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General Health & Fitness
Nutrition and Supplements
Caloric Restriction Increased Testosterone in Overweight Men and Decreased T in Men with Normal Weight
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<blockquote data-quote="Nelson Vergel" data-source="post: 209907" data-attributes="member: 3"><p>Nutr Rev. 2021 Oct 6;nuab072. doi: 10.1093/nutrit/nuab072. Online ahead of print.</p><p></p><p><strong><span style="font-size: 22px">Examining the effects of calorie restriction on testosterone concentrations in men: a systematic review and meta-analysis</span></strong></p><p></p><p>Stephen J Smith 1, Shaun Y M Teo 1, Adrian L Lopresti 1, Brody Heritage 1, Timothy J Fairchild 1</p><p></p><p>Abstract</p><p>Context: Testosterone concentrations decline with age, and lower testosterone concentrations are associated with several morbidities, including sexual dysfunction, obesity, type 2 diabetes mellitus (T2DM), and metabolic syndrome.</p><p></p><p>Objective: Because dietary habits play a critical role in weight regulation and T2DM management, the aim of this systematic review and meta-analysis was to summarize and critically evaluate the evidence from randomized controlled trials to determine the effects of calorie restriction (CR) on testosterone concentrations in men.</p><p></p><p>Data sources: A literature search was conducted across 4 databases, from their inception until March 2020.</p><p></p><p>Data extraction: The screening and data extraction were completed by 2 authors independently, and in a blinded manner, according to a priori inclusion and exclusion criteria.</p><p></p><p>Data analysis: Of the 4198 studies identified from the initial search, 7 randomized controlled trials were included for data extraction. <strong>Significant increases in total testosterone concentrations were reported in 3 of 4 studies in which CR was examined with overweight or obese men, compared with the control groups. Significant decreases in total testosterone concentrations were reported in 2 of 3 studies in which the effects of CR were examined with normal-weight, healthy men, compared with the control groups. In all 4 studies that examined the effect of CR on sex hormone-binding globulin concentrations, the intervention significantly increased sex hormone-binding globulin concentrations compared with that of the control groups irrespective of body composition.</strong></p><p></p><p>Conclusion: This systematic review and meta-analysis provide some evidence that CR affects testosterone concentrations in men and this effect depends on their body mass index. PROSPERO registration no. CRD42020173102.</p><p></p><p>Keywords: SHBG; calorie restriction; male; sex hormone–binding globulin; testosterone.</p></blockquote><p></p>
[QUOTE="Nelson Vergel, post: 209907, member: 3"] Nutr Rev. 2021 Oct 6;nuab072. doi: 10.1093/nutrit/nuab072. Online ahead of print. [B][SIZE=22px]Examining the effects of calorie restriction on testosterone concentrations in men: a systematic review and meta-analysis[/SIZE][/B] Stephen J Smith 1, Shaun Y M Teo 1, Adrian L Lopresti 1, Brody Heritage 1, Timothy J Fairchild 1 Abstract Context: Testosterone concentrations decline with age, and lower testosterone concentrations are associated with several morbidities, including sexual dysfunction, obesity, type 2 diabetes mellitus (T2DM), and metabolic syndrome. Objective: Because dietary habits play a critical role in weight regulation and T2DM management, the aim of this systematic review and meta-analysis was to summarize and critically evaluate the evidence from randomized controlled trials to determine the effects of calorie restriction (CR) on testosterone concentrations in men. Data sources: A literature search was conducted across 4 databases, from their inception until March 2020. Data extraction: The screening and data extraction were completed by 2 authors independently, and in a blinded manner, according to a priori inclusion and exclusion criteria. Data analysis: Of the 4198 studies identified from the initial search, 7 randomized controlled trials were included for data extraction. [B]Significant increases in total testosterone concentrations were reported in 3 of 4 studies in which CR was examined with overweight or obese men, compared with the control groups. Significant decreases in total testosterone concentrations were reported in 2 of 3 studies in which the effects of CR were examined with normal-weight, healthy men, compared with the control groups. In all 4 studies that examined the effect of CR on sex hormone-binding globulin concentrations, the intervention significantly increased sex hormone-binding globulin concentrations compared with that of the control groups irrespective of body composition.[/B] Conclusion: This systematic review and meta-analysis provide some evidence that CR affects testosterone concentrations in men and this effect depends on their body mass index. PROSPERO registration no. CRD42020173102. Keywords: SHBG; calorie restriction; male; sex hormone–binding globulin; testosterone. [/QUOTE]
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Caloric Restriction Increased Testosterone in Overweight Men and Decreased T in Men with Normal Weight
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