Are Eggs Bad for Your Cholesterol? The 60-Year Flip-Flop, the 2025 Trial, and the Real Answer

Ask whether eggs are bad for your cholesterol and you will start a fight that has now run for sixty years. One side has the memory of a grandfather who ate three eggs every morning and lived to ninety-four. The other side has a headline from 2019: each extra half an egg a day linked to 6% more heart disease. Both sides have studies. Both sides have doctors. Both sides are convinced the other side is either bought, brainwashed, or innumerate. And both sides are quoting real research — which is exactly why the argument never ends.

The egg fight is really three arguments wearing one costume. The first is about biology: does the cholesterol you eat become the cholesterol in your blood? The second is about history: why did the official advice do a complete U-turn, and can you trust advice that changes? The third is about trust: who paid for the study that says eggs are fine? This article takes them in order, with the actual numbers attached, because the numbers are what settle it — and the numbers are more interesting than either slogan.

Where the egg fear started: 1968 and the 300-milligram rule

The fear has a birthday. In 1968, the American Heart Association advised Americans to limit dietary cholesterol to no more than 300 milligrams a day and no more than three eggs a week. A single large egg contains about 186 milligrams of cholesterol, almost all of it in the yolk, so one egg ate up nearly two-thirds of the day's allowance. The logic seemed airtight: cholesterol clogs arteries, eggs are full of cholesterol, therefore eggs clog arteries. Doctors repeated it, cookbooks printed egg-white omelette recipes, and a generation grew up treating the yolk as a small yellow grenade.

There was only one problem with the logic: it skipped a step. Eating cholesterol is not the same as having cholesterol in your blood. Your liver manufactures most of the cholesterol circulating in your body — only about 10% to 20% of blood cholesterol comes directly from what you eat — and when you eat more cholesterol, your liver typically compensates by making less. That feedback loop is why the 300-milligram rule was always shakier than it sounded. It also explains a result that confused researchers for decades: in study after study, feeding people extra dietary cholesterol moved their blood cholesterol only a little, or not at all, while feeding them saturated fat moved it a lot.

The 1968 rule also had a timing problem. It was issued before the large, long-running studies that could actually test whether egg eaters get more heart disease had finished. For the next forty years, those studies trickled in, and their results were stubbornly unimpressive for the anti-egg case. In generally healthy people, eating an egg a day was not associated with more heart disease. The rule survived anyway, because rules are easier to keep than to retract — and because "eggs raise cholesterol" is a sentence that sounds like it must be true.

The great reversal: 2015, and the limit quietly disappears

In 2015, the scientists who write the federal dietary guidelines did something nutrition authorities almost never do: they deleted the limit. The 2015–2020 Dietary Guidelines for Americans dropped the 300-milligram daily cholesterol cap entirely, with the advisory committee stating that the available evidence showed no appreciable relationship between dietary cholesterol and blood cholesterol for most people. The limit has never come back. Current US guidance still caps saturated fat at less than 10% of daily calories — about 20 grams a day for a typical adult — but it sets no numerical limit on dietary cholesterol at all.

The American Heart Association's own position followed the same path. Its 2019 science advisory on dietary cholesterol concluded that healthy people can include up to one whole egg a day as part of a heart-healthy eating pattern, and that healthy older adults with normal cholesterol levels can reasonably eat up to two a day, given eggs' nutritional value, convenience and low cost. Vegetarians who eat no meat may include more eggs still, since eggs are not competing with other animal sources of cholesterol on their plates.

This is the reversal the distrust camp points to, and it is worth stating plainly: yes, the official advice flipped. The people who told you three eggs a week in 1968 are telling you an egg a day now. But the flip was not a whim, and it was not a conspiracy. It was the slow accumulation of fifty years of evidence that dietary cholesterol, on its own, does not drive blood cholesterol the way everyone assumed in 1968. What the guidelines never flipped on is saturated fat — the 10% cap has survived every revision, because the evidence for it kept getting stronger while the evidence against dietary cholesterol kept getting weaker.

