Fortunately for mussel lovers, there are several types of mussels that are available in the U.S. year round. Mussels are low in calories, high in protein, and are a great source of potassium (an essential nutrient used to maintain fluid and electrolyte balance in the body). They also contain heart-healthy Omega-3 fatty acids. Combine mussels with whole wheat pasta to increase your fiber intake, and voila – you have a complete nutrient-dense meal that your body will thank you for.