Functional foods are utilized for both preventing and curing diabetes mellitus, even though they also include anti-inflammatory, antioxidant, and insulin-sensitivity qualities. Since the disorder is associated with inflammation, oxidative damage, and elevated insulin levels, these nutrients can aid in its management. Some studies emphasize the potential of functional foods and herbs as anti-diabetic medications, especially for type 2 diabetes mellitus (T2DM). Included are the prevalence of type 2 diabetes, its genesis and pathophysiology, complications, conventional treatment regimens, and complementary and alternative therapy. This chapter discusses how combining functional foods and herbs with a conventional hypoglycemic medicine and changing lifestyle choices can significantly improve glycemic control and prevent DM-related issues. Additional clinical interest is needed to determine the safety and efficacy of these treatments, especially in relation to dosage, duration, and mode of administration veggies, lentils, and premium proteins such as grass-fed meats and wild seafood. Mediterranean diets, which prioritize complex carbohydrates, citrus fruits, vegetables, and legumes, support gut health and inflammatory equilibrium while lowering blood sugar, insulin, and cholesterol. Polyunsaturated omega-3 fatty acid-rich foods, such as salmon and walnuts, have beneficial effects on blood pressure, insulin, blood sugar, and triglycerides. A diet devoid of gluten may also benefit those who have diabetes or metabolic syndrome. A diverse, plant-based diet high in dietary fiber supports good digestion, weight, and blood sugar balance. The microbiome has a significant impact on blood sugar balance. Prebiotic foods like garlic, bananas, and asparagus support healthy gut flora, while fermented foods like miso and sauerkraut promote microbial diversity to regulate weight, cholesterol, and insulin sensitivity.