It is also worth saying what an egg actually is, because the debate treats it as a cholesterol delivery device and nothing else. A large egg gives you about 6 grams of protein, about 5 grams of fat — most of it the unsaturated kind — only about 1.6 grams of saturated fat, plus choline (about 147 milligrams, a nutrient many people under-consume), vitamin D, vitamin B12 and lutein, a pigment linked to eye health. Judged as a food rather than as a cholesterol number, it is a remarkably nutrient-dense package for very little saturated fat. That is why the guidelines now judge it by its whole profile instead of its cholesterol count alone.

The 2019 study that scared everyone again

Just as the egg was being rehabilitated, a major study landed that seemed to undo the whole reversal. In March 2019, Zhong and colleagues published a pooled analysis in JAMA of six prospective US cohorts — 29,615 adults followed for up to 31 years, with a median follow-up of 17.5 years. The headline numbers were alarming: each additional 300 milligrams of dietary cholesterol a day was associated with a 17% higher risk of cardiovascular disease and an 18% higher risk of death from any cause. Each additional half an egg a day was associated with a 6% higher risk of cardiovascular disease and an 8% higher risk of death. Newspapers ran the story under headlines like "Eggs Raise the Risk for Heart Disease and Death," and the egg fight reignited overnight.

Read the study itself, though, and the picture gets more complicated. First, it was observational: it tracked what people reported eating and what happened to them, which can show an association but cannot prove that the eggs caused the heart disease. People who eat a lot of eggs also tend to eat a lot of bacon, sausage and butter, smoke more, exercise less and eat fewer vegetables — and although the researchers adjusted for many of these factors, no adjustment is perfect. Second, the study measured diet once, at the start, and then followed people for up to three decades. Anyone who changed their diet after a cholesterol scare — which millions of people did — was still counted by their original answers. Third, and most tellingly, when the researchers adjusted for total dietary cholesterol intake, the association between egg consumption itself and heart disease was no longer significant. In other words, the study's own data said the risk tracked with cholesterol from all sources combined, not with eggs specifically.

Harvard's Nutrition Source, reviewing the study the same week, made the same point: the findings should be interpreted alongside several previous studies showing that low to moderate egg intake is not associated with higher cardiovascular risk in generally healthy people. And the later evidence backed that caution. A 2021 meta-analysis in the American Journal of Medicine pooled 23 studies covering more than 1.4 million people and found that eating more than one egg a day was not linked to a higher risk of heart disease than eating one egg or less a day, over about twelve years of follow-up. A 2020 study of about 177,000 people across 50 countries found that eating seven or more eggs a week, compared with less than one a week, was not tied to higher rates of heart attack, stroke or heart failure, or to abnormal cholesterol levels. The 2019 study is real, and its numbers are real — but it is one observational study against a larger body of work pointing the other way, and its own fine print undercuts the "eggs kill" reading.

The 2025 trial that separated eggs from saturated fat

The reason the debate kept going in circles is that almost every study before 2025 tested eggs and saturated fat together. People who eat more eggs usually eat more saturated fat, so the two were tangled in every dataset. The 2025 trial, published in the American Journal of Clinical Nutrition, was designed to untangle them — the first study to vary dietary cholesterol and saturated fat independently, in the same people.

The design was elegant. Sixty-one healthy adults, average age 39, average LDL cholesterol 135 mg/dL, were assigned to three diets in random order, five weeks each, with the same number of calories throughout. One diet was high in cholesterol (600 mg a day) and low in saturated fat (6% of calories), including two eggs a day. One was low in cholesterol (300 mg a day) and high in saturated fat (12% of calories), with no eggs at all. The third was a control: high in both cholesterol and saturated fat, with at most one egg a week. Forty-eight people completed all three diet phases.

