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In the EU, weight ranges are used for hens' eggs (weighed with shell which is about 10% of the total): very large eggs 73 g or over, large 63–73 g, medium 53–63 g, and small 53 g or less. In the USA average weights are used: jumbo 70.0 g, extra large 63.8 g, large 56.7 g, medium 49.6 g, small 42.5 g, and peewee 35.4 g. Ducks' eggs weigh about 85 g.

An average portion of two eggs is a rich source of vitamins D and B12; a good source of protein, niacin, and vitamins A and B2; a source of zinc; contains 170 mg of sodium; 13 g of fat, of which 35% is saturated and 50% mono-unsaturated; supplies 175 kcal (735 kJ). The egg-white is 60% of the whole and the yolk 30%.

Subjects: Medicine and Health.

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