Ligands at Free Fatty Acid Receptor 1 (GPR40).- Ligands at Free Fatty Acid Receptor 2/3 (GPR43)/GPR41.- Ligands at GPR84.- Ligands at Free Fatty Acid Receptor 4 (GPR120).- Homology modelling of FFA receptors.- Sensors for FFA receptors.- Key questions for translation of FFA receptors from pharmacology to medicines.- Polymorphic variation in FFA receptors. Functions and consequences.- The role and future of FFA1 as a therapeutic target.- Gut hormone regulation and secretion via FFA1 and FFA4.- The role of FFA2 and FFA3 in metabolic regulation.- Anti-inflammatory and insulin sensitizing effects of free fatty acid receptors.- Free Fatty Acid receptors and cancer.