Shells are a kind of shellfish that looks like a clam, but at a much more expensive price. Its nutritional characteristics are high proteins, high micronutrients, high iron, high calcium and low fat. Many shellfish also have these characteristics. The taste is not only beautiful, but also comprehensive and affordable seafood. It contains various components such as proteins, fats, carbohydrates, iron, calcium, phosphorus, iodine, vitamins, amino acids and cow sulfuric acid, and is an ideal food for low-thermal, high-protein control of chronic diseases among the elderly。