Mediterranean diet

Mediterranean diet. The dietary pattern traditionally followed by populations bordering the Mediterranean Sea, particularly in regions like Crete, Greece, and Southern Italy in the mid-20th century. It is characterized by high consumption of plant-based foods, olive oil as the principal fat, moderate intake of fish and poultry, and low consumption of red meat and dairy. This pattern was first brought to widespread scientific attention through the work of Ancel Keys and the Seven Countries Study.

Definition and components

The core components emphasize abundant daily consumption of vegetables, fruit, whole grains, legumes, nuts, and seeds. Olive oil serves as the primary source of added fat, replacing other fats like butter or margarine. Herbs and spices, such as oregano and rosemary, are used to flavor foods instead of salt. Fish and seafood, including sardines and mackerel, are recommended regularly, while poultry, eggs, and dairy like cheese and yogurt are eaten in moderation. Red meat and sweets are consumed infrequently. Moderate consumption of red wine, typically with meals, is a traditional cultural element in many regions, though not universal.

Health effects

Epidemiological research, notably the Nurses' Health Study and the PREDIMED trial, has consistently associated this pattern with reduced risk of major chronic diseases. Strong evidence supports its role in lowering incidence of cardiovascular disease, type 2 diabetes, and certain cancers like breast cancer. It is also linked to improved cognitive function and a potential reduction in the risk of Alzheimer's disease, as suggested by studies like the Chicago Health and Aging Project. The mechanisms are believed to involve the anti-inflammatory and antioxidant properties of its key foods, beneficial effects on lipid profile and blood pressure, and promotion of a healthy gut microbiota.

Historical and cultural context

The pattern is rooted in the traditional foodways of the Mediterranean Basin, reflecting agricultural practices and culinary traditions shaped by climate and geography. The modern scientific conceptualization stems largely from the work of American physiologist Ancel Keys, who observed low rates of coronary heart disease in regions like Crete and Nicotera during the 1950s. His landmark Seven Countries Study provided early correlational data linking the pattern to cardiovascular health. In 2010, UNESCO recognized it as an Intangible Cultural Heritage of Humanity, citing countries like Spain, Greece, Italy, and Morocco.

Comparison with other dietary patterns

Unlike the DASH diet, which was specifically designed to combat hypertension, this pattern emerged from observed cultural traditions. It shares similarities with other plant-forward patterns but is distinct in its singular emphasis on olive oil as the primary fat source, unlike diets that permit a wider variety of vegetable oils. Compared to a typical Western pattern diet, it contains substantially less processed meat, refined grains, and sugar-sweetened beverages. While both it and a vegetarian diet emphasize plants, the former includes regular, moderate consumption of fish and seafood.

Implementation and guidelines

Several organizations have created models to guide adoption, including the Mediterranean Diet Pyramid developed by the Oldways preservation trust and the Harvard T.H. Chan School of Public Health. Practical guidelines encourage cooking with olive oil, eating vegetables with every meal, and choosing whole grain bread over refined versions. Weekly meal planning should incorporate several servings of fish and legumes while reserving red meat for special occasions. Cultural elements, such as enjoying meals socially and engaging in regular physical activity, are considered integral to the pattern's overall health benefits.

Category:Diets Category:Mediterranean cuisine Category:Nutrition