Definition/Introduction

Dietary therapy is a foundational nonpharmacologic strategy for lowering low-density lipoprotein cholesterol (LDL-C) and reducing the risk of atherosclerotic cardiovascular disease (ASCVD). Across the lifespan, diet influences lipid metabolism, systemic inflammation, insulin sensitivity, and vascular health, underscoring the importance of nutrition in cardiovascular risk management, regardless of whether pharmacologic therapy is ultimately required. Contemporary nutrition guidance has shifted away from an isolated focus on dietary cholesterol toward an emphasis on overall dietary patterns, fat quality, fiber intake, and food sources.

Accumulating evidence demonstrates that saturated fat intake, the macronutrients and foods that replace saturated fat, and the degree of food processing exert a greater influence on LDL-C levels and cardiovascular outcomes than dietary cholesterol alone. As a result, modern dietary recommendations prioritize replacing saturated fats from sources such as butter, full-fat dairy, fatty meats, and tropical oils with unsaturated fats from plant oils, nuts, seeds, and fish; eliminating industrially produced trans fats; and emphasizing fiber-rich, minimally processed foods, rather than targeting cholesterol intake as a primary goal. Dietary therapy is appropriate both as first-line management for individuals with mild to moderate LDL-C elevation and as an adjunct to lipid-lowering medications in higher-risk populations.

Professional guidance from major organizations, including the American College of Cardiology (ACC), the American Heart Association (AHA), and the Dietary Guidelines for Americans, consistently supports dietary patterns that reduce ASCVD risk. These include the Mediterranean diet, the Dietary Approaches to Stop Hypertension (DASH) diet, plant-based and vegetarian dietary patterns, and the dietary portfolio approach, all of which emphasize favorable fat quality, high fiber intake, and minimally processed foods. Core recommendations include limiting saturated fat intake, replacing saturated fats with monounsaturated and polyunsaturated fats, and increasing consumption of fiber-rich foods such as vegetables, fruits, legumes, whole grains, nuts, and seeds. 

The AHA recommends limiting saturated fat intake to less than 7% of total calories for the general population, and to less than 6% for individuals at higher cardiovascular risk.[1][2] The federal Dietary Guidelines for Americans (2025–2030) recommend that saturated fat intake not exceed 10% of total daily calories, equivalent to approximately 22 g/day in a 2000-calorie diet.[3][4] Collectively, these approaches lower LDL-C, improve cardiometabolic markers, and reduce cardiovascular risk at the population level.

This topic focuses exclusively on dietary strategies for LDL-C reduction. Pharmacologic approaches to hypercholesterolemia are addressed elsewhere in this series. Please see StatPearls companion topic, "Hypercholesterolemia," for further discussion on the pharmacologic management of hypercholesterolemia.

Issues of Concern

Implementing dietary therapy for LDL-C reduction is challenging, owing to confusion about recommended diets, difficulty with adherence, and modest reductions in LDL-C compared with medications.

Outdated Focus on Dietary Cholesterol

The 2006 AHA Diet and Lifestyle Recommendations limited dietary cholesterol to less than 300 mg/day.[5] A pivotal shift began with the 2015 to 2020 Dietary Guidelines for Americans, which removed the specific 300 mg/day cholesterol restriction. The AHA clarified this change in its 2020 Science Advisory on Dietary Cholesterol and Cardiovascular Risk, noting that although recent guidelines had moved away from explicit numerical cholesterol targets, individuals should not increase their dietary cholesterol intake.[6] This advisory acknowledged that dietary cholesterol raises LDL-C in a dose-dependent manner—meta-analyses show that each 100 mg/day increase in dietary cholesterol raises LDL-C by approximately 1.93 mg/dL.[7] However, the effect is modest compared with that of saturated fat, and isolating the independent impact of cholesterol is complicated by its co-occurrence with saturated fat in foods such as eggs, bacon, sausage, and processed foods.[6]

A persistent misconception is that lowering dietary cholesterol alone is sufficient to reduce serum LDL-C. Contemporary evidence indicates that although dietary cholesterol raises LDL-C levels in most individuals, endogenous cholesterol synthesis, regulated by hepatic metabolism and influenced by saturated fat intake, plays a substantially larger role in determining serum LDL-C levels. Controlled dietary intervention studies and meta-analyses consistently show that saturated fat intake and overall dietary pattern exert a far greater influence on LDL-C than dietary cholesterol. Consequently, foods traditionally characterized as high in cholesterol, such as eggs, may have variable effects on LDL-C that depend on the overall dietary pattern and the accompanying intake of saturated fats and refined carbohydrates. Continued emphasis on cholesterol restriction alone may divert attention from more impactful dietary targets, including fat quality, fiber intake, and whole-food rather than processed-food choices.[8]