The results were unambiguous. Compared with the control diet, the two-eggs-a-day diet lowered LDL cholesterol — from 109.3 mg/dL on the control diet to 103.6 mg/dL on the egg diet, a drop of about 5.7 mg/dL. The egg-free, high-saturated-fat diet did not lower LDL at all. Across all three diets, saturated fat intake tracked closely with LDL levels, while dietary cholesterol intake showed no significant relationship with LDL whatsoever. The authors' conclusion, in their own words: saturated fat, not dietary cholesterol, elevates LDL cholesterol — and eating two eggs daily as part of a low-saturated-fat diet lowers LDL, which may reduce cardiovascular risk.

Two honest caveats belong here, and the first is about money. The trial was funded by the Egg Nutrition Center, a division of the American Egg Board, and three of the six authors report financial support from the Egg Nutrition Center. The paper states that the funder had no role in the design of the study, the analysis or interpretation of the data, or the writing of the manuscript — and the study was pre-registered, randomised and crossover-controlled, which makes it hard to rig quietly. But industry funding is a legitimate reason to scrutinise a study, and the right response is to check whether its results match independent evidence. They do: the large cohort meta-analyses that found no link between moderate egg intake and heart disease were not egg-industry studies. The trial's result is consistent with the wider literature, not an outlier bought into existence.

The second caveat is about size and duration. Sixty-one people for five weeks per diet is enough to measure LDL cholesterol, which responds to diet within weeks — but it is not enough, and not long enough, to measure heart attacks. The trial proves that eggs, without saturated fat, do not raise LDL in the short term. It does not prove that eating two eggs a day for thirty years is harmless. Nobody has run that study, because nobody can run a thirty-year randomised trial of breakfast. The honest claim is narrower than the headlines: eggs do not raise your LDL the way saturated fat does, and in a low-saturated-fat diet they may even lower it slightly.

What actually raises your LDL — and by how much

If dietary cholesterol is a minor player, what is the major one? Saturated fat, and the mechanism is well understood. Saturated fat hinders the liver's ability to clear LDL from the blood and ramps up production of the particles that carry it, so more LDL circulates for longer. The American Heart Association recommends keeping saturated fat under about 13 grams a day; the dietary guidelines cap it at under 10% of calories, roughly 20 grams a day for a typical adult. Replacing even 5% of saturated fat intake with unsaturated fat is associated with a 15% to 25% lower risk of heart disease — a far bigger lever than anything to do with egg yolks.

The numbers make the point concrete. A large egg carries about 1.6 grams of saturated fat. A single rasher of bacon carries about 1 gram — and nobody eats one rasher. Two rashers of bacon, a sausage and a spoonful of butter fried into the same breakfast can easily add 12 to 15 grams of saturated fat, roughly the entire daily allowance, before the egg has done anything at all. This is why the phrase "eggs and bacon" is doing so much quiet damage in the debate: the studies that linked heavy egg consumption to heart disease were largely studying heavy egg-and-bacon consumption, and the bacon was doing the heavy lifting.

There is a second mechanism that rarely gets mentioned. Your liver's cholesterol production is regulated by a feedback loop: eat more cholesterol, make less. Eat less cholesterol, make more. That is why cutting eggs out of a diet that is still full of saturated fat does almost nothing to blood cholesterol — the liver simply makes up the difference, while the saturated fat keeps pushing LDL up. The 2025 trial demonstrated this in miniature: the egg-free diet, which removed the cholesterol but kept the saturated fat high, did not lower LDL at all. Removing the yolk and keeping the fry-up is the worst of both worlds.

