The PREDIMED trial, a randomised controlled trial of nearly 7,500 participants at high cardiovascular risk, found that a Mediterranean diet supplemented with extra-virgin olive oil reduced major cardiovascular events by 30 percent compared to a low-fat diet. The trial was stopped early because the benefit was so clear. This is not an observational study vulnerable to confounding. It is a large, well-conducted randomised trial with a hard clinical endpoint.

What the Mediterranean Diet Actually Contains

The Mediterranean diet is a dietary pattern characterised by high consumption of vegetables, legumes, whole grains, fruits, nuts, and olive oil. It includes moderate consumption of fish, poultry, and dairy, and limited consumption of red meat, refined carbohydrates, and sweets. It is not a low-fat diet. Fat from olive oil typically provides 35 to 40 percent of total calories. The quality and source of macronutrients is what distinguishes it from typical Western eating patterns.

What It Protects Against

  • Cardiovascular disease: 30 percent risk reduction in PREDIMED; consistent findings across multiple large trials
  • Type 2 diabetes: consistent protection in prospective cohort studies across European and American populations
  • Cognitive decline: the MIND diet, a Mediterranean-DASH hybrid, reduces Alzheimer's risk by up to 53 percent in strict adherents
  • Depression: a 2017 randomised trial published in BMC Medicine found Mediterranean diet significantly reduced depression symptoms versus control
  • All-cause mortality: meta-analyses consistently show 10 to 20 percent lower all-cause mortality in highest versus lowest adherence groups

Practical Application for Adults Over 40

The Mediterranean diet does not require expensive foods, unusual ingredients, or complex preparation. It requires prioritising olive oil over refined vegetable oils, vegetables at every meal, legumes several times per week, fish twice per week, and limiting processed foods, refined grains, and added sugars. The pattern rather than any individual food drives the outcome.

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Isabella Hawke

Longevity Practitioner, Zhen Wellness — Onchan, Isle of Man

Isabella works with adults who want to address the physiological causes of decline rather than manage its symptoms. Her clinical background spans body composition, chronic pain, metabolic health, and functional ageing.

About Isabella

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