As seafood is, literally, any form of sea life that is eaten as food, there are many different types and varieties of it. The two largest categories of seafood are fish and shellfish, and the definition is sometimes expanded to include any freshwater life that is eaten as food.
Seafood, assuming it isn't contaminated - a growing problem - is a healthy type of food. One portion of seafood eaten every week could lower the chances of heart disease and cut the chance of suffering a heart attack in half. Fish can also help with the symptoms of rheumatoid arthritis. Seafood is rich in omega-3 fatty acids. Research is still ongoing into these, but they could help health in general. One way of avoiding contaminated seafood is by eating types that are low on the food chain; the higher up the food chain, the greater the contamination.
Seafood can be prepared in many different ways. It can even be eaten raw, in dishes such as sashimi.
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