Harvard Heart Letter

Ask the doctor: Is an egg a day okay?

Q. Can eggs be part of a balanced, heart-healthy diet?

A. Eggs are handy, inexpensive sources of protein. They also contain healthful fats, folic acid, and essential vitamins.

Heart-wise, although a single egg yolk contains about 200 milligrams of cholesterol — two-thirds of the daily recommended intake — for most people, cholesterol in food has little effect on cholesterol in the bloodstream. Blood-borne cholesterol is a major contributor to artery-clogging plaque, but most of that originates in the liver.

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