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Systemic lupus erythematosus (SLE) is a chronic autoimmune disease characterized by widespread inflammation and organ damage. Studies indicate that diet significantly influences the gut microbiota, which, in turn, affects the immune system. This article explores gut microbiota dysbiosis in SLE patients and potential mechanisms related to dietary interventions and immune function. It highlights specific dietary patterns, such as a high-fibre diet and the Mediterranean diet, that may modulate the diversity and activity of the gut microbiota. The interaction between altered microbiota and immune responses, including the regulation of inflammatory cytokines, intestinal barrier permeability, and autoantibody production is examined. This review highlights the importance of personalized dietary strategies to modulate the diversity and activity of the gut microbiota by enhancing the immune response and potentially mitigating disease progression.

The Mediterranean diet (MedDiet), originating from areas around the Mediterranean Sea, emphasises olive oil, fruits, vegetables, legumes, whole grains, and nuts while limiting red and processed meats. Studies show that higher adherence to the MedDiet reduces mortality risk by 23%. This diet contains essential nutrients and bioactive compounds important for maintaining good health. Prediabetes, characterised by impaired glucose metabolism and insulin resistance, can progress to type 2 diabetes, which increases the risk of diabetes, cardiovascular events, and mortality. Diet plays a crucial role in type 2 diabetes prevention. Healthy fats, antioxidants, high fibre, and low glycemic index foods positively affect prediabetes management by improving insulin sensitivity, regulating blood glucose, reducing inflammation, and aiding weight control. This review explores MedDiet’s molecular mechanisms and potential for prediabetes treatment and glycemic control.