The two camps, stated fairly

Camp A — "Eggs are a superfood, and the cholesterol scare was a hoax." Its strongest argument is the trial evidence: the 2025 randomised study, the big meta-analyses, and the AHA's own one-to-two-eggs-a-day allowance all point the same way. Eggs are nutrient-dense, cheap, and low in saturated fat, and the 1968 rule was built on a mistaken assumption about how dietary cholesterol works. Its weakest habit is turning a qualified verdict into an absolute one. "Eggs don't raise LDL in a low-saturated-fat diet" becomes "eat as many eggs as you want," and the hyper-responders, the diabetics and the funding question get waved away. It also tends to quote the 2025 trial as if a five-week study of 61 people settled a thirty-year question. It did not. It answered the LDL question, which is important — but it is not a lifetime safety certificate.

Camp B — "Eggs will clog your arteries, and the guidelines were bought." Its strongest argument is the 2019 JAMA study and the basic caution that dietary cholesterol is still cholesterol: 186 milligrams a yolk is a lot of cholesterol to dismiss entirely, and the long-term data on very high egg intakes is thin. Its funding scepticism is also legitimate — the 2025 trial really was funded by the Egg Nutrition Center, and the egg industry really does fund research that favours eggs. Its weakest habit is false precision and false equivalence. The "6% more heart disease per half egg" figure comes from one observational study whose own authors found the egg association vanished after adjusting for total dietary cholesterol, and treating an egg as equivalent to a sausage because both contain cholesterol ignores the saturated fat that actually drives LDL. It also has a perverse consequence: if people who eat eggs every morning switch to a "heart-healthy" breakfast of refined cereal and orange juice, they may end up eating more sugar and less protein, which is not obviously a win.

The exceptions: when eggs really do deserve caution

A verdict for "most healthy adults" is not a verdict for everyone, and the exceptions matter — because the people in them are exactly the people most likely to be searching this question. The first group is the hyper-responders: roughly a quarter of people whose blood cholesterol rises more noticeably with dietary cholesterol, probably for genetic reasons. They are hard to identify without a blood test, which is why the practical advice for anyone is to check their numbers rather than assume they are in the lucky three-quarters. If your LDL jumps after you start eating eggs daily, you may be one of them — and for you, the general verdict does not apply.

The second group is people with diabetes. Several large cohort studies have found higher heart-disease risk among people with diabetes who eat an egg or more a day, a pattern that does not show up in people without diabetes. The reasons are still debated — diabetes changes how the body handles cholesterol and fats — but the association has appeared often enough that cardiologists commonly advise people with diabetes to be more conservative, around three or four eggs a week rather than one a day.

The third group is people with familial hypercholesterolemia, an inherited condition affecting about 1 in 250 people, in which LDL cholesterol runs very high from birth regardless of diet. For them, dietary cholesterol is an unnecessary addition to an already overloaded system, and their doctors will typically advise limiting eggs. The fourth group is anyone whose LDL is already high or who has established heart disease: the AHA advises these people to reduce both saturated fat and dietary cholesterol together, since the two contribute more to plaque build-up combined than either does alone. None of this contradicts the main verdict. It refines it: eggs are fine for most people, and "most people" is doing real work in that sentence.

