Br J Cancer. 2000 Jul; 83(1): 95-7.

Hormones and diet: low insulin-like growth factor-I but normal bioavailable androgens in vegan men.

Allen NE, Appleby PN, Davey GK, Key TJ.

Cancer Epidemiology Unit, Imperial Cancer Research Fund, Radcliffe Infirmary, Oxford, UK.

Mean serum insulin-like growth factor-I was 9% lower in 233 vegan men than in 226 meat-eaters and 237 vegetarians (P = 0.002). Vegans had higher testosterone levels than vegetarians and meat-eaters, but this was offset by higher sex hormone binding globulin, and there were no differences between diet groups in free testosterone, androstanediol glucuronide or luteinizing hormone.