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Moderate amounts of fish oil (6 g/day) are unlikely to lower blood pressure in normotensive persons, but may increase HDL2-cholesterol, particularly in women.
The ability of fish meals to increase membrane PUFA content and decrease blood pressure in hypertensive patients depends upon the starting membrane fatty acid composition.
Currently recommended amounts of dietary oily fish intake per week (1–2 servings) might be insufficient to exert beneficial effects of fish in the control of blood pressure.
On the basis of this analysis a potentially adverse effect of dietary fish oil on blood pressure in some individuals is suggested.
Polyunsaturated n-3 fish fatty acids lower blood pressure but only in pharmacological doses that cannot generally be recommended.
6 The results indicate that fish oil feeding may reduce blood pressure by decreasing vascular smooth muscle reactivity to noradrenaline in resistance vessels.
Finally, fish oil has a mild blood pressure-lowering effect in both normal and mildly hypertensive individuals.
Open accessJournal Article
Hagen Yang, Anne M. Kenny 
8 Citations
The overall effect of fish oil has been a small but significant decline in blood pressure, especially in those with hypertension or hypercholesterolemia.
There is a dose-response effect of fish oil on blood pressure of -0.66/-035 mm Hg/g wt-3 fatty acids.

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Benefits of video games?
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