At a glance: claim vs evidence

Claim you will hear	What the evidence actually says
Eggs raise your cholesterol because they contain cholesterol	Only weakly, for most people. Your liver makes most blood cholesterol and turns production down when you eat more. Only about 10–20% of blood cholesterol comes directly from food.
An egg a day is dangerous	Not supported for healthy adults. The AHA allows up to one whole egg a day, and up to two a day for healthy older adults. A meta-analysis of 23 studies and 1.4 million people found no extra heart risk above one egg a day.
The 2019 JAMA study proves eggs cause heart disease	It found an association, not proof: half an egg a day was linked to 6% higher cardiovascular risk and 8% higher mortality. But it was observational, measured diet once over 31 years, and the egg link vanished after adjusting for total dietary cholesterol.
Two eggs a day lowered cholesterol in a 2025 trial	True, with context. In a randomised crossover trial of 61 adults, two eggs a day on a low-saturated-fat diet lowered LDL from 109.3 to 103.6 mg/dL over five weeks. The trial was funded by the Egg Nutrition Center, though the funder had no role in design or analysis — and the result matches independent cohort studies.
The guidelines flipped, so nutrition science cannot be trusted	The cholesterol limit was dropped in 2015 because fifty years of evidence showed no appreciable link between dietary cholesterol and blood cholesterol. The saturated-fat cap never flipped — it has survived every revision.
It is the bacon, not the egg	Largely true. Saturated fat, not dietary cholesterol, is the main dietary driver of LDL. An egg has about 1.6 g of saturated fat; a full fry-up with bacon, sausage and butter can add 12–15 g before the egg matters.
Some people really are harmed by eggs	True. Roughly a quarter of people are hyper-responders whose LDL rises more with dietary cholesterol. People with diabetes, familial hypercholesterolemia (about 1 in 250 people) or very high LDL should be more cautious and follow their clinician's advice.
Egg whites are the safe option, yolks are poison	Half true. The white is pure protein with no cholesterol; the yolk holds the cholesterol — but also the choline, vitamin D, B12 and lutein. Dropping the yolk removes the nutrients with the cholesterol, and for most people the cholesterol was not the problem.
Eggs are a superfood, eat as many as you want	Overreach. The evidence supports one to two eggs a day for healthy adults, not unlimited eggs. Very high intakes have thin long-term data, and the 2025 trial lasted five weeks per diet, not thirty years.

Popular opinions: how divided people actually are

The arguments below are paraphrased from the recurring positions in forums, social media threads and comment sections — not quoted posts, and no usernames are invented or cited. They show the real shape of the divide, which is not "science versus ignorance" but different answers to different questions.

"My grandfather ate three eggs every morning and lived to ninety-four." The anecdote camp, and the most common defence of eggs online. Its strength is that it matches the trial data: plenty of people eat eggs daily for decades without heart disease. Its weakness is survivorship bias — you hear about the grandfathers who lived to ninety-four, not the ones who died at sixty-two, and the grandfather in question probably also walked everywhere, smoked nothing and ate no ultra-processed food. Verdict: a true story that proves eggs are not poison, not that they are harmless for everyone.

"The guidelines flipped, so you cannot trust any of it." This camp is right that the advice changed, and wrong about what that means. Guidelines that never change in the face of new evidence would be worse, not better. The cholesterol limit was dropped because the evidence accumulated against it, while the saturated-fat cap survived because the evidence for it kept strengthening. Verdict: a real reversal, misread as proof that all nutrition advice is guesswork.

"The 2019 JAMA study proves it — 6% more heart disease per half egg." This camp is quoting a real study with real numbers, and ignoring what the study itself says. The association was observational, the diet was measured once over thirty years, and the egg link disappeared once total dietary cholesterol was accounted for. Verdict: a true citation used to close a debate it does not close.

"It is the bacon, not the egg." The food-context camp, and the one the 2025 trial supports most directly. Its strength is the mechanism: saturated fat drives LDL, and the fry-up delivers far more saturated fat than the egg. Its weakness is that it can slide into absolution — "eggs are fine, eat the whole fry-up" — when the trial actually tested eggs inside a low-saturated-fat diet, not eggs on top of a high one. Verdict: the most accurate slogan in the debate, as long as it is not used to excuse the bacon.

"The 2025 study was paid for by the egg industry, so it is worthless." The funding sceptic, and the only camp whose core fact is beyond dispute: the Egg Nutrition Center funded the trial, and three of six authors report financial support from it. Its weakness is overreach: the study was pre-registered, randomised and crossover-controlled, the funder had no stated role in design or analysis, and its result matches independent meta-analyses that the egg industry did not fund. Verdict: a real conflict to disclose and scrutinise, not a reason to dismiss the result outright.

"I eat six eggs a day and my cholesterol is perfect." The biohacker camp, and the most visible one on social media. Its strength is that it is often true — a single normal lipid panel after years of heavy egg eating is a real data point. Its weakness is that one person's panel is not a population study, that heavy egg eaters are often also low-carb, high-exercise and non-smoking, and that a normal LDL at forty says nothing about plaque at sixty. Verdict: a true personal result that proves nothing about the other three-quarters of the population, or about the person making the claim in twenty years.

