Whey
A yellowish-green, protein-rich liquid left over after milk is curdled during cheesemaking. Has uses ranging from making ricotta-style cheese to protein powder.
What Is Whey?
Whey is the yellowish-greenish liquid left over after milk is curdled with rennet or acid and the solid cheese portion (curd) is separated. Part of the milk protein, most of the lactose, and minerals remain in this liquid.
Although it was long seen only as a byproduct/waste, its nutritional value has now been recognized, and it has gained industrial importance especially as the raw material for commercial "whey protein" powders.
Nutritional Values of Whey
100 ml of whey contains around 25 kcal of energy; it carries high biological value protein (whey protein) and lactose. Values are approximate.
How Should Whey Be Consumed?
Whey can be considered part of a balanced diet as a protein source; it can be drunk directly or used as a liquid component in cooking.
This information is general; whey is a food, not a substitute for medical treatment. People with lactose intolerance are advised to consume it carefully.
How to Choose Whey?
If homemade, it should be clear, yellowish-greenish in color, and have a mildly sour-fresh smell. Cloudy whey, whey with a spoiled smell, or whey that has turned gray should not be used.
- Color should be clear yellowish-greenish
- Smell should be mildly sour-fresh
- No cloudiness or spoiled smell
How to Store Whey?
Whey can be stored in the refrigerator in a closed container for 4-5 days; it can be frozen for longer storage.
Using Whey in the Kitchen
Whey is most often used to make ricotta/lor cheese (reheating a second time to collect the remaining proteins), as a substitute for water in bread dough, and as a liquid component in smoothies and soups.
How Is Ricotta Made from Whey?
When whey is reheated with a small amount of vinegar or lemon juice added, the proteins remaining in it curdle a second time; this curd is strained to obtain a ricotta/lor-like cheese.
Frequently Asked Questions
Are whey protein powder and homemade whey the same?
They come from the same source, but commercial whey protein powder is produced by drying and concentrating the liquid; homemade whey is watery and unprocessed.
Should whey be discarded or used?
Since it is a valuable protein-mineral source, it is recommended to use it in bread dough, soup, or ricotta making rather than discarding it.
Is whey similar to ayran?
Although both appear watery-light, they are different products; ayran is made from yogurt while whey is obtained from cheesemaking, and their taste and nutritional profiles differ.