Eggs have been at the center of a nutrition debate for decades. Many people have been told to limit the number of eggs they eat because eggs contain cholesterol, and cholesterol was once believed to be a major cause of heart disease.
As a result, countless people avoided eggs or ate only egg whites, believing this would protect their hearts. However, scientists have continued to study the relationship between diet and heart health, and newer research is changing what experts know about cholesterol, saturated fat, and healthy eating.
A new study from the University of South Australia now provides fresh evidence that may finally put one of the biggest nutrition myths to rest.
The researchers found that eggs themselves do not appear to raise levels of LDL cholesterol, often called the “bad” cholesterol, when they are eaten as part of a diet that is low in saturated fat. Their findings were published in The American Journal of Clinical Nutrition.
Heart disease remains the leading cause of death around the world. Every year it claims about 18 million lives globally. In Australia, someone dies from heart disease about every 12 minutes, making it responsible for roughly one in every four deaths. Because heart disease is so common, understanding which foods increase or reduce risk is an important public health goal.
For many years, people believed that eating foods high in cholesterol automatically raised cholesterol levels in the blood. Eggs became one of the main foods people avoided because a single egg contains a relatively large amount of dietary cholesterol.
However, scientists have gradually discovered that the picture is much more complicated. Different nutrients affect the body in different ways, and not all foods that contain cholesterol have the same effect on heart health.
The research team wanted to separate the effects of dietary cholesterol from the effects of saturated fat. Saturated fat is found in foods such as bacon, sausages, fatty cuts of meat, butter, full-fat dairy products, pastries, and many fried and processed foods.
Previous studies have suggested that saturated fat may play a much larger role in raising LDL cholesterol than cholesterol found naturally in foods like eggs.
The researchers carefully examined how these two dietary factors influenced LDL cholesterol. LDL cholesterol is often called “bad” cholesterol because high levels can lead to fatty deposits building up inside arteries. Over time, these deposits narrow the arteries and increase the risk of heart attacks and strokes.
The results were surprising to many people. The study showed that eggs, despite being naturally high in cholesterol, did not increase LDL cholesterol when they were eaten as part of a diet that was low in saturated fat. Instead, foods that contained large amounts of saturated fat were responsible for the increase in LDL cholesterol.
Professor Jon Buckley, who led the research, said eggs have been unfairly blamed for many years because older dietary advice focused mainly on cholesterol. According to the study, the real concern is often what people eat alongside their eggs rather than the eggs themselves.
A breakfast of eggs served with bacon, sausages, fried foods, or other high-fat items contains much more saturated fat, which is far more likely to affect cholesterol levels.
This finding helps explain why recent nutrition guidelines in many countries no longer recommend strict limits on egg consumption for most healthy people.
Eggs are packed with high-quality protein and provide important nutrients such as vitamin D, vitamin B12, choline, selenium, and several antioxidants that support eye health. They are also filling, making them a popular choice for breakfast and other meals.
The researchers stress that overall eating patterns remain more important than focusing on a single food. A healthy diet includes plenty of vegetables, fruits, whole grains, legumes, nuts, seeds, and healthy fats while limiting foods that are high in saturated fat, added sugar, and excess salt. Within this type of eating pattern, eggs can fit comfortably into a balanced diet.
The findings also do not mean that people should ignore medical advice from their healthcare providers. Some individuals have inherited cholesterol disorders or other health conditions that require personalised dietary recommendations.
For most healthy adults, however, current evidence suggests that eggs can be enjoyed regularly without increasing heart disease risk, provided the overall diet is balanced.
Overall, this research provides strong evidence that eggs have been misunderstood for many years. Rather than worrying about the cholesterol inside eggs, people may benefit more from paying attention to the amount of saturated fat they eat.
Choosing eggs with vegetables, wholegrain toast, or other nutritious foods instead of processed meats may be a better way to support long-term heart health.
If you care about nutrition, please read studies that whole grain foods could help increase longevity, and vitamin D supplements strongly reduce cancer death.
For more information about nutrition, please see recent studies about natural coconut sugar that could help reduce blood pressure and artery stiffness, and whey and soy protein may reduce inflammation in older people.
The study was published in The American Journal of Clinical Nutrition.
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