Crawfish are a terrific low-calorie food. Crawfish are high in protein, low in fat and contain zero carbohydrates. There are only 327 calories in one whole pound of peeled crawfish, and it takes approximately seven pounds of peeled crawfish to produce one pound of peeled tails. In addition to low-calories, these southern delights contain plenty or iron, vitamin B-6, vitamin B-12, and calcium. Do watch out for the calories in crawfish side accompaniments such as boiled potatoes and corn; these can add extra calories – quickly. Instead try adding low-calorie carrots and mushrooms your next boil to help keep calories low!