Abstract
Reduced testosterone levels are frequently observed in obese men. Increased aromatase activity may be an etiological factor. In this study, we evaluate the clinical effects of aromatase inhibition in obesity-related hypogonadotropic hypotestosteronemia (OrHH). Double-blind, placebo-controlled, 6-month trial in 42 obese men with a BMI >35 kg/m(2), and a serum total testosterone <10 nmol/l. All patients started on one tablet of 2.5 mg/week, with subsequent dose escalation every month until a serum total testosterone of 20 nmol/l was reached. Psychological function, body composition, exercise capacity, and glucose, lipid, and bone metabolism. Thirty-nine patients completed the study according to protocol. Letrozole decreased serum estradiol from 119.1±10.1 to 59.2±6.1 pmol/l (P<0.001), and increased serum LH from 3.3±0.3 to 8.8±0.9 U/l (P<0.0001) and serum total testosterone from 8.6±0.7 to 21.5±1.3 nmol/l (P<0.0001). Significant effects on the predefined endpoints were not observed. Despite a marked rise in serum testosterone, low-dose aromatase inhibition had no somatic or psychological effects in men with OrHH.
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