Nutrient-Centric Versus Pattern-Based Counseling

Overemphasis on cholesterol or total fat can inadvertently lead patients to choose ultra-processed "cholesterol-free" or "low-fat" foods that are high in refined carbohydrates, added sugars, or saturated fats. Such substitutions may confer no cardiometabolic benefit and may increase risk. Pattern-based counseling emphasizes whole-food combinations that consistently improve lipid profiles and cardiovascular outcomes. Dietary patterns rich in vegetables, fruits, whole grains, legumes, nuts, seeds, and unsaturated fats lower LDL-C through multiple mechanisms, including reducing saturated fat intake and increasing soluble fiber, while also improving insulin sensitivity and overall cardiometabolic health.[9]

Inconsistent Interpretation of Popular Dietary Patterns

Considerable confusion exists regarding the cardiovascular effects of popular dietary patterns, including the Mediterranean, DASH, plant-based, and low-carbohydrate diets. Public messaging on eggs, dairy, red meat, and dietary fats is often inconsistent, making it difficult to discern which recommendations are evidence-based. While multiple dietary patterns are associated with reductions in LDL-C, the magnitude and reliability of these effects vary by diet composition and outcome measures. The Mediterranean, DASH, plant-based, and vegetarian diets reduce LDL-C primarily by lowering saturated fat intake and increasing fiber intake. However, adherence and sustainability vary.[10] Low-carbohydrate diets produce varied effects depending on whether people replace carbohydrates with higher amounts of saturated fat.

Notably, replacing saturated fat with average-quality carbohydrates lowers LDL-C by only 0.21 mmol/L while increasing triglycerides by 0.17 mmol/L, resulting in a neutral effect on cardiovascular disease rates.[11] In contrast, replacing carbohydrates with unsaturated fats or protein, as in the OMNIHeart trial, further reduces LDL-C and prevents elevations in triglycerides.[10][12] Clinicians should provide clear guidance by distinguishing evidence-based dietary patterns with demonstrated cardiovascular benefit from popular dietary trends unsupported by outcome data.[13]

Adherence and Sustainability

Long-term adherence remains a significant barrier to effective dietary therapy. Strict interventions, such as purely plant-based diets combined with aggressive lifestyle changes, can reduce LDL-C by up to 20%. Still, adherence over the medium to long term is generally poor, particularly in primary prevention populations, limiting their real-world effectiveness.[14] Less resource-intensive approaches can improve sustainability without sacrificing efficacy. For example, a portfolio dietary intervention requiring only 2 clinic visits achieved LDL-C reductions comparable to those achieved with more intensive counseling involving 7 visits, highlighting the feasibility of pragmatic strategies.[15] 

Other factors influencing adherence include restrictive or prescriptive messaging, cultural food preferences, food access, and socioeconomic constraints. Flexible dietary strategies that allow for personalization, cultural relevance, and gradual change are more likely to support long-term reductions in ASCVD risk. Recent guidance emphasizes aligning dietary therapy with patient goals and quality-of-life considerations to enhance sustained engagement.

Modest Effects Compared to Pharmacotherapy

When optimally implemented, dietary therapy typically lowers LDL-C by 8% to 15%, substantially less than with statins (20%–50% reduction) or Proprotein convertase subtilisin/kexin type 9 inhibitors (up to 60% reduction).[16] Clinicians must set realistic expectations for patients and consider dietary therapy as a complementary strategy to pharmacologic therapy when indicated.

Clinical Significance

Impact of Dietary Patterns on LDL Cholesterol and Cardiometabolic Risk

Dietary modification is a clinically meaningful intervention for lowering LDL-C, with potential reductions ranging from approximately 10% to 30%, depending on the dietary pattern, baseline LDL-C level, and degree of adherence. One of the most effective dietary substitutions is replacing 5% of total energy intake from saturated fat with polyunsaturated fat, which is associated with approximately 5% to 10% reductions in LDL-C. Comprehensive dietary intervention trials report mean reductions in LDL-C of 13% to 20%. Portfolio-style dietary patterns may produce even greater reductions under controlled conditions.[17][18] In addition to lipid-lowering, dietary therapy favorably influences overall diet quality and multiple cardiometabolic risk factors, including blood pressure, insulin sensitivity, and systemic inflammation. As such, dietary intervention remains a foundational component of cardiovascular risk reduction across diverse patient populations.[11]

