2. Fish contains many nutrients, such as protein, fat and minerals. But not all nutrients can be incorporated into the soup during cooking. The nutrients contained in fish soup are usually fat-soluble and water-soluble nutrients, such as vitamin D, cholesterol, vitamin C and so on. Because these nutrients need to be mixed with oil and water before they are dissolved in fish soup.

3. Fish also contains protein and other nutrients, which are usually insoluble in fat but soluble in water. Protein has the property of solidification when heated. During the long-term cooking of fish, a small amount of protein may be mixed into the fish soup, but most of protein will remain in the fish. So the nutrition in fish soup exists not only in fish or soup, but also in fish and soup.