Shrimp is low in calories, contains zero carbs and provides a high amount of protein and healthy fats.  It is also an excellent source of iodine, an important mineral required for proper thyroid function and brain health as well as selenium, a mineral that may help reduce inflammation and promote heart health.  Shrimp is also a good source of omega-6 and omega-3 fatty acids as well as the antioxidant astaxanthin, all of which promote heart health.   It is also high in other nutrients, for example, four ounces of shrimp contains over 75% of the daily value for vitamin B12, over 50% for phosphorous, and over 30% for choline and copper, as well as phosphorus, niacin, zinc, and magnesium.