Mussels are extremely low in calories and very rich in nutrients like zinc. They have more than double the amount of iron found in red meat and more than eight times as much as in cabbage. As a consequence, they feature in many diets, including the GI diet, WeightWatchers, Slimming World and the South Beach diet. Few delicacies provide more zinc, iodine, iron and copper, and they are rich in protein without having too much fat or carbohydrate. Mussels are very versatile and have a wonderful flavor.