The lowdown: Soy milk’s base is an extraction from mature soy beans; it’s typically mixed with water and some type of natural sweetener. Soy milk is naturally low in saturated fat and cholesterol-free. Slightly thicker than cow’s milk, it’s safe for people who have dairy allergies or who are lactose-intolerant.
Good to know: Because soy milk is plant-based, it doesn’t have as much protein as cow’s milk. Flavored soy milk contains less protein than unflavored, since the flavoring reduces the protein content per ounce.