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Nutrients 2018, 10(7), 844;

Irisin Serum Levels in Metabolic Syndrome Patients Treated with Three Different Diets: A Post-Hoc Analysis from a Randomized Controlled Clinical Trial

National Institute of Gastroenterology, “Saverio de Bellis” Research Hospital, Via Turi 27, 70013 Castellana Grotte, Italy
Department of Emergency and Organ Transplantation, University of Bari, 70121 Bari, Italy
Department of Basic Medical Science, Neuroscience and Sense Organs, University of Bari, 70121 Bari, Italy
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Received: 24 May 2018 / Revised: 14 June 2018 / Accepted: 26 June 2018 / Published: 28 June 2018
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Background: Irisin, a hormone-like myokine, regulates energy homeostasis and mediates the benefits of physical activity on health. Methods: To estimate the effect of different diets on irisin concentrations in subjects with the Metabolic Syndrome (MetS). Methods: Subjects with MetS were derived from a population survey; 163 subjects were enrolled and randomized to a: Low Glycaemic Index (LGID), Mediterranean (MD) or Low Glycaemic Index Mediterranean (LGIMD) Diet, and the groups were compared, also with 80 controls without MetS. Sociodemographic, medical and nutritional data were collected and fasting blood samples drawn. Subjects underwent LUS and bioimpedentiometry. Generalized Estimating Equations were performed. Results: At baseline, lower irisin concentrations were observed in MetS subjects. Mean irisin levels increased in all diet groups but only the LGID group reached statistical significance, as well as showing an interaction between LGID and time at the sixth month examination (4.57, 95% CI −1.27, 7.87). There was a positive effect of Vegetable Proteins (0.03, 95% CI −0.01,0.06) and Saturated Fatty Acids (0.04, 95% CI 0.01, 0.07) on irisin concentrations. In the LGIMD, a positive effect on Fat-Free Mass (0.38, 95% CI 0.19, 0.57) and a negative effect on the Body Mass Index (−0.75, 95% CI −1.30, −0.19) were observed. Conclusions: There seems to be a link between diet and muscle physiology. We showed that patients following a LGID had higher levels of irisin, a promising biomarker of muscle activity. View Full-Text
Keywords: RCT; irisin; diet; metabolic syndrome RCT; irisin; diet; metabolic syndrome

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Osella, A.R.; Colaianni, G.; Correale, M.; Pesole, P.L.; Bruno, I.; Buongiorno, C.; Deflorio, V.; Leone, C.M.; Colucci, S.C.; Grano, M.; Giannelli, G. Irisin Serum Levels in Metabolic Syndrome Patients Treated with Three Different Diets: A Post-Hoc Analysis from a Randomized Controlled Clinical Trial. Nutrients 2018, 10, 844.

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