Olive oil purity confirmed—but climate change threatens future supplies

A recent study has confirmed the high purity of olive oil sold in shops. Out of 216 samples tested, only two failed to meet quality standards. The findings, released in August, also highlighted the oil's well-documented health benefits—from improving heart health to extending lifespan.

Yet rising temperatures and shifting weather patterns are now threatening production. As harvests shrink, prices continue to climb, raising concerns for consumers and producers alike.

The report, led by researcher Tassos Kyriakides, examined 158 extra virgin olive oils and 58 standard olive oils. Backed by the North American Olive Oil Association (NAOOA), it found that adulteration was rare, with just two samples showing signs of tampering. Pure olive oil remains crucial for maximising its health advantages, including raising good HDL cholesterol and lowering harmful LDL levels.

Experts have long praised extra virgin olive oil for its role in cardiovascular health and longevity. Regular consumption, like that of Katerina Karaiskos—who uses it daily—has been linked to reduced risks of heart disease and longer life expectancy. But climate change is putting pressure on the industry. Droughts and heatwaves have cut yields, pushing prices up. Some suggest expanding olive groves to offset these effects, though solutions remain in early stages. The topic will take centre stage at the seventh Yale International Symposium on Olive Oil and Health, running from December 4 to 7 in New Haven. Researchers, producers, and health professionals will gather to discuss sustainability, quality control, and the oil's future in global diets.

The study reassures buyers about olive oil's purity while reinforcing its health perks. Yet climate challenges persist, forcing the industry to adapt. With demand steady and supplies tightening, the coming years will test how producers balance quality, affordability, and environmental pressures.