It's best to avoid eating raw eggs. Many people who dine out for breakfast order sunny-side-up eggs (where only one side is cooked, leaving the yolk runny), believing this method preserves tenderness and maximizes nutrient absorption. In reality, frequent consumption of sunny-side-up eggs poses significant health risks.
First, raw eggs are prone to contamination by pathogenic bacteria. Since eggs originate from a hen's ovary and cloaca—organs with high bacterial carriage rates—the eggshell surface and even the yolk may be contaminated.Under a microscope, the eggshell is seen to be covered with tiny pores. These pores are dozens to hundreds of times larger in diameter than pathogenic bacteria. Consequently, eggs are constantly vulnerable to pathogen invasion. Consuming such eggs may lead to food poisoning symptoms like chills, fever, nausea, vomiting, and diarrhea.
Secondly, raw eggs contain two harmful substances: antienzyme proteins and avidin. The former inhibits the interaction between proteases in the human gastrointestinal tract and proteins, impairing protein digestion and absorption. The latter binds to biotin in food, forming a compound that cannot be absorbed by the human body. This can easily lead to biotin deficiency, causing symptoms such as mental fatigue, muscle soreness, and hair loss.However, when eggs are boiled or fried, these harmful substances are destroyed, no longer affecting the body's absorption of nutrients.
Thirdly, the protein structure in raw eggs is tightly packed, making a significant portion indigestible. Only after cooking does the protein become soft and easily broken down and absorbed by the digestive tract.Studies show that the digestibility of raw or undercooked eggs is 30%–50% lower than that of cooked eggs.
Finally, raw eggs carry a distinct fishy odor that suppresses the central nervous system. This reduces secretion of digestive fluids like saliva, gastric juice, and intestinal fluids, leading to decreased appetite, indigestion, and even nausea or vomiting.
In comparison, double-sided fried eggs are slightly healthier than single-sided ones. However, fried eggs remain prone to cancer-inducing risks. This is because eggs tend to char during frying, and charred parts may contain carcinogens. Additionally, frequent consumption of fried eggs can lead to excessive fat intake, potentially causing hyperlipidemia and fatty liver disease. These concerns are by no means exaggerated.
The above outlines the risks of consuming raw eggs. The optimal way to eat eggs is boiled, which also preserves more nutrients. However, experts recommend boiling for 8–10 minutes. This duration effectively kills harmful pathogens while retaining most of the egg's nutritional value.