What happens to egg yolks after separating?

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When companies that sell egg whites separate egg yolks from the egg whites, what do they do with the yolks? They also sell the yolks separately. We buy them for the restaurant all the time. They are much more expensive than the whites..
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When firm peaks form, the egg white has reached its fullest volume and should not be beaten any longer. Over-Beaten Egg Whites: If egg whites are beaten past the point of stiff peaks, the matrix of proteins will begin to break down and the foam will collapse. The egg whites will become grainy, watery, and flat.
Eat whole eggs in moderation. If you really enjoy eggs, consider switching to recipes that use only egg whites more often. You can always substitute two egg whites for one whole egg in recipes. They're packed with protein and are just missing the fat and cholesterol.
Egg, white only, raw weigh(s) 257 grams per metric cup or 8.6 ounces per US cup, and contain(s) 52 calories per 100 grams (≈3.53 ounces) [ weight to volume | volume to weight | price | density ] Egg, white, raw, frozen, pasteurized contain(s) 48.3 calories per 100 grams (≈3.53 ounces) [ price ].
However, there has been a constant debate on how eggs also contribute to increased cholesterol level that is generally found in the egg yolk, which is why most people opt for only egg whites. Eating only egg whites instead of whole may lower the amount of calories, fat and saturated fats you consume.
CortlandThe Cortland is a relatively soft apple, although not quite as soft as the McIntosh. And unlike the McIntosh, the Cortland functions as an all-purpose apple, which means you can bake it, cook it, or eat it raw. This is the most popular apple variety in the U.S. It's top heavy and has a creamy white interior.