A gluten-free diet eliminates gluten, a protein found in wheat, barley, and rye, making it essential for individuals with celiac disease or gluten sensitivity. This diet focuses on naturally gluten-free foods such as fruits, vegetables, meats, fish, dairy, legumes, nuts, and gluten-free grains like rice, quinoa, and corn. Many processed foods are also available in gluten-free versions. By avoiding gluten, individuals can reduce symptoms like digestive discomfort and improve overall health, but it's important to ensure a balanced intake of nutrients when following this diet.