If you want to use the following original source information from Harold McGee’s On Food and Cooking, page 15:
Milk has been especially valued for two nutritional characteristics: its richness in calcium and both the quantity and quality of its protein. Recent research has raised some fascinating questions about each of these.
Use a Quotation
To quote it directly:
“Milk has been especially valued for two nutritional characteristics: its richness in calcium and both the quantity and quality of its protein. Recent research has raised some fascinating questions about each of these" (McGee 15).