"The white of a large egg, or about 1-1/4 ounces, has 16 calories, 3 g of protein, 2 mg of calcium, 4 mg of phosphorus, 55 mg of sodium, 45 mg of potassium, the weensiest little bit of riboflavin, and no fat, cholesterol, or carbohydrates.
The yolk of that egg weighs about 2/3 of an ounce, and has 59 calories, 3 g of protein, 5 g of fat (2 of which are saturated), 212 mg of cholesterol, 23 mg of calcium, 81 mg of phosphorus, 7 mg of sodium, 16 mg of potassium, very small amounts of iron, thiamin, and riboflavin, and no carbohydrates" from:
http://www.ochef.com/950.htm
My take on it is that a yolk is more nutritious as well as contains less allergens. That's why yolk is approved as being one of a baby's first foods. However, the yolk also has cholesterol.
**Now the debate starts with... Are farm fresh eggs from chickens that have access to free range more healthy for you? I've read that they have less 'bad' cholesterol and have more good cholesterol as well as having more Omega 3's and such...
I JUST EAT THE WHOLE EGG! Preferably over easy with a biscuit to sop up the yolk. Yummmmmm!