Plant-Based Dietary Patterns and LDL-C Reduction

The 2025 American Association of Clinical Endocrinology consensus statement recommends dietary patterns such as the Mediterranean diet, DASH, and healthful plant-based diets to reduce ASCVD risk.[19] Similarly, the National Lipid Association endorses several evidence-based dietary patterns, including DASH, AHA, Mediterranean-style, and vegetarian or vegan diets, tailored to individual lipid abnormalities and cultural food preferences.[20] Most dietary patterns associated with LDL-C reduction are predominantly plant-based.

In the clinical literature, the term "plant-based" refers to dietary patterns that emphasize plant foods—vegetables, fruits, whole grains, legumes, nuts, and seeds—without necessarily excluding animal products. This category includes vegetarian and vegan diets, as well as cardiometabolic health–focused patterns such as the Mediterranean, DASH, and Nordic diets and the dietary portfolio approach. Unlike vegetarian or vegan diets, which exclude meat or all animal products, respectively, plant-based dietary patterns prioritize plant foods while allowing limited intake of animal products such as dairy, eggs, fish, and meat.[21][22] 

The Mediterranean diet

The Mediterranean diet is characterized by high intake of fruits, vegetables, whole grains, legumes, nuts, olive oil, and fish, with limited consumption of red and processed meats. This pattern consistently produces modest reductions in LDL-C and, more importantly, is associated with reductions in both primary and secondary cardiovascular events.[23][24] The favorable fat quality, high fiber intake, and a rich supply of bioactive compounds with anti-inflammatory and antioxidant properties are responsible for these benefits.[25]

The DASH diet

The DASH diet, well established for reducing blood pressure and improving overall cardiometabolic risk, emphasizes fruits, vegetables, whole grains, low-fat dairy products, lean protein sources, and sodium restriction. Some studies' results demonstrate modest reductions in LDL-C; however, a 2025 Cochrane review found inconsistent effects on LDL-C across trials, highlighting the need for longer-term, well-designed randomized controlled trials. Despite this limitation, the DASH diet remains particularly appropriate for patients with hypertension or metabolic syndrome in whom LDL-C management is also a priority.[26]

The dietary portfolio approach

The dietary portfolio approach is a structured, plant-based dietary pattern that combines 4 evidence-based cholesterol-lowering components: approximately 2 g/day of plant sterols (typically achieved through fortified foods), at least 10 g/day of viscous fiber (such as psyllium, oats, barley, and legumes), about 50 g/day of plant protein (with an emphasis on soy protein), and roughly 45 g/day of nuts. Consuming 2 grams of plant sterols daily from natural foods alone is challenging and impractical, as it would require eating large amounts of sterol-rich foods, thereby increasing caloric intake. Clinical trials involving this approach achieved this intake by incorporating plant sterol–enriched margarine, typically providing approximately 1 g of plant sterols per serving, allowing participants to reach 2 g/day without substantially increasing total caloric intake.[27] Controlled trials demonstrate LDL-C reductions ranging from 13% to 30%, in some cases approaching the magnitude of reductions achieved with first-generation statin therapy.[28]

The LDL-C–lowering effects of the dietary portfolio approach arise from complementary mechanisms. Plant sterols competitively inhibit intestinal cholesterol absorption, reducing uptake by approximately 10%. Viscous fibers bind bile acids, increasing fecal bile acid excretion and stimulating hepatic conversion of cholesterol into bile acids.[17][29] Plant proteins and nuts further contribute through favorable fatty acid profiles and bioactive compounds that improve lipid metabolism. Despite its efficacy, the dietary portfolio approach requires adherence to multiple prescriptive components, which may limit feasibility and long-term adherence in real-world settings.[16]

Other Plant-Based Dietary Patterns

Additional dietary patterns associated with LDL-C reduction include vegetarian, vegan, pescatarian, and Nordic diets. As with the other dietary patterns discussed throughout this topic, reduced saturated fat intake, increased consumption of soluble fiber, and greater reliance on minimally processed plant foods drive the LDL-C lowering in these patterns. Variability in adherence and nutritional adequacy underscores the importance of individualized dietary counseling.

