Egg Whites

• The egg white contains half of the protein found in the entire egg, according to the Egg Nutrition Center.
  
  

Egg Yolks

• Egg yolks belong to a select group of foods that contain natural Vitamin D.
  
  

Allergies

• Egg allergies are triggered by an immune-system reaction to the protein in the egg. The Mayo Clinic reports that both white and yolk have protein content, but the allergic reaction is more common in consumption of egg whites.
  
  

Cholesterol

• An egg has an average of 213 mg. of cholesterol, according to the Mayo Clinic, and all of it is found in the egg yolk.
  
  

Dietary Recommendations

• The National Institutes of Health recommends diets that limit egg-yolk consumption to three or four per week, including yolks used as ingredients in other foods.
  
  

Fun Fact

• The diet fed to hens determines the color of the egg yolk. Alfalfa and yellow corn create the darkest yellow color, while diets of barley and wheat produce paler yellow color yolks.