A comprehensive review of the triangular relationship among diet, gut microbiota, and inflammation is presented. The human gut microbiota, a complex community of microorganisms, plays a critical role in digestion, metabolism, and immune function. Diet significantly influences the composition and functionality of the gut microbiota, which in turn affects inflammatory pathways. Beneficial dietary patterns, such as the Mediterranean diet (MD) and plant-based diets, promote a diverse and balanced gut microbiota, supporting anti-inflammatory pathways. Conversely, the Western diet (WD), high in saturated fats and refined sugars, is associated with dysbiosis and increased inflammation. The review explores how dietary components influence the gut microbiota, how these microbial changes affect inflammatory pathways, and the therapeutic implications of modulating this axis for chronic inflammatory disease prevention and management. The interplay between diet, gut microbiota, and inflammation is mediated through several mechanistic pathways. Dietary components directly influence the composition and activity of the gut microbiota, which produce metabolites that modulate immune responses and inflammation. The review also discusses the impact of different dietary patterns on the gut microbiota, including the MD, WD, and vegetarian diets, highlighting their effects on microbial diversity and inflammatory processes. The role of macronutrients, such as carbohydrates, fats, and proteins, on gut microbiota composition is also examined, as well as the impact of micronutrients and phytochemicals. The review emphasizes the importance of a balanced diet in maintaining a healthy gut microbiota and preventing chronic inflammatory diseases.A comprehensive review of the triangular relationship among diet, gut microbiota, and inflammation is presented. The human gut microbiota, a complex community of microorganisms, plays a critical role in digestion, metabolism, and immune function. Diet significantly influences the composition and functionality of the gut microbiota, which in turn affects inflammatory pathways. Beneficial dietary patterns, such as the Mediterranean diet (MD) and plant-based diets, promote a diverse and balanced gut microbiota, supporting anti-inflammatory pathways. Conversely, the Western diet (WD), high in saturated fats and refined sugars, is associated with dysbiosis and increased inflammation. The review explores how dietary components influence the gut microbiota, how these microbial changes affect inflammatory pathways, and the therapeutic implications of modulating this axis for chronic inflammatory disease prevention and management. The interplay between diet, gut microbiota, and inflammation is mediated through several mechanistic pathways. Dietary components directly influence the composition and activity of the gut microbiota, which produce metabolites that modulate immune responses and inflammation. The review also discusses the impact of different dietary patterns on the gut microbiota, including the MD, WD, and vegetarian diets, highlighting their effects on microbial diversity and inflammatory processes. The role of macronutrients, such as carbohydrates, fats, and proteins, on gut microbiota composition is also examined, as well as the impact of micronutrients and phytochemicals. The review emphasizes the importance of a balanced diet in maintaining a healthy gut microbiota and preventing chronic inflammatory diseases.