Key Dietary Components that Lower LDL-C 

Across dietary patterns, the following mechanisms operate synergistically to improve LDL-C and overall ASCVD risk:

• Replacing saturated fats with monounsaturated and polyunsaturated fats
• Increasing soluble fiber intake from sources such as oats, legumes, and psyllium
• Incorporating nuts, seeds, and plant-based protein sources
• Limiting ultra-processed foods and refined carbohydrates, including white bread, white rice, pasta, pastries, sugary cereals, pizza, crackers, and high-sugar foods

Populations with Enhanced Benefit

Dietary therapy tends to produce greater absolute LDL-C reductions in individuals with higher baseline LDL-C levels and in patients with obesity, metabolic syndrome, or type 2 diabetes. In these populations, improvements in insulin sensitivity and weight regulation may further amplify lipid-lowering effects.[30][31]

Limits of Clinical Evidence

Although dietary patterns consistently improve lipid profiles and cardiometabolic risk factors, much of the evidence relies on surrogate endpoints rather than hard cardiovascular outcomes. For example, no randomized controlled trial has directly evaluated the impact of the dietary portfolio approach on cardiovascular events, despite its robust efficacy in lowering LDL-C.[16] Similarly, a recent Cochrane review of randomized controlled trials evaluating Mediterranean dietary interventions specifically for primary prevention found low-certainty evidence of modest improvements in ASCVD risk factors, with uncertainty about reductions in hard clinical events.[32] These limitations underscore the need to integrate dietary therapy into comprehensive ASCVD risk-reduction strategies while continuing to individualize care based on patient risk, preferences, and feasibility.

Clinical Integration 

Healthcare professionals should deliver dietary counseling in conjunction with other lifestyle interventions, including regular physical activity, weight management, and smoking cessation. The ACC and the AHA recommend that adults engage in at least 150 min/wk of moderate-intensity aerobic activity or 75 min/wk of vigorous-intensity aerobic activity (or an equivalent combination) for both primary prevention and management of established ASCVD.[33][34] Dietary patterns rich in fruits, vegetables, whole grains, legumes, nuts, seeds, and unsaturated plant oils are consistently associated with improvements in LDL-C and overall cardiometabolic risk, while processed meats and foods high in saturated or trans fats should be minimized.[35]

Nursing, Allied Health, and Interprofessional Team Interventions

Although general awareness of cholesterol-lowering diets is high, evolving evidence and increasingly complex dietary guidance require a more active, collaborative role for clinicians, nurses, dietitians, and pharmacists. Nutrition therapy is most effective when integrated into routine ASCVD risk assessment and reinforced longitudinally rather than delivered as a one-time intervention. Current guidelines emphasize replacing saturated and trans fats with mono- and polyunsaturated fats, prioritizing whole-food dietary patterns, and avoiding industrial trans fats. Translating these recommendations into sustainable, patient-centered strategies requires coordinated care across settings and integration with other lifestyle interventions, including physical activity, weight management, and smoking cessation.

Achieving meaningful LDL-C reduction through dietary therapy depends on coordinated skills, shared strategies, and effective interprofessional communication. Physicians and advanced practice clinicians identify appropriate candidates based on baseline LDL-C, cardiometabolic risk, and readiness for change, reinforce guideline-based nutrition alongside pharmacologic therapy, and monitor lipid responses to set realistic expectations for diet-related LDL-C reduction. Registered dietitians provide individualized, evidence-based nutrition counseling, translating guideline recommendations into practical, culturally appropriate meal plans that prioritize sustainability, flexibility, and quality of life over rigid restrictions, while addressing adherence challenges, nutrient adequacy, and dietary misinformation. 

Nurses reinforce dietary goals during chronic disease management and follow-up visits, identify barriers and misconceptions, and provide continuity between lifestyle modification and medication adherence. Pharmacists further support care coordination by reinforcing dietary strategies that complement lipid-lowering therapies and educating patients on food–medication considerations. Across disciplines, shared decision-making and clear communication are central to patient-centered care. Collaborative counseling helps patients understand that dietary interventions primarily affect surrogate lipid markers, supports realistic goal setting, and prioritizes sustainable, flexible eating patterns aligned with patient preferences, cultural values, and quality of life. Together, these team-based approaches improve adherence, enhance outcomes, reduce cardiovascular risk, and strengthen overall team performance in LDL-C dietary therapy.

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Disclosure: Sharon Daley declares no relevant financial relationships with ineligible companies.

Disclosure: Jennifer Goldin declares no relevant financial relationships with ineligible companies.