They say eating fish can make us smarter. But how smart is it to eat a lot of PCB- or mercury-laden fish?

Make your next trip to the grocery store a fishing expedition. Resolve to eat less red meat this year and switch to seafood instead; excess meat consumption contributes to heart disease, while omega 3-rich fish can actually reduce the risk.

Think it's just an old fishwive's tale that fish is brain food? Recent studies have concluded that regular consumption of fish makes our brains function better. Except, of course, if you're eating too much mercury-laced tuna, which could impair your mental functioning.