Why eggs don't raise your cholesterol: saturated fat is the real culprit
For decades, eggs were villainized because their yolks are high in cholesterol. But a landmark 2025 randomized controlled trial directly tested this: 48 adults ate three different diets for five weeks each. One diet included two eggs daily with low saturated fat (6% of calories), another had no eggs but high saturated fat (12% of calories), and a control diet had both high cholesterol and high saturated fat. The result? The high-saturated-fat, no-egg diet did not lower LDL cholesterol, but the two-eggs-per-day, low-saturated-fat diet significantly lowered LDL by about 5% (from 109 to 104 mg/dL) [1][2]. Across all diets, the researchers found that for every increase in saturated fat intake, LDL cholesterol rose significantly, but dietary cholesterol intake had zero relationship with LDL levels [1][2]. This means the fat you eat with your eggs—like butter, bacon, or cheese—matters far more than the eggs themselves.
Your body has a built-in feedback loop: when you eat more cholesterol from food, your liver simply produces less of its own. A 2024 comprehensive review of the evidence confirms that moderate egg consumption has little effect on blood lipids because the body adjusts its endogenous (internal) cholesterol production in response to dietary intake [5]. This is why population studies that adjust for overall diet quality often find no link between egg intake and heart disease risk.
What the numbers show for children, people with diabetes, and heavy egg eaters
The evidence is consistent across age groups. A 2022 randomized trial in 635 schoolchildren (ages 8–14) found that eating 10 whole eggs per week for 34 weeks actually decreased total cholesterol, triglycerides, and LDL cholesterol compared to a control group, while HDL ("good") cholesterol trended upward [3]. The children also grew more—gaining an extra 3.6 kg and 5.1 cm in height over the control group—with no adverse effects on their cholesterol [3].
However, the picture is more nuanced for people with type 2 diabetes. A 2023 review of high-quality studies noted that observational studies sometimes link higher egg intake to increased diabetes risk, but randomized controlled trials—the gold standard—find no effect of higher egg intake on markers of diabetes or heart disease in people who already have the condition [7]. The same review concluded that for the general population, higher egg consumption is associated with a null effect or even a modest reduced risk of cardiovascular disease [7].
What about eating many eggs daily? A 2022 meta-analysis of 19 studies involving 1.7 million people found that each additional egg per day was linked to an 8% higher risk of all-cause mortality and a 16% higher risk of cancer mortality [4]. However, the authors rated the certainty of this evidence as "very low" because the association disappeared in studies that properly adjusted for blood cholesterol levels, suggesting that the people eating many eggs also had other unhealthy habits [4]. The bottom line: for most people, 1–2 eggs daily within a healthy, low-saturated-fat diet is safe and may even improve cholesterol profiles.
How you cook your eggs and your personal sensitivity matter
Not all eggs are equal once they hit the pan. A 2024 review found that cooking method significantly changes the nutritional impact of eggs: soft-boiled eggs are generally the most healthful, while frying in butter or oil adds saturated fat that can negate any benefits [5]. The same review notes that a small subset of people—called "hyper-responders"—experience a modest rise in both LDL and HDL cholesterol when eating dietary cholesterol, but this pattern is not linked to increased heart disease risk [5].
Even in animal studies, the dose matters. A 2022 rat study found that supplementing with 3% egg yolk (a moderate amount) did not raise cholesterol, but 5% and 10% levels did increase total cholesterol and triglycerides [6]. This reinforces the principle: moderation is key, and for humans, 1–2 eggs per day falls well within the safe range for the vast majority.
Sources used in this answer
Eggs do not raise blood cholesterol: results of a randomised controlled trial
A 2025 randomized trial in 48 adults found that eating two eggs daily on a low-saturated-fat diet lowered LDL cholesterol by about 5% compared to a high-saturated-fat diet with only one egg per week; saturated fat intake, not dietary cholesterol, was linked to higher LDL.
Impact of dietary cholesterol from eggs and saturated fat on LDL cholesterol levels: a randomized cross-over study.
The same 2025 trial confirmed that across all diets, saturated fat intake was positively correlated with LDL cholesterol (β=0.35, p=0.002), while dietary cholesterol showed no relationship (β=−0.006, p=0.42).
Long Term Whole Egg, but Not Egg White Supplementation Promotes Growth and Bifidobacteria and Lachnospira Without Increasing LDL-Cholesterol in Primary School Children
A 2022 trial in 635 schoolchildren found that eating 10 whole eggs per week for 34 weeks decreased total cholesterol, triglycerides, and LDL cholesterol, and increased height and weight, with no adverse effects on blood lipids.
Egg consumption and risks of all-cause and cause-specific mortality: a dose–response meta-analysis of prospective cohort studies
A 2022 meta-analysis of 19 studies (1.7 million people) found each additional egg per day was linked to an 8% higher all-cause mortality risk, but the evidence was rated very low certainty and the association disappeared after adjusting for blood cholesterol.
Association between egg consumption and risk of obesity: A comprehensive review
A 2024 review concluded that moderate egg consumption has little effect on blood lipids because the body regulates endogenous cholesterol production; soft-boiled eggs are the most healthful cooking method.
Evaluation of the effects of egg yolk on serum cholesterol level and liver function in rats
A 2022 rat study found that 3% egg yolk supplementation did not raise cholesterol, but 5% and 10% levels increased total cholesterol and triglycerides, suggesting a dose threshold.
Eggs: Healthy or Risky? A Review of Evidence from High Quality Studies on Hen’s Eggs
A 2023 review of high-quality studies found that higher egg consumption is associated with a null effect or modest reduced risk of cardiovascular disease in the general population, but observational data on diabetes are inconsistent with trial data.