Notice the pattern, familiar from every food fight: each side reads the same facts as proof of its own position. One side hears "dietary cholesterol barely matters" and stops listening. The other hears "industry-funded" and stops listening. The official position — an egg or two a day is fine for most healthy adults, in a diet that is not loaded with saturated fat, with real exceptions for real conditions — is less satisfying than either slogan, because it requires you to ask who is asking, and what else is on the plate, before you answer. That is not evasion. It is the answer.

How to decide for yourself

A practical approach that follows the evidence, rather than a camp, looks like this. If you are a healthy adult with normal cholesterol, an egg a day fits comfortably in a heart-healthy diet, and two a day is reasonable if the rest of your diet is low in saturated fat — the AHA's allowance for healthy older adults. Cook them in a way that does not add saturated fat: poached, boiled or fried in a small amount of olive oil rather than butter, and keep the bacon, sausage and cheese as the occasional treat rather than the daily default. If your LDL is high, get your numbers checked before and after a change in egg intake — that is the only way to know whether you are one of the roughly one-in-four hyper-responders, and a blood test beats an internet argument every time. If you have diabetes, familial hypercholesterolemia or established heart disease, be more conservative — around three or four eggs a week is the common clinical suggestion — and follow your clinician's advice over any general statement in an article, including this one. And if you are currently eating eggs every day with a full fry-up, the single most useful change is not dropping the egg: it is dropping the saturated fat around it.

Eggs are not bad for your cholesterol, for most people, in the way the 1968 warning claimed. They are not a superfood with no limits either. They are a cheap, nutrient-dense food carrying 186 milligrams of cholesterol and only 1.6 grams of saturated fat, in a body that makes most of its own cholesterol and adjusts to what you eat. The sixty-year argument was never really about the egg. It was about whether a single nutrient could explain a disease, whether advice that changes can be trusted, and whether a study paid for by an industry can be believed. The answers, in order: no, yes — when it changes because the evidence changed — and yes, when the result matches the evidence that nobody paid for. The egg survived the argument. The fry-up did not.

Frequently asked questions

Are eggs bad for your cholesterol?

For most healthy adults, no. The cholesterol in an egg yolk has only a small effect on blood cholesterol, because your liver makes most of it and adjusts production when you eat more. The AHA says up to one whole egg a day fits a heart-healthy diet, and up to two a day for healthy older adults. What raises LDL cholesterol is mainly saturated fat, not dietary cholesterol.

How many eggs can I eat a day?

One a day is the standard allowance for healthy adults; healthy older adults with normal cholesterol can reasonably eat two a day. If you have diabetes, very high LDL or familial hypercholesterolemia, around three or four eggs a week is the more common clinical suggestion — ask your clinician, since personal targets beat general ones.

Do eggs raise LDL cholesterol?

Barely, for most people — and in the right context, not at all. A 2025 randomised trial found two eggs a day on a low-saturated-fat diet actually lowered LDL by about 5.7 mg/dL over five weeks. But roughly a quarter of people are hyper-responders whose LDL rises more with dietary cholesterol, so the only way to know your own response is a blood test.

What caused the confusion about eggs and cholesterol?

In 1968 the American Heart Association advised limiting dietary cholesterol to 300 mg a day and eggs to three a week, assuming eaten cholesterol became blood cholesterol. Decades of research showed the link was weak — the liver compensates — so the 2015 dietary guidelines dropped the cholesterol limit entirely. A 2019 JAMA study then reignited the scare with an observational link, before the 2025 trial separated eggs from saturated fat and pointed at the fat instead.

Are egg whites safer than whole eggs?

