They’re low in calories
One medium shrimp provides about 7 calories, which means a dozen add up to less than 85 calories—roughly 15 less than a 3-ounce chicken breast (about the size of a deck of cards in thickness and width). One jumbo shrimp, the type often served in shrimp cocktail, contains about 14 calories, and a teaspoon of cocktail sauce provides 5, so three jumbo shrimp, each with a teaspoon of cocktail sauce as an appetizer, adds up to less than 60 calories, about 10 less than just one pig in a blanket, and 20 less than two mini empanadas or two mini quiche.
In addition to their water content, shrimp are primarily made of protein. Three ounces of baked or broiled shrimp provides about 20 grams of protein, just a few grams less than that a 3-ounce chicken breast. Each jumbo shrimp provides about 3 grams, and contains very little fat and carbohydrate.