Are eggs actually bad for your cholesterol?
Eggs raise LDL slightly in most people and substantially in a minority, so the average effect hides how much the response varies between individuals. On heart disease itself, the biggest studies genuinely disagree.
For decades the rule was 300 mg of dietary cholesterol a day, about one and a half eggs. US guidance dropped that cap in 2015 and the internet read it as an acquittal. Not quite. The committee removed the number because a single hard threshold wasn’t well supported and was impractical to follow, not because dietary cholesterol turned out to be inert. The American Heart Association’s 2020 advisory landed in the same place: no target number, but no green light either.
The cap was shaky because eaten cholesterol and blood cholesterol are only loosely coupled. Your liver makes most of what circulates, and it throttles back when you eat more. That feedback loop absorbs a lot of what lands on your plate, but not all of it, and not equally in everyone.
In controlled feeding trials the effect is real and small. Pooling 17 RCTs, higher egg intake raised LDL by roughly 8 mg/dL versus control, with a modestly worse LDL/HDL ratio. Measurable, and nowhere near the catastrophe the old guidance implied.
Averages hide the hyper-responders
A subset of people are hyper-responders: feed them several eggs a day and LDL climbs noticeably, while most barely shift. Exactly how large that subset is varies by how you define it, but the practical point holds — the average LDL bump hides a wide spread, and you can’t tell from a population number which end you’re on. Nobody is going to screen you for this. You can screen yourself, though. Pull a lipid panel, hold your egg intake steady for eight to twelve weeks, pull another one. That n=1 beats any population average for deciding what you personally should do.
The outcome data genuinely splits
Six pooled US cohorts found each extra half-egg per day tracked with higher cardiovascular risk and mortality. A separate pooled analysis of 1.7 million people found nothing at up to an egg a day. Both are serious work, neither is a trial, and both are stuck with the same confound: eggs travel with bacon, butter, and buttered toast. The one recent randomized trial in high-risk adults found no lipid penalty from 12 eggs a week over four months.
Saturated fat moves LDL more reliably than yolks do, which is a different question with a different answer. On eggs specifically: a daily one is defensible for most people. If your LDL is already high, test yourself rather than assuming you’re in the majority.