Egg Fun Facts

The protein avidin in raw egg whites binds to biotin (vitamin B7) and can cause biotin deficiency if consumed in large quantities over time. Cooking denatures avidin, solving the problem.

Source: American Journal of Clinical Nutrition

The world consumes approximately 2.3 trillion eggs per year. That's roughly 290 eggs per person on the planet annually.

Source: International Egg Commission, 2022

The air cell in an egg (the flat end) grows as the egg ages. USDA Grade AA eggs have an air cell less than 3.2mm (1/8 inch) deep.

Source: USDA Egg Grading Manual

Egg yolk color ranges from pale yellow to deep orange depending on the hen's diet. Hens eating marigold petals, red peppers, or corn produce darker yolks. Color doesn't indicate nutrition.

Source: Poultry Science Association

Fertile eggs sold in stores will not develop into chicks without incubation at the correct temperature (37.5°C / 99.5°F) and humidity for 21 days.

Source: University of Illinois Extension — Incubation and Embryology

The word 'oeuf' (French for egg) gave us the culinary term 'eggs en cocotte,' but the tennis term 'love' (meaning zero) also likely derives from 'l'oeuf' — because zero looks like an egg.

Source: Oxford English Dictionary (disputed etymology)

Eggs can be preserved for months using water glassing — submerging unwashed eggs in a solution of pickling lime (calcium hydroxide) and water. The technique dates back centuries.

Source: University of Alaska Fairbanks Cooperative Extension

Duck eggs have a higher fat content than chicken eggs (9.6g vs 5g per egg) and produce richer, more tender baked goods. Many professional bakers prefer them.

Source: USDA FoodData Central

In China, red-dyed eggs are given to celebrate a baby's one-month birthday. The color red symbolizes happiness and good fortune.

Source: Encyclopedia of China (Berkshire Publishing)

In many Latin American countries, eggs are stored at room temperature in grocery stores. Unwashed eggs retain a protective cuticle that keeps bacteria out — no refrigeration needed.

Source: FDA Food Safety Modernization Act; EU Egg Marketing Standards

Chickens were domesticated from wild red junglefowl in Southeast Asia around 8,000 years ago, but initially for cockfighting — not for eggs.

Source: PNAS, 2020 — 'The biocultural origins of domestic chickens'