Eggshells are prone to harboring pathogens. Salmonella-induced food poisoning is highly prevalent. Globally, Salmonella-related foodborne illnesses consistently rank among the most common bacterial food poisoning cases, and such incidents are not uncommon in mainland China either.
Salmonella bacteria are the causative agent of salmonellosis, a zoonotic disease transmitted between animals and humans. Meat and poultry eggs are the primary sources of human infection with this pathogen.Salmonella infection poses a life-threatening risk to children, frail women, and the elderly, significantly compromising the immune systems of vulnerable individuals. It also threatens the health of otherwise healthy adults. While infected adults typically experience diarrhea that resolves within days, children often develop complications including fever and diarrhea.
Boiling for 8 minutes is optimal
Although eggs may be contaminated with Salmonella, preventing infection is straightforward—first, thoroughly rinse the eggshells under clean water before cooking.Since eggshells can easily carry chicken droppings, processing them—especially when preparing eggs partially cooked—risks contamination from salmonella in the droppings, making them a potential source of salmonellosis.
Should eggs be placed in cold or hot water?
Second, ensure they are thoroughly cooked. Eggs must be heated until both the yolk and white are completely set to guarantee safety.Overcooking or undercooking is problematic. The optimal method is: After washing the eggs, place them in a pot of water and soak for one minute. Bring to a boil over low heat. Once boiling, reduce to a gentle simmer and cook for 8 minutes.Avoid overcooking, as prolonged heating causes ferrous ions in the yolk to react with sulfur ions, forming brown ferrous sulfide deposits that hinder iron absorption.However, this practice is problematic. After heating, the eggshell membrane—which normally blocks bacteria—is damaged. This leaves the eggshell's pores vulnerable, allowing bacteria to freely enter the egg.
The correct method is to add a small amount of salt during boiling. Salt not only kills bacteria and neutralizes toxins but also creates a slight gap between the shell membrane and the egg white membrane due to differing contraction rates, making the shell easier to peel.
What's the most nutritious way to cook fried eggs, scrambled eggs, or boiled eggs?
For adults, boiling eggs is the optimal cooking method. However, avoid overcooking—boil for 5–7 minutes in boiling water. Remember to chew thoroughly, as improper chewing can hinder absorption and digestion. For children, steamed egg custard or egg drop soup is most suitable, as these methods break down proteins into easily digestible forms.(In terms of nutrient absorption and digestibility rates: boiled eggs are 100%, scrambled eggs are 97%, lightly fried eggs are 98%, well-fried eggs are 81.1%, eggs mixed with boiling water or milk are 92.5%, and raw eggs are 30%–50%).
Overcooking fried eggs causes the edges to char, converting the egg white's high-molecular-weight proteins into low-molecular-weight amino acids. These amino acids can form toxic chemicals at high temperatures. Additionally, limit consumption of tea-flavored eggs, as the acidifying substances in tea combine with iron in eggs to irritate the stomach and impair digestive function.
Three Common Misconceptions About Egg Consumption
Misconception 1: More Eggs Are Better for Postpartum Women
Childbirth depletes a woman's physical strength, weakens digestive absorption, and reduces liver detoxification capacity. Excessive egg consumption burdens the liver and kidneys, leading to adverse effects.Excessive protein intake also generates large amounts of ammonia, hydroxyl, phenol, and other toxic chemicals in the intestines. This can cause abdominal distension, dizziness, limb weakness, and even coma, leading to "protein poisoning syndrome." Protein intake should be calculated based on the body's digestive and absorption capacity. Generally, about 3 eggs per day is sufficient for new mothers.
Misconception 2: Regular egg consumption raises cholesterol levels
This is not true. Egg yolks contain abundant lecithin, a potent emulsifier that breaks down cholesterol and fat particles into extremely fine particles. These particles can then pass smoothly through blood vessel walls and be fully utilized by cells, thereby reducing cholesterol levels in the blood.Moreover, after digestion, the lecithin in egg yolks releases choline, which enters the bloodstream and synthesizes acetylcholine—a primary neurotransmitter that enhances brain function and memory.
Misconception 3: Raw eggs are more nutritious.
Consuming raw eggs is not only unhygienic and prone to bacterial contamination but also nutritionally deficient.Raw eggs contain avidin, which inhibits the absorption of biotin from food, leading to symptoms like loss of appetite, generalized weakness, and muscle pain—known as biotin deficiency. Additionally, raw eggs contain trypsin inhibitors that disrupt digestive function. As for "feathered eggs" (eggs incubated but not hatched), they are even less hygienic.
Beware of Artificial Eggs
For the Chinese, who hold food as paramount, never before has eating been so fraught with fear!
We learned about paraffin wax from toxic rice; about dichlorvos from contaminated ham; about Sudan Red from red-yolk duck eggs and chili sauce; about formaldehyde from hotpot;From toxic silver ear mushrooms and honey dates, we learned about sulfur; from toxic wood ear mushrooms, copper sulfate; from toxic milk powder, melamine; and now, the exposure of "artificial eggs" has introduced us to sodium alginate, alum, and gelatin.
We've practically completed our chemistry education through one food safety crisis after another.
Through journalists' undercover investigations into the minutiae of "artificial egg" training centers, we see not only the counterfeiters' skilled and routine craftsmanship, but also how readily available these chemical ingredients are. We witness not only their brazen nonchalance, but also the thriving business of counterfeit training.
With the emergence of "artificial eggs," people inevitably ponder and question: How did sodium alginate, alum, and gelatin in these eggs, melamine in milk, clenbuterol and antibiotics in lean meat, aflatoxin (a Class 1 carcinogen) in toxic rice, and benzoyl peroxide and potassium bromate in contaminated flour—all these substances—come to be? If not developed by technicians and introduced to the market, how would vendors even know to use them?and potassium bromate in contaminated flour—how could merchants have known about and applied these substances if not for technicians developing and marketing them? In fact, reviewing the handling of recent food safety incidents reveals a consistent failure to trace root causes to technological inventions and innovation sources, nor to address oversight in chemical raw material management. Technicians' complicity in enabling wrongdoing has been deliberately or inadvertently overlooked and concealed.
Each food safety incident reignites public demand for safe food.When the principle that "science and technology are the primary productive forces" is hijacked by distorted greed, when scientific achievements are greedily transformed into "artificial eggs" that can be easily synthesized from a pile of chemical raw materials to be "indistinguishable from the real thing," the essence of man-made disaster is not far off.