A fish a day may keep the doctor away.

• Position: Dietary Guidelines - Brief article

Government dietary guidelines recommend that people eat fish twice a week, and it is well-known that fish are full of omega-3 fatty acids--which can benefit both heart and brain--but is it safe to eat seafood every day? "For most individuals, it's fine to eat fish every day. It's certainly better to eat fish every day than to eat beef every day," says Eric Rimm, professor of epidemiology and nutrition at the Harvard School of Public Health, Boston, Mass.

However, Rimm questions the supposed added health benefits to that level of consumption. "Most of the science isn't looking at daily consumption, but many, many studies have shown that those who have it a couple of times a week have a lower rate of fatal heart attacks compared to...