New England Journal of Medicine, 2018 · Randomized controlled trial (republished 2018)
A Mediterranean diet supplemented with extra virgin olive oil or nuts cut major cardiovascular events by about 30% compared with a control group advised to reduce dietary fat. The original 2013 report was withdrawn over randomisation problems; this 2018 reanalysis reached the same conclusion.
Always read the original paper for context — effect sizes, study populations and funding sources matter.





