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How to make a healthy omelet 
Consider the nutritional value of egg yolks. 
Though whole eggs contain a bit more protein than egg whites, their relative value comes from nutrients and vitamins that are plentiful in the egg yolk. For instance, even a small raw egg contains meaningful amounts of iron, phosphorus, zinc, and folate.
Further, yolks also contain good vitamins a and d, as well as a bunch of choline, lutein, and zeaxanthin, all of which your body needs. Substitute egg whites to limit cholesterol.