Testosterone Therapy Increased Fat Loss During Low Calorie Diet in Obese Men with low T

[style=font-weight:bold;]Effects of testosterone treatment on body fat and lean mass in obese men on a hypocaloric diet: a randomised controlled trial.[/style]



Ng Tang Fui M, et al. BMC Med. 2016.



Abstract

BACKGROUND: Whether testosterone treatment has benefits on body composition over and above caloric restriction in men is unknown. We hypothesised that testosterone treatment augments diet-induced loss of fat mass and prevents loss of muscle mass.



METHODS: We conducted a randomised double-blind, parallel, placebo controlled trial at a tertiary referral centre. A total of 100 obese men (body mass index ≥ 30 kg/m(2)) with a total testosterone level of or below 12 nmol/L and a median age of 53 years (interquartile range 47-60) receiving 10 weeks of a very low energy diet (VLED) followed by 46 weeks of weight maintenance were randomly assigned at baseline to 56 weeks of 10-weekly intramuscular testosterone undecanoate (n = 49, cases) or matching placebo (n = 51, controls). The main outcome measures were the between-group difference in fat and lean mass by dual-energy X-ray absorptiometry, and visceral fat area (computed tomography).

RESULTS: A total of 82 men completed the study. At study end, compared to controls, cases had [style=font-weight:bold;]greater reductions in fat mass, with a mean adjusted between-group difference (MAD) of -2.9 kg (-5.7 to -0.2; P&#8201;=&#8201;0.04), and in visceral fat (MAD -2678 mm(2); -5180 to -176; P&#8201;=&#8201;0.04).[/style] Although both groups lost the same lean mass following VLED (cases -3.9 kg (-5.3 to -2.6); controls -4.8 kg (-6.2 to -3.5), P&#8201;=&#8201;0.36), cases regained lean mass (3.3 kg (1.9 to 4.7), P&#8201;<&#8201;0.001) during weight maintenance, in contrast to controls (0.8 kg (-0.7 to 2.3), P&#8201;=&#8201;0.29) so that, at study end, cases had an attenuated reduction in lean mass compared to controls (MAD 3.4 kg (1.3 to 5.5), P&#8201;=&#8201;0.002).



CONCLUSIONS: While dieting men receiving placebo lost both fat and lean mass, the weight loss with testosterone treatment was almost exclusively due to loss of body fat.
 

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