Atherosclerotic cardiovascular disease (ASCVD), encompassing conditions such as coronary artery disease, stroke, and peripheral artery disease, remains a leading cause of morbidity and mortality worldwide. Atherosclerosis involves the progressive buildup of lipid-rich plaques within arterial walls, driven by inflammation, oxidative stress, and endothelial dysfunction. Dietary modifications play a pivotal role in both primary and secondary prevention of ASCVD. This article outlines evidence-based nutritional strategies supported by leading health organizations and peer-reviewed research to reduce the risk and progression of ASCVD.
1. Adopt a Mediterranean or DASH Diet Pattern
Numerous clinical trials and meta-analyses support dietary patterns rather than isolated nutrients. Two of the most validated diets are:
Mediterranean Diet
Key features: High intake of fruits, vegetables, whole grains, legumes, nuts, olive oil; moderate intake of fish and poultry; low intake of red meat and sweets.
Evidence: The PREDIMED trial demonstrated a 30% relative reduction in major cardiovascular events among high-risk individuals following a Mediterranean diet enriched with extra-virgin olive oil or nuts.
DASH Diet (Dietary Approaches to Stop Hypertension)
Key features: Emphasizes vegetables, fruits, low-fat dairy, whole grains, poultry, fish, and nuts; low in saturated fat, red meat, and added sugars.
Evidence: Initially designed to lower blood pressure, the DASH diet has also been linked to reduced incidence of heart failure and coronary heart disease.
2. Increase Intake of Dietary Fiber
Sources: Whole grains (e.g., oats, barley), legumes, fruits, vegetables, and flaxseed.
Mechanism: Soluble fiber lowers LDL cholesterol by binding bile acids in the gut, promoting their excretion.
Evidence: A meta-analysis in The American Journal of Clinical Nutrition (2015) found that every 7g/day increase in fiber intake was associated with a 9% reduction in coronary heart disease risk.
3. Limit Saturated and Trans Fats; Replace with Unsaturated Fats
Saturated fats: Found in red meat, full-fat dairy, butter, and coconut oil.
Trans fats: Found in partially hydrogenated oils, processed baked goods, and fried foods.
Unsaturated fats: Monounsaturated (olive oil, avocados) and polyunsaturated (fatty fish, walnuts, sunflower oil).
Evidence: Replacing saturated fats with polyunsaturated fats reduces LDL cholesterol and ASCVD risk. The PURE study and multiple meta-analyses confirm the cardiovascular benefits of reducing saturated fat when replaced by unsaturated fats, particularly PUFAs.
4. Include Omega-3 Fatty Acids
Sources: Fatty fish (salmon, sardines, mackerel), flaxseeds, walnuts, and chia seeds.
Mechanism: Anti-inflammatory, anti-thrombotic, and triglyceride-lowering effects.
Evidence: The REDUCE-IT trial showed a significant reduction in major adverse cardiovascular events with icosapent ethyl (EPA derivative) in high-risk patients with elevated triglycerides.
5. Reduce Added Sugars and Refined Carbohydrates
Sources to limit: Sugar-sweetened beverages, pastries, white bread, and candy.
Mechanism: Excess sugar contributes to hyperglycemia, insulin resistance, and dyslipidemia.
Evidence: Diets high in added sugars are associated with a greater risk of ASCVD mortality, independent of other dietary and lifestyle factors.
6. Limit Dietary Sodium
Target intake: <2,300 mg/day; ideally <1,500 mg/day for hypertensive individuals.
Sources: Processed foods, restaurant meals, canned soups, cured meats.
Evidence: Excess sodium is strongly linked to hypertension, a major ASCVD risk factor. The INTERSALT and TOHP studies demonstrated direct associations between sodium intake and cardiovascular events.
7. Moderate Alcohol Consumption
Guidelines: If consumed, limit to ≤1 drink/day for women and ≤2 drinks/day for men.
Evidence: While moderate red wine intake has been historically linked to heart health, newer research suggests that even light drinking may have adverse effects. The Global Burden of Disease Study (2019) emphasizes that no level of alcohol consumption improves overall health.
8. Incorporate Plant-Based Proteins
Examples: Legumes, tofu, tempeh, nuts, seeds, and whole grains.
Mechanism: Plant proteins are lower in saturated fat and cholesterol and contain beneficial phytochemicals.
Evidence: Replacing animal protein, particularly red and processed meats, with plant-based protein is associated with lower ASCVD and all-cause mortality risk.
9. Use of Functional Foods and Supplements
Plant Sterols and Stanols
Found in fortified foods like margarine and yogurt.
Shown to reduce LDL cholesterol by 5–15% when consumed at 2g/day.
Coenzyme Q10, Garlic, and Soluble Fiber Supplements
Some studies suggest modest benefits for lipid and blood pressure management, but more evidence is needed before widespread recommendations.
Conclusion
Atherosclerotic cardiovascular disease is significantly influenced by dietary habits. The adoption of a heart-healthy diet—rich in whole foods, plant-based ingredients, and healthy fats—coupled with the reduction of processed foods, added sugars, and unhealthy fats, provides a powerful tool for both prevention and management. Nutrition interventions, when integrated with lifestyle changes such as regular physical activity, smoking cessation, and adequate sleep, offer a comprehensive and effective approach to reducing ASCVD burden.
