Brenda Khan
The Mediterranean diet was first proposed in 1975 by American biologist Ancel Keys and chemist Margaret Keys. The diet was inspired by the eating habits and traditional food of Crete, Greece, and southern Italy, as observed in the early 1960s. The Keys studied the association between dietary habits and chronic diseases, and their research concluded that the Mediterranean diet offered extended health benefits, including a reduced risk of cardiovascular disease. Since then, the Mediterranean diet has gained recognition from the medical community and has been included in modern nutrition guidelines as a recommended healthy dietary pattern.
| Characteristics | Values |
|---|---|
| First proposed | 1975 by American biologist Ancel Keys and chemist Margaret Keys |
| Inspiration | Eating habits and traditional food of Crete, Greece, and southern Italy in the early 1960s |
| Recognition | Recognized as an Intangible Cultural Heritage of Humanity by UNESCO in 2010 |
| Health benefits | Reduction in all-cause mortality, lowers the risk of heart disease, weight loss, reduced risk of cardiovascular diseases, overall cancer incidence, neurodegenerative diseases, diabetes, and early death |
| Food emphasis | Plant-based foods, vegetables, fruits, whole grains, legumes, nuts, seeds, fish, extra virgin olive oil, moderate dairy and meat |
| Cardiovascular disease | A 2013 Cochrane review found limited evidence of a positive effect, while a 2019 review found uncertainty; other reviews suggest a positive effect, particularly in lowering Apolipoprotein B |
| Cardiovascular protection | Multiple large-scale clinical studies showed a marked reduction of atherosclerotic clinical events in populations with a Mediterranean diet |
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What You'll Learn
The diet's ancient origins
The Mediterranean diet is inspired by the eating habits and traditional food of Crete, Greece, and southern Italy, as observed in the early 1960s. The diet was first proposed in 1975 by American biologist Ancel Keys and chemist Margaret Keys. However, its origins lie in the ancient civilizations that developed around the Mediterranean Basin.
The Mediterranean diet is characterized by a high consumption of vegetables, fruits, grains, legumes, fish, eggs, and nuts, with a moderate intake of meat, oil, and wine. Olive oil is the principal source of fat, and red wine is consumed in low to moderate quantities. This diet is distinct from Mediterranean cuisine, which covers the diverse culinary traditions of various Mediterranean countries, and from the Atlantic diet of northwestern Spain and Portugal.
The ancient origins of the Mediterranean diet can be traced back to the food cultures of ancient civilizations around the Mediterranean Basin. This diet is the result of a complex and multi-millennial interaction between the natural food resources available in the Mediterranean environment and the human element inhabiting the region. The dietary habits inherited by traditional Mediterranean populations, especially in Greece and Southern Italy, are associated with a reduced risk of cardiovascular disease and other chronic diseases.
The success of the Mediterranean diet lies in its composition, which is rich in plant-based foods and healthy fats, while also providing a varied and balanced diet. This combination of taste and health has made it a popular and effective model for improving overall health and reducing the risk of various diseases. The Mediterranean diet has been recognized by the medical community for its health benefits, and it is recommended as a means of improving cardiovascular health and reducing the risk of other chronic diseases.
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Modern discovery by Ancel Keys
The Mediterranean diet was first proposed in 1975 by American biologist Ancel Keys and chemist Margaret Keys. However, Keys' interest in the diet began much earlier, in the 1950s, when he first identified the traditional Mediterranean diet and associated it with a low risk of coronary heart disease (CHD).
Keys' interest in the Mediterranean diet was sparked by his observations of the eating habits and traditional foods of Italy, former Yugoslavia, and Greece. He noticed that the diet in these countries was characterized by a large intake of bread, cereals, vegetables, fruit, and olive oil, with a small intake of meat, milk, dairy, and sugar products. This diet was notably distinct from Mediterranean cuisine, which covers the diverse culinary traditions of various Mediterranean countries, and from the Atlantic diet of northwestern Spain and Portugal.
