from fat with a ratio of polyunsaturated to saturated fat (P:S) of 1.3, whereas the high-fat diet provided 41.0 % of energy from fat with a P:S of 0.6. Total dietary fiber consumption from the low- and high-fat diets averaged 4.6 and 2.0 g- MJ ‘- d ‘, respectively. Mean plasma concentrations of total and sex-hormone-binding-globulin (SHBG)-bound testosterone were 13 % and 15 % higher, respectively, on the high-fat, low-fiber diet and the difference from the low-fat, high-fiber diet was significant for the SHBG-bound fraction (P = 0.04). Men’s daily urinary excretion of testosterone also was 13 % higher with the high-fat, low-fiber diet than with the low-fat, high-fiber diet (P = 0.01). Conversely, their urinary excretion of estradiol and estrone and their 2-hydroxy metabolites were 12-28 % lower with the high-fat, low-fiber diet (P 0.01). Results of this study suggest that diet may alter endogenous sex hormone metabolism in men. Am J Cliii Nutr l996;64: 850-5. KEY WORDS Diet, dietary fats, dietary fiber, estrogen, androgen