One whole egg generally has about 66 calories. It also includes about 4 grams of fat, 197 milligrams of cholesterol, 58 milligrams of sodium and 6 grams of protein.
Eggs have a high cholesterol content, and high blood cholesterol levels are associated with heart disease. However, saturated fat has a much more significant effect on cholesterol levels than the cholesterol in food. Of the 4 grams of fat found in an egg, only 1.2 grams are saturated fat.
Eggs are high in vitamins and minerals, including iron, phosphorous, selenium, vitamin B-6 and vitamin B-12. They also have lutein and zeaxanthin, two nutrients that fight disease.
For full health benefits, eggs must be stored in the refrigerator and then completely cooked to kill bacteria.