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Friday, July 3, 2015
Fish and shellfish are nutrient-rich foods that are good sources of high quality protein and several vitamins and minerals, such as calcium, phosphorus, iron, copper, vitamin A, vitamin D, and B vitamins. Some fish, such as salmon, trout, and herring, are excellent sources of omega-3 fatty acids, which may play a role in the prevention and treatment of heart disease. The American Heart Association recommends 2 servings of fish per week, as part of a low-fat, heart-healthy diet.
Fish are the main sources of methylmercury, a highly toxic form of mercury that is transformed by bacteria in the water. Almost all fish contain traces of methylmercury, but the exact levels depend on what the fish eat, how long they live, and how high they are in the food chain. In the United States, the Environmental Protection Agency regulates commercial fishing to help ensure that fish meet certain standards for contaminants, including mercury. Each state monitors its waters and issues advisories if contaminants are found.
For most people, the level of mercury in a balanced diet that includes fish is not a health concern. However, high levels of mercury may have harmful effects on the developing brain and nervous systems of unborn babies and young children, potentially causing problems with memory, attention, language, fine motor skills, and visual spatial skills.
A consumer advisory was issued by the Food and Drug Administration (FDA) and the Environmental Protection Agency (EPA) in 2004. If you are a woman who might become pregnant, a pregnant woman, a nursing mother, or a young child, should follow these rules to avoid or limit certain types of fish:
This article originally appeared in Nutri-bytes (May 2007), a service of the University of Cincinnati College of Nursing and was adapted for use on NetWellness with permission.
Last Reviewed: May 02, 2007
Bonnie J Brehm, PhD, RD
Professor of Nursing
College of Nursing
University of Cincinnati