The white is pure protein with no cholesterol; the yolk holds the cholesterol plus the choline, vitamin D, B12 and lutein. For most people the cholesterol in the yolk is not the problem, so dropping it removes nutrients without much benefit. If your clinician has told you to limit dietary cholesterol specifically, whites are the practical workaround.

Is it the egg or the bacon?

Mostly the bacon — or more precisely, the saturated fat. An egg carries about 1.6 g of saturated fat; a fry-up with bacon, sausage and butter can add 12–15 g, roughly a whole day's allowance. Studies that linked heavy egg eating to heart disease were largely studying heavy egg-and-bacon eating, and the 2025 trial found the egg-free, high-saturated-fat diet did not lower LDL at all.

Sources and further reading

• Carter S, Hill AM, Yandell C, Wood L, Coates AM, Buckley JD, "Impact of dietary cholesterol from eggs and saturated fat on LDL cholesterol levels: a randomized cross-over study", The American Journal of Clinical Nutrition, 2025;122(1):83–91 — the trial behind the two-eggs-a-day result; funded by the Egg Nutrition Center, a division of the American Egg Board, with the funder having no role in design, analysis or writing. DOI: 10.1016/j.ajcnut.2025.05.001.
• Zhong VW et al., "Associations of Dietary Cholesterol or Egg Consumption With Incident Cardiovascular Disease and Mortality", JAMA, 2019;321(11):1081–1095 — the pooled analysis of 29,615 adults linking each additional 300 mg of dietary cholesterol a day to 17% higher cardiovascular risk. Full text: https://pmc.ncbi.nlm.nih.gov/articles/PMC6439941/
• Harvard T.H. Chan School of Public Health, The Nutrition Source, "Eggs and cholesterol back in the spotlight in new JAMA study", March 2019 — the context the headlines missed: a single diet measure, and the egg association vanishing after adjustment. https://nutritionsource.hsph.harvard.edu/2019/03/18/eggs-and-cholesterol-back-in-the-spotlight-in-new-jama-study/
• American Heart Association, "Dietary Cholesterol and Cardiovascular Risk: A Science Advisory From the American Heart Association", Circulation, 2020 — healthy people can include up to one whole egg a day; healthy older adults up to two.
• Krittanawong C et al., "Association Between Egg Consumption and Risk of Cardiovascular Outcomes: A Systematic Review and Meta-Analysis", American Journal of Medicine, 2021;134(1):76–83 — 23 studies, more than 1.4 million people: more than one egg a day not linked to higher heart-disease risk than one or fewer.
• Dehghan M et al., "Association of egg intake with blood lipids, cardiovascular disease, and mortality in 177,000 people in 50 countries", The American Journal of Clinical Nutrition, 2020 — seven or more eggs a week not tied to higher cardiovascular risk than less than one a week.
• Dietary Guidelines for Americans, 2015–2020 — the edition that dropped the 300 mg daily cholesterol limit, and the 2025–2030 edition that keeps saturated fat under 10% of calories.
• Health.com, "How Eggs Affect Cholesterol Levels" — plain-language summary of the 2025 trial, including the 5.7 mg/dL LDL drop and the caveats for familial hypercholesterolemia. https://www.health.com/research-shows-eggs-dont-raise-cholesterol-what-does-11777986
• National Geographic, "The truth about egg yolks and cholesterol" — the history of the 300 mg rule, the liver's role, and the saturated-fat mechanism. https://www.nationalgeographic.com/health/article/egg-yolks-cholesterol-heart-disease
• Marion Nestle, Food Politics, "Industry-funded study of the week: Eggs", October 2025 — the funding disclosure for the Carter trial, quoted from the paper itself. https://www.foodpolitics.com/2025/10/https-www-foodpolitics-com-2025-10-27917/

This article is for general information only and is not medical advice. If you have high cholesterol, diabetes, familial hypercholesterolemia or heart disease, or if you are concerned about your own cholesterol levels, speak to a clinician about your personal situation before changing your diet.

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