The goal of this clinical trial is to learn if a Mediterranean diet can improve gut microbiota, disease activity, and nutrition in children with systemic lupus erythematosus (SLE). The study will include children with SLE and healthy family members living in the same home. The main questions it aims to answer are: Does a Mediterranean diet improve gut microbiota in children with SLE? Does the diet help reduce disease activity? Does the diet improve overall nutrition? Researchers will compare children with SLE to healthy family members to better understand how diet, gut microbiota, and health are related. Participants will: Give stool samples at the beginning and end of the study to analyze gut microbiota. Have body measurements taken. Record what they eat for 3 days (2 weekdays and 1 weekend day). Answer questions about their diet, physical activity, sleep, and health. Children with SLE in the intervention group will receive nutrition counseling based on the Mediterranean diet for 12 weeks. The counseling will focus on increasing foods rich in polyphenols and reducing processed foods to improve overall diet quality. They will also receive advice on physical activity. At the end of the study, some participants will join a group discussion to share their experiences.
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Gut microbiota diversity
Timeframe: Baseline (Week 0) and Week 12
Change in Systemic Lupus Erythematosus Disease Activity Index-2000 (SLEDAI-2K) Score
Timeframe: Baseline and week 12