The PREDIMED trial, the largest randomised controlled trial of dietary intervention and cardiovascular outcomes ever conducted, compared a Mediterranean whole food plant-predominant diet with a low-fat control diet in adults with high cardiovascular risk. After 5 years, the Mediterranean group had a 30 percent reduction in major cardiovascular events including heart attack and stroke. This was achieved through dietary change alone, without pharmaceutical intervention, in a population already at high risk.
How Plant-Based Diets Protect the Cardiovascular System
- LDL cholesterol reduction: soluble fibre from oats, legumes, and flaxseed reduces LDL cholesterol through bile acid sequestration; plant sterols in nuts and whole grains compete with cholesterol absorption
- Blood pressure reduction: potassium from fruits and vegetables reduces blood pressure through sodium excretion; dietary nitrates from dark leafy greens produce nitric oxide that dilates blood vessels
- Endothelial function: polyphenols from berries, dark chocolate, and extra-virgin olive oil directly improve endothelial function and reduce arterial stiffness
- LDL oxidation reduction: antioxidant polyphenols reduce the oxidation of LDL particles that initiates atherosclerotic plaque formation
- Platelet aggregation: plant omega-3 fatty acids and the prostaglandins derived from EPA reduce platelet stickiness and thrombotic risk
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