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Home » Uncategorized » Diet Review: Mediterranean Diet The Nutrition Source – Harvard University

Finding yourself confused by the seemingly endless promotion of weight-loss strategies and diet plans? In this series, we take a look at some popular dietsand review the research behind them.

Chances are you have heard of the Mediterranean diet. If you have a chronic condition like heart disease or high blood pressure, your doctor may even have prescribed it to you. It is often promoted to decrease the risk of heart disease, depression, and dementia.

The traditional diets of countries bordering the Mediterranean Sea differ slightly so there are different versions of the Mediterranean diet. However, in 1993 the Harvard School of Public Health, Oldways Preservation and Exchange Trust, and the European Office of the World Health Organization introduced the Mediterranean Diet Pyramid as a guide to help familiarize people with the most common foods of the region. More of an eating pattern than a strictly regimented diet plan, the pyramid emphasized certain foods based on the dietary traditions of Crete, Greece, and southern Italy during the mid-20th century. [1,2] At that time, these countries displayed low rates of chronic disease and higher than average adult life expectancy despite having limited access to healthcare. It was believed that the dietmainly fruits and vegetables, beans, nuts, whole grains, sh, olive oil, small amounts of dairy, and red winecontributed to their health benefits. The pyramid also highlighted daily exercise and the beneficial social aspects of eating meals together.

The Mediterranean diet is a primarily plant-based eating plan that includes daily intake of whole grains, olive oil, fruits, vegetables, beans and other legumes, nuts, herbs, and spices. Other foods like animal proteins are eaten in smaller quantities, with the preferred animal protein being fish and seafood. Although the pyramid shape suggests the proportion of foods to eat (e.g., eat more fruits and vegetables and less dairy foods), it does not specify portion sizes or specific amounts. It is up to the individual to decide exactly how much food to eat at each meal, as this will vary by physical activity and body size. There are additional points that make this eating plan unique:

This sample meal plan is roughly 2000 calories, the recommended intake for an average person. If you have higher calorie needs, you may add an additional snack or two; if you have lower calorie needs, you may remove a snack. If you have more specific nutritional needs or would like assistance in creating additional meal plans, consult with a registered dietitian.

Breakfast: 1 cup cooked steel-cut oats mixed with 2 tablespoons chopped walnuts, cup fresh or frozen blueberries, sprinkle of cinnamon

Snack: cup nuts, any type

Lunch:

Snack: 1 medium orange

Dinner:

Snack: 1 ounce 75% dark chocolate

Research has consistently shown that the Mediterranean diet is effective in reducing the risk of cardiovascular diseases and overall mortality. [3, 4] A study of nearly 26,000 women found that those who followed this type of diet had 25% less risk of developing cardiovascular disease over the course of 12 years. [5]The study examined a range of underlying mechanisms that might account for this reduction, and found that changes in inflammation, blood sugar, and body mass index were the biggest drivers. Similar benefits were found in a meta-analysis of 16 prospective cohort studies following more than 22,000 women for a median of 12.5 years. [6] Those who had the highest adherence to a Mediterranean diet showed a 24% lower risk of cardiovascular disease and 23% lower risk of premature death compared with those who had the lowest adherence.

One interesting finding of this eating plan is that it dispels the myth that people with or at risk for heart disease must eat a low fat diet. Although it does matter which types of fats are chosen, the percentage of calories from fat is less of an issue. The PREDIMED study, a primary prevention trial including thousands of people with diabetes or other risk factors for heart disease found that a Mediterranean diet supplemented with extra virgin olive oil or nuts and without any fat and calorie restrictions reduced the rates of death from stroke by roughly 30%. [7] Most dietary fats were healthy fats, such as those from fatty fish, olive oil, and nuts, but total fat intake was generous at 39-42% of total daily calories, much higher than the 20-35% fat guideline as stated by the Institute of Medicine. [8] Risk of type 2 diabetes was also reduced in the PREDIMED trial. [9]

There has also been increased interest in the diets effects on aging and cognitive function. [10-12] Cell damage through stress and inflammation that can lead to age-related diseases has been linked to a specific part of DNA called telomeres. These structures naturally shorten with age, and their length size can predict life expectancy and the risk of developing age-related diseases. Telomeres with long lengths are considered protective against chronic diseases and earlier death, whereas short lengths increase risk. Antioxidants can help combat cell stress and preserve telomere length, such as by eating foods that contain antioxidants nutrients like fruits, vegetables, nuts, and whole grains. These foods are found in healthy eating patterns like the Mediterranean diet. [13] This was demonstrated in a large cohort of 4676 healthy middle-aged women from the Nurses Health Study where participants who more closely followed the Mediterranean diet were found to have longer telomere length. [13]

Another Nurses Health Study following 10,670 women ages 57-61 observed the effect of dietary patterns on aging. [14] Healthy aging was defined as living to 70 years or more, and having no chronic diseases (e.g., type 2 diabetes, kidney disease, lung disease, Parkinsons disease, cancer) or major declines in mental health, cognition, and physical function. The study found that the women who followed a Mediterranean-type eating pattern were 46% more likely to age healthfully. Increased intake of plant foods, whole grains, and fish; moderate alcohol intake; and low intake of red and processed meats were believed to contribute to this finding.

Research supports the use of the Mediterranean diet as a healthy eating pattern for the prevention of cardiovascular diseases, increasing lifespan, and healthy aging. When used in conjunction with caloric restriction, the diet may also support healthy weight loss.

Last reviewed April 2023

The contents of this website are for educational purposes and are not intended to offer personal medical advice. You should seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website. The Nutrition Source does not recommend or endorse any products.

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Diet Review: Mediterranean Diet The Nutrition Source - Harvard University

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Home » Uncategorized » Diet Review: Mediterranean Diet The Nutrition Source – Harvard University