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This week on the Olive Health Information System website
The newsletter of the University of Navarra and the IOC dedicated to health
Article 1
The Mediterranean diet is consistently associated with healthier ageing, but understanding the mechanisms underlying its benefits is essential to fully appreciate its potential. Two recent studies explore complementary aspects of this question: whether adherence to the Mediterranean diet is associated with a lower risk of sarcopenia, a condition characterised by the progressive loss of muscle strength and mass, often accompanied by impaired physical performance, and whether its well-known anti-inflammatory effects are attributable to dietary quality itself or to the weight loss that may accompany dietary interventions. Together, these findings help clarify what we can realistically expect from a dietary pattern centred on olive oil.
A recent systematic review and dose–response meta-analysis pooled data from seven observational studies (three cohort studies and four cross-sectional studies), including 9,709 adults and 1,341 cases of sarcopenia. Participants with the highest adherence to the Mediterranean diet had a 19% lower risk of sarcopenia than those with the lowest adherence, while each additional point in the Mediterranean diet score was associated with a 13% lower risk. No evidence of publication bias was detected. The authors propose several potential explanations, including the diet’s low inflammatory potential, its richness in antioxidants and fibre from vegetables, fruits and extra virgin olive oil, and its low content of ultra-processed foods. However, given the observational nature of the evidence and the substantial heterogeneity between studies, further prospective studies and randomised controlled trials are needed to confirm these findings.
As inflammation is often proposed as a key mechanism linking the Mediterranean diet to better health outcomes, a randomised controlled-feeding trial sought to investigate this relationship directly. Fifty-three adults with metabolic risk factors (mean age 55 years) were assigned either to a fully provided Mediterranean diet, rich in extra virgin olive oil, vegetables, legumes and whole grains, or to continue their usual Western diet for eight weeks. Energy intake was adjusted to maintain stable body weight. During this phase, the Mediterranean diet reduced triglyceride levels by 22% and total and LDL cholesterol levels by 6% and 7%, respectively, but did not significantly change high-sensitivity C-reactive protein, the primary marker of low-grade inflammation. Only after two fasting days per week were introduced for a further eight weeks, accompanied by greater weight loss in the Mediterranean diet group, did C-reactive protein levels decrease compared with controls. This was accompanied by lower blood pressure, improved insulin sensitivity and reduced inflammatory signalling in the intestinal mucosa.
Taken together, these studies offer a more nuanced picture. A Mediterranean diet rich in olive oil may lead to improvements in blood lipid profiles, while long-term adherence is associated with a lower risk of sarcopenia. However, its potential anti-inflammatory effects may depend not only on dietary quality but also on energy balance and body weight. Since the trial was conducted in middle-aged adults, and weight loss in older people needs to be carefully managed to preserve muscle mass, future trials should investigate whether combining a Mediterranean diet with muscle-preserving strategies can deliver both benefits in older populations.
Article 2
The Mediterranean diet continues to inspire healthy eating strategies worldwide, but translating its benefits into different cultural contexts requires more than simply replicating traditional food choices. Two recent studies explore complementary aspects of this global challenge: adapting Mediterranean dietary principles to Asian food cultures and developing innovative technologies to safeguard olive oil authenticity. Together, they highlight how culturally appropriate dietary recommendations and reliable food quality assessment can contribute to the wider adoption of healthy eating patterns.
A recent perspective article proposes the Asian–Mediterranean dietary pattern (AMED), a framework that combines the evidence-based principles of the Mediterranean diet with healthy, locally available Asian foods and traditional culinary practices. The proposed pattern emphasises vegetables, whole grains, legumes, soy products, seafood, nuts, and unsaturated plant oils, including extra virgin olive oil, while encouraging traditional cooking methods such as steaming and stewing. It also addresses dietary challenges such as excessive sodium intake and the consumption of refined carbohydrates. A 20-week randomised controlled trial in Singapore is underway to assess the feasibility, acceptability, adherence, and potential health effects of this culturally adapted approach. Although further evidence is needed to establish its benefits, AMED offers a promising strategy for promoting healthy ageing and preventing non-communicable diseases while respecting regional food traditions.
Ensuring the authenticity of olive oil is another important consideration as this product reaches increasingly diverse markets. A study investigated terahertz time-domain spectroscopy (THz-TDS), combined with chemometric techniques, as a rapid, non-destructive approach to detecting adulteration in extra virgin olive oil. The researchers analysed samples adulterated with expired olive oil or refined olive oil at concentrations ranging from 5% to 50%. The classification model correctly identified 100% of the authentic samples, while quantitative prediction models achieved coefficients of determination above 0.95 and showed promising performance when tested on independent samples. These findings suggest that THz-TDS could become a valuable complementary tool for detecting olive oil adulteration, supporting quality control and helping protect the authenticity of a product valued for both its culinary qualities and its contribution to healthy dietary patterns.
As Mediterranean dietary principles are adapted to different regions of the world, preserving consumer trust in the foods associated with these patterns becomes increasingly important. The Asian–Mediterranean dietary framework illustrates how healthy eating recommendations can respect local traditions while incorporating beneficial elements from other food cultures, whereas emerging analytical technologies offer new opportunities to strengthen olive oil quality assurance. Although the proposed Asian–Mediterranean pattern also accommodates healthy oils other than olive oil, maintaining the authenticity of extra virgin olive oil remains relevant to its role within Mediterranean-style diets. Combining culturally sensitive nutrition strategies with reliable food authentication may help support the global adoption of healthy dietary patterns while safeguarding the quality and reputation of olive oil.
Other articles mentioned this week in the OHIS newsletter:
OLIVE FRUIT AND OLIVE OIL
Effects of non-thermal techniques on polyphenols in table olives (cv. Nocellara del Belice).
CARDIOMETABOLIC HEALTH
Workplace Health promotion and Mediterranean diet: a case series.
INFLAMMATORY AND IMMUNE DISEASES
Mediterranean diet and remission in rheumatoid arthritis: findings from the EIRA study.
AGEING AND MUSCLE HEALTH
MENTAL AND COGNITIVE HEALTH
The MIND Diet and Cognitive Health: Evidence and Limitations for the Dietary Prevention of Dementia.
WOMEN’S HEALTH
Trends, collaboration, and impact of scientific research on the Mediterranean diet during pregnancy.
OTHER CONDITIONS OR DISEASES
DIETARY PATTERNS
Toward an Optimal Diet for Health in Asia: The Asian-Mediterranean Dietary Pattern.
