Why Do Americans Refrigerate Their Eggs? The Surprising Science Behind It

 🧼 1. Eggs are Washed and Sanitized

American Store Egg in Refrigerator 

• In the U.S., eggs are washed with soap and water to remove bacteria like salmonella from the shell.

• While this removes dirt, it also washes away the natural protective layer called the cuticle (or bloom).

• Without this layer, eggs are more susceptible to bacteria and moisture loss, so refrigeration is required to keep them safe and fresh.

🧫 2. FDA Regulations

• The U.S. Food and Drug Administration (FDA) requires refrigeration of eggs at below 45°F (7°C) after processing to reduce the risk of Salmonella contamination.

• It's part of strict hygiene and food safety rules.

🌍 Why Not in Other Countries?

• In countries like many parts of Europe, eggs are not washed the same way.

• The cuticle remains intact, and eggs can be safely kept at room temperature.

• Also, European farms often vaccinate hens against salmonella.

✅ Summary:

• U.S. eggs must be refrigerated because washing removes their protective layer.

• Other countries don’t wash eggs the same way, so room-temperature storage is safe.