Patients with tendinitis should be cautious with their diet, avoiding spicy and stimulating foods such as chili peppers and black pepper, as well as high-fat and high-calorie foods like fatty meats and barbecue. They should also avoid foods with a high sugar content, such as sweets that are rich in sugar. These types of foods are detrimental to overall health. Patients with tendinitis should appropriately supplement their diet with foods that are rich in high-quality protein and vitamins. These include milk, eggs, beans, chicken, fish, fresh vegetables, and fruits, all of which are beneficial for health.