Olive oil experiences a significant decline in polyphenols and other beneficial properties over time, particularly after harvest. The highest polyphenol content occurs immediately post-harvest, leading to maximum health benefits when consumed fresh. The journey from the producer to store shelves can take months, impacting the quality of olive oil available in supermarkets. Typically, new season olive oil should reach consumers by early spring for optimal freshness; otherwise, polyphenol levels can decrease by about half every six months. In contrast, traditional Mediterranean consumption emphasizes using olive oil quickly, ideally within a year to coincide with the next harvest, highlighting the importance of selecting fresh olive oil for the best health benefits.

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