An egg yolk is the part of a fertilized egg that supports the developing embryo. It has a very different nutritional content from the white of an egg. It contains all of the fat and cholesterol in the egg, whereas the white is almost all protein. Most of the vitamins and mineral in the egg are concentrated in the yolk.
Serving Information
NutritionData provides calorie information for fresh, raw egg yolks. The serving size for this information is 1 yolk weighing 17g, or about 0.6 oz. This yolk comes from a large chicken egg.
Calories
An egg yolk has a total of 54 calories. This provides 3 percent of the daily value (DV) for calories, assuming a standard diet of 2,000 calories per day. Fat contributes 41 calories, protein provides 11 calories and carbohydrates account for the remaining two calories.
Fat
An egg yolk has a total of 4.5g fat, which provides 7 percent of the DV for fat calories. Saturated fat makes up 1.6g of this total, which is 8 percent of the DV for calories from saturated fat. An egg yolk also contains 210mg cholesterol, or 70 percent of the DV for cholesterol.
Carbohydrates and Protein
An egg yolk contains 0.6g carbohydrates, which provides less than 1 percent of the DV for calories from carbohydrates. This total includes 0.1g simple sugar but no dietary fiber. A serving of egg yolks also contains 2.7g protein, which is 5 percent of the DV for protein calories.
Vitamins and Minerals
An egg yolk contains 14 percent of the DV for selenium and 7 percent of the DV for phosphorus. Additional nutrients in egg yolk include 6 percent of the DV for vitamin B12 and folate. An egg yolk also has 5 percent of the DV for vitamin A, vitamin D, riboflavin and pantothenic acid.
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