Adiponectin and human eating behaviour: a Mendelian randomization study

Awoyemi A. Awofala1, Olusegun Emmanuel Ogundele1, Khalid O. Adekoya2, Samuel Adesayo Osundina3
1Department of Biological Sciences, Tai Solarin University of Education, Ijagun, P.M.B. 2118, Ijebu-Ode, Ogun State, Nigeria
2Department of Cell Biology and Genetics, University of Lagos, Akoka, Lagos State, Nigeria
3Department of Basic Sciences, Babcock University, Ilishan-Remo, Ogun State, Nigeria

Tóm tắt

Abstract Background Adiponectin plays key roles in regulating appetite and food intake. Altered circulating adiponectin levels have been observed in human eating disorders such as anorexia nervosa, bulimia nervosa or binge eating. In addition, an association between circulating adiponectin levels and human eating behaviour (EB) has been reported. Interestingly, a disturbance in eating behaviour is the defining characteristic of human eating disorders. However, it is unknown whether adiponectin is causally implicated in human EB. We therefore aimed to investigate the causal effect of adiponectin on EB. Results Mendelian randomization (MR) analysis estimated the influence of blood adiponectin on EB by combining data on the association of adiponectin gene (ADIPOQ) variants with adiponectin levels and with three EB factors involving disinhibition, restraint and hunger. Using inverse-variance weighted (IVW) regression method and other complementary MR techniques (weighted median regression, MR Egger and weighted modal regression), the MR analysis revealed a broadly consistent evidence that higher blood adiponectin concentration was significantly associated with increased EB factor disinhibition (beta coefficient for IVW regression [βIVW], 3.05; 95% confidence interval [CI] 1.10, 5.00) but non-significantly associated with increased EB factor restraint (βIVW, 0.17; 95% CI − 1.85, 2.18), and increased EB factor hunger (βIVW, 1.63; 95% CI − 0.75, 4.01). Conclusions Overall, our findings indicate a causal role of adiponectin levels in eating disinhibition but not in eating restraint and hunger.

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