A low fat diet is so important and over the past twenty years researchers have acknowledged the importance of shellfish to a nutritious diet. Shellfish such as oysters, clams, scallops, lobster, mussels, crabs, prawns etc. are full of many different vitamins and minerals and they are also low in the amount of fat they contain. Shellfish and a variety of other types of fish are full of omega-3 polyunsaturated acids, which are not produced by the human body but instead must be consumed by way of dietary sources.