How Long Has the Mediterranean Diet Been the Number One Style of Eating for Health, and Why? Where Did It Originate?

If you've scrolled past headlines calling the Mediterranean diet the "world's healthiest way of eating" and wondered whether that's just marketing, you're asking a fair question. Diets come and go every few years. This one hasn't. It's been studied for over seven decades, and it keeps coming out on top, year after year, in reviews by doctors, dietitians and researchers around the world.

So where did it actually come from, and why has it stuck around this long?

What Is the Mediterranean Diet?

So what is the Mediterranean Diet then? The Mediterranean diet isn't really a "diet" in the way most people think of one. There's no calorie counting, no list of forbidden foods, no strict rulebook. It's an eating pattern based on how people living around the Mediterranean Sea, particularly in Greece, southern Italy and parts of Spain, ate for generations before fast food and packaged snacks became the norm.

The pattern is simple at its core. Vegetables, fruit, whole grains, legumes, nuts and olive oil form the base of almost every meal. Fish and seafood show up a couple of times a week. Poultry, eggs and dairy are eaten in smaller, more moderate amounts. Red meats and dessert sweets are saved for special occasions rather than daily habit. Meals are usually shared with other people, eaten slowly, and often paired with a walk afterwards rather than a couch.

That last part matters more than people realise. The traditional Mediterranean way of life was never just about what landed on the plate. It included daily movement, cooking at home, and eating with family or friends rather than alone at a desk.

Where Did the Mediterranean Diet Originate?

The Mediterranean story starts just after World War II with an American physiologist named Ancel Keys. Keys noticed something odd. Wealthy, well-fed executives in the United States were suffering from heart disease at much higher rates than people in poorer parts of southern Europe, who were eating what many Americans at the time would have considered a plain, humble diet.

Keys wanted to know why, so in 1958 he launched what became known as the Seven Countries Study, tracking the diets and health outcomes of roughly 13,000 middle-aged men across the United States, Finland, the Netherlands, Italy, the former Yugoslavia, Greece and Japan. The study ran for decades, with researchers checking in on participants' health every few years.

What Keys found, published through Harvard by 1980, was striking. The men living along the Mediterranean coast of Italy and Greece, eating diets built around olive oil, vegetables, bread, legumes and fish, had dramatically lesser rates of coronary heart diseases than the American participants. Keys became so convinced by his own findings that he moved to a small town on the Italian coast called Pioppi and adopted the eating pattern himself. He lived to be 100.

The roots of the diet actually go back much further than Keys, though. Long before any research existed, ancient Mediterranean cultures were already eating this way out of necessity and tradition, shaped by the crops and seafood available in the region and by philosophies of moderation dating back to figures like Hippocrates. Keys didn't invent the Mediterranean diet. He was the first to prove, with hard data, why it worked.

In 1993, the nonprofit group Oldways partnered with Harvard's School of Public Health and the World Health Organization to turn these findings into something practical: the Mediterranean Diet Pyramid, a visual guide showing what to eat often and what to eat sparingly. In 2010, UNESCO went a step further and listed the Mediterranean diet as an Intangible Cultural Heritage, recognising it as something worth protecting, not just a health trend.

Why Is the Mediterranean Diet Considered the Best?

Ask any dietitian why this particular eating pattern keeps winning "best diet" rankings and the answer usually comes down to evidence. Few diets have been studied as thoroughly or for as long. Large clinical trials, including the well-known PREDIMED study in Spain and the Lyon Diet Heart Study in France, have repeatedly linked the Mediterranean pattern to a leser risk of a heart disease, or a stroke and, of course, type 2 diabetes.

Health organisations have taken notice. The American Heart Association and the American Diabetes Association both recommend it as a pattern that may support heart and metabolic health. It's also been recognised for supporting healthy ageing, which is part of why it consistently earns top marks in categories for best overall diet, and one of the best diets for diabetics and the easiest diet to follow.

There's also a simpler reason it works where other diets fail: people can actually stick to it. So why is the Mediterranean Diet considered the Best? Nobody is asked to give up entire food groups or survive on shakes. You're eating real food, cooked simply, often shared with other people. That kind of eating pattern is far easier to sustain for years rather than weeks.

Is Mediterranean the Best Diet for You?

So is a mediterranean best for you? "Best" is a personal question as much as a scientific one. What the research does show clearly is that this way of eating supports long-term heart health, healthy blood sugar and, for many people, steady and sustainable weight management, without demanding perfection or extreme restriction.

If you're currently managing a health condition or taking medication, it's worth having a quick chat with your doctor or even your dietitian before making big changes to your eating pattern, so that it fits properly with your individual situation.

For most people looking for a healthier, more sustainable way to eat, though, it's hard to find a pattern with more research behind it or an easier entry point than this one.

Frequently Asked Questions

How long has the Mediterranean diet been studied?

Formal research began with Ancel Keys' Seven Countries Study in 1958, meaning it has been studied scientifically for well over 65 years, though the eating pattern itself is far older.

Where does the Mediterranean diet come from originally?

Originally from the traditional eating habits of those countries that border the Mediterranean Sea, especially Greece and the south part of Italy, shaped over centuries by locally available crops, olive oil, and seafood.

Why is the Mediterranean diet ranked number one so often?

It's backed by decades of clinical research linking it to lesser rates of heart disease, stroke and type 2 diabetes, and it's flexible enough that most people can actually stick with it long term.

Is the Mediterranean diet suitable for everyone?

The Mediterranean diet will suit pretty much most healthy adults well, but anyone with an already existing medical problem should check in with their doctor before making significant dietary changes.

Did one person invent the Mediterranean diet?

No, not one single person invented it. A man named Ancel Keys identified and researched it scientifically and thoroughly, but the eating pattern itself developed quite naturally over generations in Mediterranean cultures.

This article is general information and isn't a substitute for personalised medical or dietary advice. If you have a health, please check with your doctor or a qualified dietitian before changing how you eat.

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