Low-calorie, rich in proteins, valuable vitamins and minerals, sea fish is an important component of many diets aimed at losing weight and strengthening muscles and bones. Tuna, which enjoys a well-deserved reputation as one of the healthiest and most nutritious fish, is ideally suited for such a diet. Especially if you prepare it in the most gentle way for your figure - bake it in the oven with citrus fruits. Sweet and sour orange juice will soften the dense tuna meat and make the dish light and refreshing.