Home > Diet and nutrition > News 07 January 2014 Mediterranean diet may protect against diabetes A Mediterranean diet rich in olive oil may protect those with a high risk for heart disease against diabetes - without cutting back on calories. 0 Food of the Mediterranean diet ~ Related Eat Mediterranean, live longer Diet 2013: the good, the bad and the ugly Low 'brown fat' levels tied to higher diabetes risk Vit & Min doses per day » Count calories in food » Is my vegetarian diet balanced? » Ask The Dietitians » 10 foods to boost your immune system Your quick guide to Banting Without cutting back on calories, adopting a Mediterranean diet rich in extra-virgin olive oil may protect people at high risk for heart disease against diabetes, a new study found.Researchers who analysed data on more than 3 500 people at an increased risk for heart disease found those who were put on a Mediterranean diet were about 30 percent less likely to develop diabetes over the next four years, compared to those assigned to a general low-fat diet."Randomised trials have shown that lifestyle interventions promoting weight loss can reduce the incidence of type 2 diabetes, however, whether dietary changes without calorie restriction or increased physical activity also protect from diabetes development has not been evaluated in the past," Dr. Jordi Salas-Salvado wrote to Reuters Health.Salas-Salvado is the study's lead author and a professor of nutrition at Rovira i Virgili University and the head of the Department of Nutrition at the Hospital de Sant Joan de Reus in Spain.Previous research suggested Mediterranean diets that are generally hign in vegetables, fibre-rich grains, legumes, fish and plant-based sources of unsaturated fat such as olive oil and nut may be protective against diabetes.They are low in red meat and high-fat dairy, prime sources of saturated fat. In addition to being touted as beneficial to people with heart disease, Mediterranean diets are believed to have components that reduce inflammation throughout the body and may have some impact on diabetes.Read: The link between inflammation, obesity and diseaseType 2 diabetes, sometimes referred to as adult-onset diabetes, is when the body's cells are resistant to insulin or the body doesn't make enough of the hormone, so glucose remains in the bloodstream and can climb to dangerously high levels.Insulin gives glucose - or blood sugar - access to the body's cells to be used as fuel. For the new study, published in the Annals of Internal Medicine, the researchers used data from an existing trial that compared the effectiveness of Mediterranean-style diets to a low-fat diet. Between 2003 and 2009, 3 541 Spaniards ages 55 to 80 were enrolled in the trial. None of the participants had diabetes at the start of the trial, but all had three or more risk factors for heart disease. Those include smoking, being overweight and having high cholesterol.Trying three different diets1. One diet consisted of a Mediterranean diet that derived most of its unsaturated fat from extra-virgin olive oil. 2. Another group was assigned a Mediterranean diet that used mixed nuts as its main source of unsaturated fat. 3. The third diet emphasised reducing all fat consumption.None of the diets, however, asked the participants to cut down on how many calories they ate or to increase how much they exercised.After about four years, 273 of the participants had developed diabetes. That included 6.9 percent of participants from the extra-virgin olive oil group, 7.4 percent from the mixed nuts group and 8.8 percent from the reduced-fat group.Read: A new study shows a diet high in fat can actually help diabeticsThe researchers caution that the difference in diabetes cases among people on the mixed nuts and reduced-fat diets may have been due to chance. They can't explain why the mixed nuts diet didn't show quite the same benefit as the extra-virgin olive oil diet.But Salas-Salvado said the difference between the two Mediterranean diets could also be a coincidence, because both have additional unsaturated fatty acids that are linked to a reduced diabetes risk.He said cutting calories along with adopting a Mediterranean-style diet would likely reduce risks even further."These benefits have been observed in participants between 55 to 80 years old at high cardiovascular risk," he said. "Therefore, the message is that it is never too late to switch to a healthy diet like the Mediterranean."Read moreYour guide to eating the Mediterranean wayProfessor Tim Noakes defends his high-fat, low carb theoryLimiting your carbohydrate intake, and not your calories, will help reduce liver fat faster More in Diet and nutrition Mediterranean diet may help prevent macular degeneration More: Diet and nutritionNews advertisement Read Health24’s Comments Policy Comment on this story 0 comments Comments have been closed for this article. Logout Comment 0 characters remaining Share on Facebook Loading comments... Other news Parenting Infants should share parents' room to help prevent SIDS Lifestyle Blood for transfusion doesn't have to be fresh Medical Calcium supplements safe for heart Medical QUIZ: Can you live with only one lung? 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