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...commonly eaten fish, if there is any level of mercury where, for an adult [excluding women who are or may become pregnant], the potential risk will be greater than the potential benefit of omega-3s, I haven't seen any study that shows that.... If there is a theoretical limit at which potential harm from mercury might exceed omega-3s, it's probably far higher than what we're seeing now. The idea that you're going to eat a fish meal as an adult and that it's going to give you net cardiovascular harm is just not supported...
...know you want to get to this idea of a balance of risk versus benefit. The evidence suggests that the balance is always toward net benefit. If there were a fish that had almost no omega-3s and had high mercury, then the benefit might be surpassed. But most fish that have mercury tend to be the larger ocean-going fish that also tend to be high in omega-3s...
Shellfish are almost all low in mercury because they don't live very long and they're small: shrimp, lobster, crab, scallops. And shellfish have medium levels of omega-3s, similar to other medium-size fish. Salmon are also good. They're high in omega-3s and low in mercury because they're also short-lived...
Light tuna is low in mercury, compared with white (albacore) or red (bluefin) tuna. On average white tuna has three times the mercury as light tuna. But on average white tuna has three times the omega-3s as light tuna - and all the evidence that we can see suggests that omega-3s have more benefit than mercury has harm...
...danger, particularly for women of childbearing age, for most people the benefits of fish outweigh the risks. Eat modest servings of fish each week--particularly salmon and bluefish--and you may reduce your risk of coronary heart disease 36%. Elsewhere, researchers at Louisiana State University reported that omega-3s can help protect cells in the retina, slowing the damage caused by such blinding diseases as retinitis pigmentosa and macular degeneration...