It's normal for liquid to separate from yogurt over time—and doesn't mean it's spoiled. The thin, watery layer sitting on top of yogurt is not a sign of spoilage. It's whey protein, which offers ...

Every morning, many people throw away that liquid that appears when they open a yogurt, thinking it is just "water". But it's not. It's called whey and it's loaded with protein, minerals and vitamins.