Keys conducted several pilot studies in various countries to investigate serum cholesterol levels, local rates of heart attacks, and local eating habits. His research culminated in the publication of two books on healthy diets, written in collaboration with his wife, Margaret Keys, in 1959 and 1963. These books summarized their preliminary explorations, investigating serum cholesterol levels, local rates of heart attacks, and local eating habits, and provided insights into the possible determinants of CHD, including eating habits and nutrition science.
Keys also started and coordinated the Seven Countries Study, which examined the relationship between diet, lifestyle, risk factors, and rates of CHD and all-cause mortality in contrasting populations. The study included 16 cohorts of middle-aged men in seven countries: the United States, Finland, the Netherlands, Italy, former Yugoslavia, Greece, and Japan. It assessed their usual eating habits, conducted medical examinations, and followed up with them long-term. The results of this study generated an incredible amount of information, with hundreds of peer-reviewed publications, and confirmed the health benefits of the Mediterranean diet.
The identification of the Mediterranean diet by Keys represented a milestone in the history of nutrition, as it was the first traditional food practice to receive such recognition. Keys has been described as "a giant in physiology, nutrition, and public health", and his work has stimulated ongoing interest and awareness of the Mediterranean diet, with seminars and research initiatives continuing to this day.
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Health benefits and scientific studies
The Mediterranean diet was first proposed in 1975 by American biologist Ancel Keys and chemist Margaret Keys. It was inspired by the eating habits and traditional food of Crete, Greece, and southern Italy in the early 1960s. The diet emphasizes plant-based foods, particularly unprocessed cereals, legumes, vegetables, and fruits, with moderate consumption of fish and dairy, and low consumption of red meat. Olive oil is the principal source of fat.
The Mediterranean diet has been associated with numerous health benefits and has been the subject of various scientific studies. Here are some of the key findings:
Reduction in All-Cause Mortality and Risk of Chronic Diseases: The Mediterranean diet has been linked to a reduction in all-cause mortality in observational studies. A 2017 review found that it lowers the risk of heart disease and early death. A 2023 review specifically looked at the impact of a Mediterranean-type diet on women, finding evidence of reduced mortality and cardiovascular disease risk.
Cardiovascular Health: The diet is particularly known for its potential benefits in reducing the risk of cardiovascular diseases. A 2013 Cochrane review and subsequent reviews provided evidence that the Mediterranean diet can positively impact cardiovascular risk factors, such as lowering the risk of hypertension and other cardiovascular diseases. The American Heart Association has discussed the Mediterranean diet as a healthy dietary pattern for heart health.
Weight Loss: The Mediterranean diet may contribute to weight loss, with some studies indicating similar weight loss results compared to other diets. The inclusion of plant-based foods and healthy fats, such as olive oil, may promote a healthy balance of nutrients and energy expenditure.
Neurodegenerative Diseases: The Mediterranean diet has been associated with a reduced risk of neurodegenerative diseases. Studies suggest that it may help fight the decline in memory and thinking skills with age. The diet's potential impact on cognitive decline and dementia risk has been a subject of interest in Alzheimer's research.
Cancer Incidence: The Mediterranean diet may play a role in modifying hormones and growth factors involved in the pathogenesis of cancer. The high intake of dietary antioxidants, such as beta-carotene and vitamin E, may offer protective effects against coronary heart disease and other chronic conditions, including cancer.
It is important to note that while the Mediterranean diet has been extensively studied, there is ongoing research to further understand its effects and to standardize research methodologies. The variability in dietary patterns across different Mediterranean regions also complicates the assessment of potential health benefits. Nonetheless, the Mediterranean diet has gained recognition as a healthy dietary pattern and was included in the 2015–2020 Dietary Guidelines for Americans.
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Popularity and misconceptions
The Mediterranean diet has become incredibly popular, with everyone talking about it. However, few people follow it correctly, which has led to a lot of misconceptions and confusion. The Mediterranean diet is a way of eating inspired by the traditional dietary habits of the people of Crete, Greece, and southern Italy in the early 1960s. It was first proposed in 1975 by American biologist Ancel Keys and chemist Margaret Keys.
