What key sugar or protein component must dairy products contain, which eggs lack?

Answer

Lactose or milk proteins

Dairy products are defined by originating from mammal milk, and consequently, they contain lactose, which is the primary sugar found in milk, or they contain milk proteins like casein. Eggs, conversely, originate from birds and are nutritionally distinct, containing virtually no lactose or milk protein. The presence of lactose is significant because a large portion of the adult global population loses the ability to digest it, leading to intolerance symptoms when milk components are consumed, making this distinction critical for dietary management.

What key sugar or protein component must dairy products contain, which eggs lack?
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