In a recent study from McMaster University, researchers found that eating oily fish regularly can help prevent heart disease in high-risk people, such as those who already have heart disease or stroke.
The critical ingredient is omega-3 fatty acids, which was linked to a lower risk of major heart events such as heart attacks and strokes by about a sixth in high-risk people who ate two servings of fish rich in omega-3 each week.
The study is published in JAMA Internal Medicine. One author is Andrew Mente.
The findings were based on data from nearly 192,000 people in four studies, including about 52,000 with heart disease, and is the only study conducted on all five continents.
Previous studies focused mainly on North America, Europe, China and Japan, with little information from other regions.
The team says people at low risk for cardiovascular disease can still enjoy modest protection from heart disease by eating fish rich in omega-3, but the health benefits were less pronounced than those high-risk individuals.
These studies were funded by the Canadian Institutes for Health Research, several different pharmaceutical companies, charities, the Population Health Research Institute and the Hamilton Health Sciences Research Institute.
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