Fats, cholesterol, and diet for cardiovascular health

The debate about what to eat to protect the heart has been generating confusion for decades. Seeds are out, saturated fat is back, carbohydrates are the enemy. And with each new cycle of headlines, it becomes harder to know what to do at the grocery store on a Tuesday afternoon. This article synthesizes what the strongest scientific evidence says about cardiovascular nutrition: which fats to eat, how to lower ApoB, which dietary patterns actually work, and how to control blood pressure through food.

ApoB as the key marker of cardiovascular risk

Before discussing specific foods, it is important to understand the marker that best predicts cardiovascular disease risk: ApoB. Apolipoprotein B is the protein that coats atherogenic lipoproteins circulating in the blood, and when present in excess, these particles deposit in the arterial wall and contribute to plaque formation.

Unlike standard LDL cholesterol, ApoB counts the number of atherogenic particles regardless of their size, making it a more precise predictor of risk. Yet many cardiologists still do not order it routinely. If you do not have this data, non-HDL cholesterol can serve as an alternative marker while you include ApoB in your next lab work.

Lowering ApoB requires acting on two fronts: limiting hepatic production of atherogenic lipoproteins (primarily by modulating saturated fat) and improving the clearance of ApoB from circulation (primarily through fiber and plant sterols).

Fat quality, not quantity

For decades, the public health message was to reduce fat overall. The result was that many people replaced fat with refined carbohydrates, which did not improve cardiovascular health and worsened rates of diabetes and obesity.

What the evidence shows is that the type of fat matters far more than the total amount:

• Saturated fats in excess reduce LDL receptor activity in the liver, meaning the liver cannot recycle LDL efficiently and produces more ApoB.
• Mono and polyunsaturated fats (olive oil, nuts, avocado, fatty fish) support LDL receptor activity and improve HDL functionality for recycling LDL from the blood back to the liver.
• Seed oils (sunflower, canola, soybean) are not pro-inflammatory. A large body of evidence, including approximately 20 randomized trials, shows no increase in inflammatory markers with regular consumption. The myth that omega-6 fats are inflammatory is not supported by the data.

The practical recommendation is to keep saturated fat below 6 percent of daily caloric intake and replace it with unsaturated fats, not refined carbohydrates.

The portfolio diet for lowering ApoB without medication

The portfolio diet is a dietary pattern designed to reduce ApoB and LDL cholesterol through four nutritional interventions that, combined, produce approximately a 30 percent reduction in LDL, comparable to a low-intensity statin:

1. Nuts and seeds: 45 g per day. Provide fiber and unsaturated fats that upregulate hepatic LDL receptors.
2. Plant protein: 50 g per day (soy foods, lentils, chickpeas, peas). Naturally reduces saturated fat intake, increases fiber, and adds phytosterols.
3. Viscous fiber: fruits, vegetables, whole grains, and legumes. This fiber binds bile acids in the gut and facilitates their excretion, forcing the liver to produce more bile and pull more LDL from circulation.
4. Phytosterols or phytostanols: 2 g per day. They block intestinal cholesterol absorption. Phytostanols (such as those used in the Benecol brand) are preferable because, unlike phytosterols, they are barely absorbed into circulation.

Can diet reverse atherosclerosis?

Yes, with nuance. Clinical trials show that diet can trigger regression of non-calcified plaque and, in some cases, reduce intima-media thickness in the carotid arteries. Studies combining lipid-lowering medication with dietary changes achieve significantly greater results than medication alone.

The Mediterranean diet, supported by trials such as PREDIMED and CORDIOPREV, has the most accumulated evidence for reducing cardiovascular events, improving plaque composition, and promoting its stabilization. The goal is not to eliminate fat but to prioritize extra virgin olive oil, nuts, fatty fish, legumes, and whole grains.

Sodium, potassium, and blood pressure

Elevated blood pressure is rarely caused by excess salt alone. The imbalance between sodium and potassium is an equally important factor. Sodium retains fluid and constricts blood vessels; potassium does the opposite: it signals the kidneys to excrete sodium and relaxes the vascular endothelium.

The recommended potassium intake is around 4,700 mg per day, but most people fall short of that threshold even when they believe they follow a healthy diet. The best sources are beans and legumes, salmon, leafy green vegetables, sweet potato, broccoli, and fruits. Reducing sodium and increasing potassium simultaneously is the lever with the greatest impact on blood pressure, more so than acting on either one alone.

Most sodium in the Western diet does not come from the salt shaker but from ultra-processed foods: deli meats, bread, tomato sauces, pizzas, and processed dairy products. Reading labels and prioritizing whole foods is the most effective strategy for managing sodium intake without obsessing.

Conclusion

Protecting the heart through nutrition does not require eliminating food groups: it requires understanding which fats to eat, how to increase fiber and plant protein, and how to balance sodium and potassium. The Mediterranean diet provides a solid reference framework. Specific interventions such as the portfolio diet can be added when there are concrete targets such as reducing ApoB. Medication and lifestyle are not alternatives to each other: they multiply each other is effects when combined.