Beta-carotene, lycopene and lutein are carotenoids found in many colourful vegetables. Because they are fat-soluble, they must enter structures called micelles during digestion before they can be absorbed; fat in the meal supports this step. [Linus Pauling Institute, Oregon State University — Carotenoids]
In a small crossover study of seven people, the same salad was served with dressings containing 0, 6 or 28 grams of canola oil. Post-meal appearance of carotenoids in the blood rose with the amount of fat. This was a very small acute study: it measured absorption after one meal, not long-term clinical benefits. [Brown et al. — Carotenoid bioavailability is higher from salads ingested with full-fat than with fat-reduced salad dressings, American Journal of Clinical Nutrition, 2004]
Two other crossover studies, each with eleven participants, observed greater carotenoid absorption from salsa and salad when avocado or avocado oil was added. Again, the finding concerns bioavailability, not disease prevention or treatment. [Unlu et al. — Carotenoid absorption from salad and salsa by humans is enhanced by the addition of avocado or avocado oil, Journal of Nutrition, 2005]
These experiments did not test EVOO or Cook with Olive Oil. It is reasonable to use extra virgin olive oil as one culinary source of fat alongside vegetables, but this is a practical application of the general mechanism, not proof of a product-specific therapeutic effect. The studies do not establish a magic dose.
At the table, the idea is simple: tomatoes, carrots and leafy greens can be dressed with an amount of EVOO that suits the meal and individual needs. Varying colours and preparations matters more than chasing one nutrient. Sources checked on 12 September 2026; the cited studies are not new publications from today.