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Background & Aims: This study aimed to analyse the association of sex hormone levels with liver enzyme levels and non‐alcoholic fatty liver disease (NAFLD) in a nationally representative sample of men. Methods: A total of 919 men from the US National Health and Nutrition Examination Study (NHANES) III were included in this cross‐sectional analysis of data from 1988 to 1991. We used existing data on serum total and free testosterone, total and free estradiol, androstanediol glucuronide (AAG) and sex steroid‐binding globulin (SHBG), and estimated their associations with aspartate aminotransferase (AST), and alanine aminotransferase (ALT) and NAFLD, as determined using ultrasound, after adjusting for possible confounders including age, race, smoking, alcohol, physical activity, waist circumference and steroid hormones. Results: Lower total testosterone (TT) and higher free estradiol were associated with higher odds of NAFLD after adjusting for confounders including the other sex hormones. Lower TT was associated with higher odds of elevated AST, but not ALT. Free testosterone, total estradiol, SHBG and AAG were not associated with NAFLD or liver enzymes. Conclusions: This study supports an inverse association between TT concentration and NAFLD in men independent of other sex hormones (SHBG, AAG and estradiol) and known risk factors, such as obesity, age and lifestyle. Exploration of whether TT might be a non‐invasive marker for NAFLD diagnosis is warranted. [ABSTRACT FROM AUTHOR]

Background Recent literature suggests that high circulating vitamin D may increase prostate cancer risk. Although the mechanism through which vitamin D may increase risk is unknown, vitamin D concentration could influence circulating sex steroid hormones that may be associated with prostate cancer; an alternate explanation is that it could be associated with prostate-specific antigen ( PSA) concentration causing detection bias. Objective We examined whether serum vitamin D concentration was associated with sex steroid hormone and PSA concentrations in a cross-sectional analysis of men in the National Health and Nutrition Examination Surveys ( NHANES). Design Testosterone, oestradiol, sex hormone-binding globulin ( SHBG), androstanediol glucuronide, and 25-hydroxyvitamin D (25( OH)D) were measured in serum from men aged 20 and older participating in NHANES III ( n = 1315) and NHANES 2001-2004 ( n = 318). Hormone concentrations were compared across 25( OH)D quintiles, adjusting for age, race/ethnicity, body fat percentage, and smoking. PSA concentration was estimated by 25( OH)D quintile in 4013 men from NHANES 2001-2006. Results In NHANES III, higher testosterone (quintile (Q) 1 = 17·2, 95% confidence interval ( CI) = 16·1-18·6; Q5 = 19·6, 95% CI = 18·7-20·6 nmol/l, P-trend = 0·0002) and SHBG (Q1 = 33·8, 95% CI = 30·8-37·0; Q5 = 38·4, 95% CI = 35·8-41·2 nmol/l, P-trend = 0·0005) were observed with increasing 25( OH)D. Similar results were observed in NHANES 2001-2004. PSA concentration was not associated with serum 25( OH)D ( P-trend = 0·34). Conclusion Results from these nationally representative studies support a positive association between serum 25( OH)D and testosterone and SHBG. The findings support an indirect mechanism through which vitamin D may increase prostate cancer risk, and suggest the link to prostate cancer is not due to PSA-detection bias. [ABSTRACT FROM AUTHOR]

Summary Background Physiologic processes during ageing leading to multi-morbidity and diseases that increase risk of premature death may be influenced by ageing-associated changes in endogenous hormone production. Objective To evaluate the decline in sex steroid hormone levels across age and estimate the number of US men 40+ years old who may have low hormone levels. Design We measured serum testosterone, oestradiol and sex hormone binding globulin by immunoassay in 1351 men 20+ years old in Third National Health and Nutrition Examination Survey. We estimated free hormones by mass action. Results Free testosterone declined most rapidly with age (a 2% decline in geometric mean concentration occurred after ageing 1·3 years), followed by total testosterone (2·4 years), free oestradiol (4·1 years) and total oestradiol (8·1 years). These hormone changes with age translated into 25·0% and 30·2% of men 70+ years old having low total (which we defined as <10·4 n [ABSTRACT FROM AUTHOR]