It is quite low in calories, providing only 84 calories in a 3-ounce (85-gram) serving, and does not contain any carbs. Approximately 90% of the calories in shrimp come from protein, and the rest come from fat. Additionally, the same serving size provides more than 20 different vitamins and minerals, including 50% of your daily needs for selenium, a mineral that may help reduce inflammation and promote heart health. Shrimp is also one of the best food sources of iodine, an important mineral that many people are deficient in. Iodine is required for proper thyroid function and brain health. Shrimp is also a good source of omega-6 and omega-3 fatty acids, in addition to astaxanthin antioxidants, which may have a variety of health benefits.