Eggs are one of the most common foods in the world. Some people start their morning with them, others incorporate them into a salad or a quick dinner, and for years they have stood at the center of countless nutritional debates. Once warned against for their cholesterol, later praised for their protein and nutritional value, a new study now places them once again at the center of attention, this time in the context of brain health.
A large–scale study published recently found an intriguing link between egg consumption and a reduced risk of cognitive decline in older age. Researchers tracked tens of thousands of participants over a period of years and discovered that even a relatively moderate consumption of eggs was associated with a significant advantage.
The study was based on data from more than 39 thousand people aged 65 and older who participated in the large Adventist Health Study 2 in the United States. Throughout the years, participants were asked about their dietary habits, including the frequency of eating eggs, and the researchers tracked their health status for an average of about 15 years.
When the researchers compared the eating habits with the medical diagnoses that developed later, they identified a clear trend: People who ate eggs regularly had a lower risk of developing significant cognitive decline.
According to the data, even eating eggs only once to three times a month was associated with a 17 percent decrease in risk. Among those who ate eggs two to four times a week, a 20 percent decrease was observed, while among those who ate eggs at least five times a week, a 27 percent decrease was observed.
Why eggs specifically?
According to the researchers, eggs contain several nutritional components that are particularly important for brain activity.
One of the central ones among them is choline, a substance that the body uses to produce acetylcholine: A neurotransmitter with a central role in memory, learning, and attention. Previous studies have already shown that people suffering from cognitive decline often have lower levels of acetylcholine and damage to the cells that produce it.
One hard–boiled egg contains about 27 percent of the recommended daily intake of choline, making it one of the richest dietary sources of this component.
Beyond that, eggs also contain antioxidants such as lutein and zeaxanthin. These are natural pigments that are also found in green vegetables and corn, and are considered substances that may assist in reducing inflammation and oxidative stress in neural tissues.
In addition, eggs provide omega–3 and phospholipids: Healthy fats that support cell structure and the capacity for communication between nerve cells.
Not only eggs: What else is important for the brain?
Experts emphasize that there is no single magic food that can guarantee a healthy brain over the years. Numerous studies indicate that a Mediterranean–style diet, based on vegetables, fruits, legumes, fish, olive oil, and whole grains, is associated with better preservation of brain functions. Dietary patterns such as DASH and MIND have also been linked in recent years to a lower risk of cognitive decline and dementia.
But diet is only part of the picture. Regular physical activity, quality sleep, social activity, intellectual stimulation, and stress reduction are all considered important factors in maintaining brain health over the years.
So how many eggs is it really advisable to eat? Nutrition experts explain that for most healthy people, eating eggs in moderation is considered safe and can even be part of a balanced and healthy menu.
In recent years, many health organizations have already moved away from the old approach that warned against eggs sweepingly, especially when they are consumed as part of a balanced diet.
However, people with certain heart diseases, particularly high cholesterol, or other medical conditions still need to consult a doctor or a dietitian regarding the amount that is appropriate for them.
Meanwhile, the new study adds another layer to the scientific debate surrounding one of the simplest and most popular foods in the world: It serves as a reminder that even our small habits in the kitchen may have a long–term impact on health.