Metabolic diseases and cancers account for half of all mortalities in the world, underscoring the significance of understanding the etiology of these diseases and developing effective therapies. Genomic research in the 21st century has brought cancer and metabolic disease, two once seemingly parallel ailments, as close to each other as they’ve ever been. Many genetic factors have been found to display functions regulating both cancer and metabolic disease. In this research topic: "Double-edged Swords: Genetic Factors That Influence The Pathogenesis of Both MetabolicDisease and Cancer", you will be introduced to individual genes, as well as genetic pathways that play important roles in influencing the progression of both metabolic disease and cancer. By no means covering an exhaustive list of genes qualified, this collection of articles rather serves as a precursor of what is yet to come in biomedical research. It paints the big picture of one of the major fields contributing to the future of “precision medicine”.