Multiple large studies report associations between olive oil and nuts and lower risks in cardiovascular disease, dementia, and some cancers, underscoring their role in nutrition research.The PREDIMED trial linked a Mediterranean diet enriched with extra virgin olive oil to fewer cardiovascular events and reduced cardiovascular mortality. A 2024 Harvard study in JAMA Network Open associated at least half a tablespoon of olive oil daily with lower dementia mortality.Evidence on nuts includes an umbrella review tying 28 grams per day to lower cardiovascular disease risk and the Adventist Health Study linking daily intake to lower mortality.Proposed mechanisms cite polyphenols such as oleocanthal, antioxidants, fiber, and phytochemicals, with studies noting increased satiety without weight gain.
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