Cardiologists have long known that eating fish helps protect against heart disease. What they don't know is why fish are beneficial. For years they figured it was a simple question of substitution: folks who replace red meat with fish are naturally cutting down their intake of saturated fat, which the body easily converts into artery-choking plaques. But a growing body of evidence collected over the past 30 years suggests there's something special about fish. In particular, fish contain nutrients called omega-3 fatty acids (especially abundant in species like sardines, salmon and mackerel) that seem to promote cardiovascular health.
One group convinced...
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