Fish oil prevents stroke because it contains omega 3 fatty acids. These acids prevent ischemic strokes in 2 ways. Omega 3 fatty acids help lower the amount of LDL (bad cholesterol) in your body. This is the cholesterol that’s responsible for plaque buildup in arteries. When arteries are narrowed by plaque, they are more likely to get blocked by blood clots.
Our bodies produce only a small amount of omega-3 fatty acids, so most of what we need has to come from eating omega-3 fatty acid-rich foods like fish (salmon, tuna, trout, herring, etc.) or from supplements. Omega-3 fatty acids have been shown to protect against cardiovascular disease, particularly heart attack and stroke.
Omega 3 fatty acids also help thin the blood. The acids keep blood platelets from clumping together while the blood is flowing. This lessens the risk of forming blood clots.