What the research really shows about olive oil, heart health, and longevity — from the PREDIMED trial to Harvard cohort studies, without the hype

A technical report published in Agroportal reveals that olive oil production costs in Portugal range from €2.5 to over €12 per litre. The traditional dryland groves of Trás-os-Montes are the most expensive to run — and the least supported. Here's what that means for producers, buyers and visitors.