Whey or milk plasma is the liquid remaining after milk has been curdled and strained. It is a by-product of the manufacture of cheese or casein and has several commercial uses. Sweet whey is manufactured during the making of rennet types of hard cheese like Cheddar or Swiss. Acid whey (also known as "sour whey") is obtained during the making of acid types of cheese such as cottage cheese.
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Whey is used to produce ricotta, brown cheeses, Messmr/Prim and many other products for human consumption. It is also an additive in many processed foods, including breads, crackers and commercial pastry, and in animal feed. Whey proteins primarily consis