The Mediterranean diet has gained widespread popularity due to its perceived health benefits and association with reduced mortality and risk of chronic diseases. It is one of the three healthy diets recommended in the 2015–2020 Dietary Guidelines for Americans and was recognized as an Intangible Cultural Heritage of Humanity by UNESCO in 2010. The success of the Mediterranean diet lies in its composition, which includes a high consumption of vegetables, fruits, grains, legumes, fish, eggs, and a moderate intake of meat, oil, and wine. This varied and traditional diet, coupled with an active lifestyle, is often touted as the ideal model for healthy living.
However, there are several misconceptions about the Mediterranean diet that need clarification. Firstly, it is primarily a plant-based diet, but it does allow for low consumption of meat and meat products, fermented dairy, and moderate fish intake. The misconception that it is exclusively plant-based or vegetarian is incorrect. Secondly, the main concern regarding alcoholic beverages is not just the amount but the pattern of consumption, which may differ in different populations. Thirdly, a "low-fat" Mediterranean diet is not traditional, as the usual amount of fat in the diet is 30–45%, with olive oil as the principal source of fat.
Additionally, there are issues with the definition of the Mediterranean diet, even among researchers. Some reviews define it misleadingly as any diet that meets at least two of the nine traditional characteristics, such as high olive oil consumption, legumes, cereals, fruits, and vegetables. This lack of specificity may prove useless in practice. Other definitions based on macronutrient intake suggest that the diet is defined solely by unrestricted fat content, which is not accurate. Finally, some foods are misclassified as part of the Mediterranean diet, such as avocado, quinoa, margarine, tofu, and soy products, as they are not traditional Mediterranean foods.
It is important to consult with a healthcare provider or dietitian before adopting the Mediterranean diet or making any drastic dietary changes. They can provide tailored advice, modify the diet to suit individual needs, and ensure it is appropriate for one's health and goals.
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Comparison to other diets
The Mediterranean diet was first proposed in 1975 by American biologist Ancel Keys and chemist Margaret Keys. It was inspired by the eating habits and traditional food of Crete, Greece, and southern Italy in the early 1960s. The diet emphasizes plant-based foods, moderate consumption of fish and dairy, and low amounts of red meat. Olive oil is the principal source of fat.
The Mediterranean diet is one of the three healthy diets recommended in the 2015–2020 Dietary Guidelines for Americans, along with the DASH (Dietary Approaches to Stop Hypertension) diet and a vegetarian diet. The DASH diet is similar to the Mediterranean diet but allows more dairy and meat, while the Mediterranean diet includes more olive oil.
The Mediterranean diet has been compared to other popular diets such as paleo, ketogenic (or keto), Atkins, interval, zone, and Whole30. However, unlike these diets, the Mediterranean diet does not have strict rules about what is allowed and not allowed. Instead, it encourages eating more of certain foods (such as vegetables, fruits, whole grains, legumes, and lean proteins) and limiting others (such as added sugars, drinks with added sugar, refined carbohydrates, highly processed foods, and fatty or processed meats).
The Mediterranean diet has also been compared to the "Healthy U.S.-Style Eating Pattern" devised by the US 2015–2020 national guidelines. The Mediterranean diet includes more fruits and seafood and less dairy.
In terms of health benefits, the Mediterranean diet has been associated with a reduction in all-cause mortality and a lower risk of cardiovascular disease, cancer, neurodegenerative diseases, diabetes, and early death. A 2016 review found similar weight loss results to other diets. However, there is still uncertainty regarding the effects of the Mediterranean diet on cardiovascular disease occurrence, with some reviews calling for further standardized research.
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Frequently asked questions
Interest in the Mediterranean diet started in 1975 when American biologist Ancel Keys and chemist Margaret Keys first proposed the diet.
The Mediterranean diet was inspired by the eating habits and traditional food of Crete, Greece, and southern Italy as observed in the early 1960s.
The Mediterranean diet emphasizes plant-based foods, healthy fats, legumes, vegetables, fruits, whole grains, and the regular consumption of olive oil. It also includes moderate consumption of fish, seafood, dairy, and alcohol, with limited intake of red meat.
The Mediterranean diet is associated with a range of health benefits, including reduced risk of cardiovascular disease, cancer, neurodegenerative diseases, diabetes, and early death. It may also contribute to weight loss and improved overall health.
