Allergen-free diets are designed to eliminate specific food allergens that can trigger adverse reactions in individuals with food allergies or intolerances. Common allergens include dairy, eggs, nuts, soy, wheat, fish, shellfish, and peanuts. The diet focuses on safe, nutrient-rich alternatives such as fruits, vegetables, whole grains, lean proteins, and safe dairy substitutes to maintain a balanced nutritional profile. It requires careful planning to avoid cross-contamination and ensure that individuals get essential nutrients while avoiding allergens. Allergen-free diets are particularly important for those with severe allergies, as even small traces of an allergen can lead to serious health risks.