Fats
Oils, nuts, fatty acids, and dietary fat quality.
NutsEnergy-dense, and repeatedly associated with living longer anyway.Well supported122 papersOlive oilOne of the few dietary fats with a real randomised trial behind it.Promising but early96 papersOmega-3Lowers triglycerides consistently; the heart-attack question is still open.Mixed findings147 papersSeed oilsThe online case against them is far stronger than the evidence is.Mixed findings61 papers