Soft-Boiled Eggs: Delicious but Beware of Bacterial Infection Risks

Soft-Boiled Eggs: Delicious but Beware of Bacterial Infection Risks

Soft-boiled eggs are a popular favorite thanks to their rich, velvety texture. However, eating undercooked eggs can increase the risk of bacterial contamination and affect the absorption of certain nutrients.

Below is essential information about the nutritional value, health risks, and groups of people who should think twice before eating soft-boiled eggs.

1. What is the nutritional value of soft-boiled eggs?

Essentially, both soft-boiled and fully cooked eggs provide protein, fat, vitamins, and minerals such as vitamins A, D, B12, choline, iron, zinc, etc.

The degree of processing can affect certain nutritional components. Prolonged exposure to high heat may partially degrade heat-sensitive compounds, including lutein and zeaxanthin—antioxidants that benefit eye health.

However, fully cooked eggs have an advantage in terms of protein digestibility and absorption. Several studies show that the body absorbs protein from cooked eggs significantly better than from raw or undercooked eggs.

According to MSc. Dr. Dang Ngoc Hung, Director of the Nutrition Research and Consulting Institute (NRECI), cooking methods significantly affect the absorption of protein in eggs. Well-cooked eggs help the body absorb protein better than raw or soft-boiled eggs. In addition, the protein in raw egg whites can reduce biotin (vitamin B7) absorption if consumed regularly.

2. Undercooked eggs carry a risk of bacterial infection

The most notable risk when eating raw or undercooked eggs is Salmonella infection. This bacteria can be present on the eggshell or inside the egg. Therefore, even eggs that look clean and intact cannot be completely guaranteed free from bacterial contamination.

People infected with Salmonella may experience symptoms such as diarrhea, abdominal pain, fever, nausea, vomiting, headache, or dehydration. In some cases, the infection can become severe, particularly in high-risk groups.

According to the U.S. Food and Drug Administration (FDA), individuals at higher risk of severe illness from Salmonella include young children, the elderly, pregnant women, and people with weakened immune systems. The FDA recommends cooking eggs until both the yolk and white are firm to reduce the risk of foodborne illness.

3. Who Should Limit Eating Soft-Boiled Eggs?

Pregnant women: This group should be particularly cautious with raw or undercooked eggs due to the higher risk of foodborne illness. The FDA advises pregnant women to avoid foods containing raw or only partially cooked eggs, unless pasteurized eggs are used.

Young children and the elderly: The immune system in young children is not fully developed, while older adults may have a reduced ability to fight infections. Therefore, these two groups should prioritize fully cooked eggs.

People with weakened immune systems: Those undergoing cancer treatment, organ transplants, or taking immunosuppressive drugs may face a higher risk of severe complications when infected with Salmonella.

4. How to safely select and prepare eggs

Choose eggs of clear origin that are refrigerated, clean-shelled, and not cracked. The FDA recommends storing eggs in the refrigerator at 4°C or below.

When cooking, the safest method is to cook until both the egg white and yolk are firm. For dishes that use raw or undercooked eggs, pasteurized eggs should be preferred to reduce the risk of Salmonella infection.

Cooked eggs should be consumed promptly and not left at room temperature for an extended period. Perishable foods must be refrigerated promptly to curb bacterial growth.

Note: Soft-boiled eggs may be suitable for some healthy adults, but they are not the safest choice for everyone. When food safety is a priority, opt for fully cooked eggs.