Do Organ Meats Raise Cholesterol? Looking at the Evidence

The fear of cholesterol is so entrenched that people avoid the most nutritious foods available. It's time to separate the actual science from the mythology.

The crucial distinction: dietary versus serum cholesterol

Here's the foundational confusion. Dietary cholesterol (the cholesterol you eat) is not the same as serum cholesterol (the cholesterol in your blood). They are related, but the relationship is far weaker than most people believe.

The body produces most of its own cholesterol — roughly 70–80% of circulating cholesterol comes from endogenous synthesis, mostly in the liver, and dietary cholesterol intake produces compensatory changes in synthesis in many people.¹

The cholesterol you eat accounts for only 20 to 30 per cent of your serum cholesterol. And even more surprising, when you eat more dietary cholesterol, your liver manufactures less. When you eat less dietary cholesterol, your liver manufactures more. Your body is trying to maintain a stable amount.

The 2015–2020 Dietary Guidelines for Americans Advisory Committee removed the previous 300 mg/day limit on dietary cholesterol, concluding that "cholesterol is not a nutrient of concern for overconsumption" given the limited correlation between dietary cholesterol intake and serum cholesterol in most people.²

Eating cholesterol does not automatically raise your blood cholesterol. Your liver adjusts production based on intake. This is basic homeostasis, not theory.

So if eating dietary cholesterol doesn't strongly correlate with serum cholesterol, why is the myth so persistent? Because the myth predates modern research. It comes from outdated studies that measured total cholesterol without distinguishing LDL from HDL, and that assumed all dietary fat raises serum cholesterol. Both assumptions are now known to be false.

Why eating cholesterol doesn't automatically raise blood cholesterol

The mechanism is called feedback inhibition. Your cells need cholesterol. When they get enough, they tell your liver to stop making it. When they don't get enough, they signal the liver to make more.

When you eat a liver and get 300 milligrams of dietary cholesterol, your cells are satisfied. Your liver responds by reducing cholesterol synthesis. The net effect on your blood cholesterol is minimal or negative (your total goes down slightly).

This is why people eating high-cholesterol foods (organ meats, eggs, shellfish) often show lower serum cholesterol than people eating low-cholesterol diets. It sounds counterintuitive, but it's basic biochemistry.

The link between saturated fat intake and cardiovascular disease has been re-examined. A 2010 meta-analysis by Siri-Tarino and colleagues of 21 prospective cohort studies (347,747 participants) found no significant evidence concluding that dietary saturated fat is associated with increased CHD or CVD risk; a 2014 meta-analysis by Chowdhury and colleagues reached similar conclusions.³⁴

Organ meats are high in cholesterol and moderate in saturated fat. If saturated fat is the factor driving your serum cholesterol up, then yes, eating large amounts of organ meats might do so. But the cholesterol in them is mostly irrelevant. The saturated fat content matters more, and even that varies by person.

LDL particle size: not all cholesterol is equal

Here's where the story gets complicated and most doctors still haven't caught up. Total LDL cholesterol is not the danger. LDL particle size is.

There are two types of LDL particles. Large, buoyant particles and small, dense particles. Large particles don't easily lodge in artery walls. They're protective. Small, dense particles do lodge easily and cause inflammation and atherosclerosis.

You can have high total LDL cholesterol and be protected if your particles are predominantly large and buoyant. You can have low total LDL and be at risk if your particles are small and dense.

What causes small, dense LDL particles? Refined carbohydrates. Sugar. Vegetable oils. Not cholesterol. Not saturated fat. The foods that raise serum cholesterol aren't the problem. The foods that shift LDL particle size toward small and dense are.

Someone eating liver and eggs (high cholesterol, moderate saturated fat, no carbohydrates) is likely to have large, buoyant LDL particles, despite high total LDL. Someone eating bread and vegetable oil (low cholesterol, polyunsaturated fat, high refined carbohydrates) is likely to have small, dense LDL particles, despite lower total LDL.

