In a small, randomized trial of diet in 2033 men who had had a previous heart attack, it was found that consuming two servings of 200–400 g of fatty fish per week for two years caused a significant reduction in mortality and nonfatal heart attacks. Because this clinical trial and other surveys show a positive trend for protection from heart attacks, investigators concluded that it is advisable for individuals over age 25 to eat two servings of 175 g (6 oz) of fatty fish weekly. Individuals with a family history of heart attacks before age 60 and those who have had a heart attack should use this simple nondrug protective regimen. Fatty fish include salmon, tuna, mackerel, cod, and herring. Any beneficial effect is obtained with one or two servings of fish per week and more is not better.

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