...if they switch to a M̶e̶d̶i̶t̶e̶r̶r̶a̶n̶e̶a̶n̶ vegan diet rich in olive oil, nuts, beans, f̶i̶s̶h̶, fruits, and vegetables,
The authors conclude that people who eat a plant-based/vegan diet—avoiding animal products such as beef, pork, poultry, fish, eggs, cheese, and milk, and reducing their intake of processed foods and refined carbohydrates—will escape, reduce or reverse the development of chronic diseases.
Fish do not actually produce omega-3 fatty acids, but instead accumulate them by consuming either microalgae or prey fish that have accumulated omega-3 fatty acids [...]
All three dietary groups had almost equal facility PROMOTING the growth and clinical appearance of cardiovascular disease in those who at study onset did not have this illness. The single exception was the control group which had a significantly higher stroke rate; however at baseline, they also appeared to have a greater BMI, waist circumference, hypertension, anti hypertensive agents and diuretics suggesting a cohort at greater risk for strokes.
In summary, the most responsible conclusion should be, "We found a significant reduction in stroke in those consuming a Mediterranean diet high in omega‑3 fatty acids when compared to those who were not making significant changes in their diet."