Research question · MediterraneanPublished 7 October 2026
What Is the Mediterranean Diet?
The Mediterranean diet is usually described as a healthy pattern built around vegetables, legumes, grains, nuts, fish and olive oil. That description is useful. It is also the end product of a much longer story.
The short answer
The Mediterranean diet is a modern nutritional model derived from food patterns observed in parts of the Mediterranean, particularly Crete, Greece and southern Italy during the mid-twentieth century.
Research has produced substantial evidence for benefits of Mediterranean-style dietary patterns, especially in cardiovascular health. But there was never one uniform Mediterranean cuisine, and the populations from which the model emerged were also shaped by agriculture, work, seasonality, religion, food access, social life and local infrastructure.
Understanding the Mediterranean diet therefore requires two questions: what does the modern dietary pattern contain, and what was happening in the places from which that pattern was abstracted?
The familiar definition
In modern nutrition, the Mediterranean diet generally describes a dietary pattern high in plant foods, legumes, grains, nuts and olive oil; moderate in fish and other foods; and lower in some forms of meat and highly processed food.
The important word is pattern.
Some of the strongest research on Mediterranean-style eating has found associations with the overall dietary pattern even when individual components were much less informative on their own.
The model most people recognize today was formalized gradually. A 1995 scientific description of the Mediterranean diet pyramid explicitly based its reference pattern on Crete, much of Greece and southern Italy around the early 1960s. It also included regular physical activity associated with daily life.
This was already something more specific than “food eaten around the Mediterranean.”
Is there really one Mediterranean diet? →
Before the pyramid
One important thread begins in Crete.
In 1948, a Rockefeller Foundation survey examined hundreds of Cretan households as part of a much broader investigation into living conditions on the island. Food was only one part of the study.
Researchers also documented agriculture, household production, roads, work, housing, income, cooking, transport and other features of daily life.
Later nutrition research would make the Cretan food pattern famous. But the original investigation encountered it inside a functioning, if economically difficult, regional system.
That distinction matters historically even before we decide what it means.
What did people in Crete actually eat? →
From observation to model
During the 1950s, Ancel Keys and other researchers began investigating differences in coronary disease across populations. The work eventually developed into the Seven Countries Study.
Over the following decades, observations from Mediterranean populations became increasingly portable.
Ancel and Margaret Keys published How to Eat Well and Stay Well the Mediterranean Way in 1975.
In 1993, researchers and public-health advocates gathered to create a clearer way of communicating the dietary pattern. A long description was difficult to transmit, so the characteristics were compressed into a food pyramid.
That pyramid helped turn observations made in particular places into a model that could travel almost anywhere.
Who invented the Mediterranean diet? →
Is it healthy?
There is good reason the Mediterranean diet became influential.
Observational studies in Greece associated greater adherence to Mediterranean-style dietary patterns with lower mortality.
The Lyon Diet Heart Study moved the evidence beyond cross-cultural observation by testing a Mediterranean-style intervention after myocardial infarction.
PREDIMED later tested Mediterranean dietary interventions in more than 7,000 high-risk adults in Spain and found lower incidence of major cardiovascular events in the intervention groups. The study also has an important methodological history: the original 2013 publication was withdrawn and a revised analysis was published in 2018 after irregularities in randomization procedures were disclosed.
The evidence deserves to be taken seriously without making it simpler than it is.
Is the Mediterranean diet healthy? →
But “Mediterranean” does not describe one cuisine
Spain is not Greece. Crete is not southern Italy. Coastal food systems are not mountain food systems. Diets also change over time.
Researchers have documented substantial differences among Mediterranean countries even while identifying recurring features such as high consumption of cereals, vegetables and fruits, lower meat intake and greater use of vegetable fats.
The global phrase the Mediterranean diet therefore describes a scientific and cultural model, not a literal inventory of everything Mediterranean people traditionally ate.
A diet, or something larger?
Nutrition science generally uses “Mediterranean diet” to describe a dietary pattern that can be measured and tested.
UNESCO uses the same phrase much more broadly.
Its cultural-heritage definition includes skills, knowledge, rituals, production, harvesting, fishing, animal husbandry, conservation, processing, cooking, communal eating, markets, territory, biodiversity and transmission between generations.
The two definitions are not necessarily contradictory.
They are looking at different levels of the same historical object.
Is the Mediterranean diet a diet or a lifestyle? →
The question behind this project
Before It Was a Diet follows the olive across five centuries, from Andalucía to Peru, and follows a second transformation in the opposite direction: the movement from Mediterranean foodways to a global health prescription.
The research published here does not assume that modern Mediterranean-diet advice is wrong.
It asks a prior question:
What existed before it became advice?
That investigation leads through agriculture, water, labor, trade, households, science, measurement, health research and the changing meaning of the word diet itself.
The book will make the larger argument.
These pages document the evidence underneath it.
About sourcing, uncertainty, and corrections: Research Standards
Continue the investigation
Frequently asked questions
Is the Mediterranean diet healthy?
Yes. Several important observational and intervention studies support cardiovascular benefits and associate greater adherence with lower mortality. The strength of the evidence varies by outcome, and not every association establishes causation.
Is there one Mediterranean diet?
No. Mediterranean food cultures vary substantially by geography and period. The modern health model was constructed from selected patterns, especially those observed in Crete, Greece and southern Italy.
Who invented the Mediterranean diet?
No one invented Mediterranean foodways. The modern health construct developed through twentieth-century surveys, epidemiology, popularization and public-health communication.
Is the Mediterranean diet a lifestyle?
In nutrition research, the term usually describes a measurable eating pattern. UNESCO's cultural definition is broader and includes production, cooking, communal eating, traditions, landscapes and knowledge passed between generations.