Relationship between obesity, depression and infertility: results from the NHANES 2013-2018 cross-sectional study and a Mendelian randomisation study

Depression is increasingly recognised as a factor affecting infertility but the causal relationship between them remains controversial. The aim of this study was to explore the relationship between depression and infertility using Mendelian randomisation (MR) and a cross-sectional study, and to explore the potential mediating role of obesity.