Individual metabolic response: why some people respond differently

Here's the truth that nutrition science has finally accepted: cholesterol response to diet is highly individual.

Some people are genetic hyper-responders. They eat saturated fat and cholesterol, and their serum cholesterol rises significantly. Others are hypo-responders. They eat the same foods and show no meaningful increase.

This variation is genetic. You inherit your responsiveness. If your parents' cholesterol stayed low despite high fat intake, yours probably will too. If your parents' cholesterol rose with dietary fat, yours probably will.

For the majority of the population (hypo-responders), dietary cholesterol and moderate saturated fat have minimal effect on serum cholesterol. Organ meats are safe and protective. For a minority (hyper-responders), these foods have a stronger effect, and moderation or careful monitoring is wise.

The problem with blanket dietary guidelines is that they treat everyone as a hyper-responder. Most people aren't. Most people eating organ meats will see no change or improvement in cholesterol markers.

What actually raises serum cholesterol (hint: it's not liver)

If dietary cholesterol and saturated fat aren't the primary drivers of serum cholesterol, what is?

Refined carbohydrates. Sugar and flour raise serum triglycerides, shift LDL toward smaller particles, lower HDL, and increase inflammation. These effects are far more consistent and dramatic than any effect of dietary cholesterol.

Vegetable seed oils. The omega-6 polyunsaturated fat in seed oils promotes oxidation of LDL and chronic inflammation. They're more likely to be problematic than saturated fat.

Trans fats. Industrial trans fats from hydrogenated oils are genuinely damaging. They raise LDL, lower HDL, increase inflammation. This is the one dietary fat that is unambiguously harmful.

Chronic stress and poor sleep. These raise cortisol, which drives cholesterol synthesis and inflammation. Someone eating organ meats whilst chronically stressed will show worse cholesterol patterns than someone eating refined carbohydrates with good sleep and low stress.

Notice what's missing from this list? Cholesterol. Organ meats. Eggs. These are scapegoated foods with minimal actual impact on cardiovascular risk.

The research on organ meats and cardiovascular risk

There are virtually no studies linking organ meat consumption to increased cardiovascular risk. This is partly because organ meats have become rare in modern diets, making large-scale studies difficult. But the absence of evidence of harm is striking, given how much research has targeted red meat.

What research does show: people eating high amounts of processed meat (sausage, deli meats, bacon) show increased cardiovascular risk. People eating unprocessed red meat, including organ meats, show no consistent increase in cardiovascular risk. People eating organ meats benefit from exceptional nutrient density and show improvements in various biomarkers.

The cardiovascular risk from a modern diet comes from refined grains, seed oils, added sugar, and chronic stress. It does not come from liver, kidney, or heart.

The cholesterol in organ meats is irrelevant to your cardiovascular risk. The nutrients they provide are extraordinarily relevant to your health.

The fear of organ meats is a relic of outdated nutrition dogma. Modern research, when you actually read it, suggests that organ meats are among the most protective foods you can eat. Eat them with confidence.

References

1. 1. Soliman GA. Dietary Cholesterol and the Lack of Evidence in Cardiovascular Disease. Nutrients. 2018. https://pmc.ncbi.nlm.nih.gov/articles/PMC6024687/
2. 2. U.S. Department of Health and Human Services and U.S. Department of Agriculture. 2015–2020 Dietary Guidelines for Americans. https://odphp.health.gov/our-work/nutrition-physical-activity/dietary-guidelines/previous-dietary-guidelines/2015
3. 3. Siri-Tarino PW, Sun Q, Hu FB, Krauss RM. Meta-analysis of prospective cohort studies evaluating the association of saturated fat with cardiovascular disease. Am J Clin Nutr. 2010. https://pubmed.ncbi.nlm.nih.gov/20071648/
4. 4. Chowdhury R, et al. Association of dietary, circulating, and supplement fatty acids with coronary risk: a systematic review and meta-analysis. Ann Intern Med. 2014. https://pubmed.ncbi.nlm.nih.gov/24723079/