Healthy cooking methods that preserve nutrition include steaming, grilling, and baking, as they usually require less oil and retain more vitamins. Boiling can cause nutrient loss, especially in water-soluble vitamins, while frying can add unnecessary fats. Using techniques like sautéing with minimal oil or incorporating raw foods into meals also helps maintain nutritional value. When choosing methods, focus on preserving color, texture, and flavor, providing meals that are both delicious and rich in nutrients.