how many calories is in one egg
You might be looking at different units. 1 large egg contains 78 calories (per egg) of which 55 are in the yolk. But 100 grams of egg yolk contains 322 calories. As to eggs and health - certainly egg yolks contain nearly all the fat in an egg. However, that does not mean you should not eat whole eggs. First, 78 calories is not that much.