Blue Zones — the five regions of the world with the highest concentrations of centenarians — have been studied extensively by researcher Dan Buettner. The Mediterranean diet, similarly, has generated decades of clinical evidence. When you overlay both, striking commonalities emerge that go beyond any single nutrient or food.
The five Blue Zones
Sardinia (Italy), Okinawa (Japan), Nicoya (Costa Rica), Icaria (Greece), and Loma Linda (California) share certain lifestyle and dietary patterns that appear to contribute to extraordinary longevity. Three of these five — Sardinia, Icaria, and Nicoya — overlap substantially with Mediterranean eating patterns.
What they share
Plant foods are the foundation. In all five Blue Zones and across Mediterranean dietary patterns, vegetables, legumes, whole grains, fruits, nuts, and seeds form the base of daily eating. Meat appears infrequently — a few times per month in some regions, not daily.
Legumes are a dietary staple. Black beans in Nicoya, lentils and chickpeas in Sardinia and Icaria, soybeans in Okinawa. Legumes appear in virtually every Blue Zone diet and are one of the strongest dietary predictors of longevity across multiple epidemiological studies.
Olive oil is the primary fat. Sardinia, Icaria, and the Mediterranean model all center on extra virgin olive oil as the main cooking and dressing fat. Okinawans use similar amounts of plant-based fat from sweet potatoes and tofu.
Moderate, consistent alcohol. Wine — particularly Cannonau, a high-antioxidant Sardinian red — appears in small amounts with meals in several Blue Zones. The pattern is one to two glasses daily with food, not binge consumption.
Minimal processed food. All Blue Zone diets are built on whole, minimally processed ingredients. Ultra-processed foods simply weren’t part of the traditional food environment in any of these regions.
What differs
Fish consumption varies significantly — Okinawans and coastal Sardinians eat fish regularly, while Nicoyans and Seventh-day Adventists in Loma Linda eat little to none. Dairy appears more in Sardinian and Mediterranean patterns; Okinawan traditional diets contain little. These differences suggest that no single food drives longevity — the overall pattern does.
Applying it
You don’t need to live in Sardinia to eat like a centenarian. The practical takeaway: build meals around plants and legumes, use olive oil liberally, eat meat as an occasional side rather than a main, avoid processed foods, and eat with others whenever possible. The social dimension of eating is one of the most underrated longevity factors across all Blue Zone research.