It’s whey liquid milk fraction formed during coagulation of casein proteins. When the milk curdles under the influence of rennet or bacterial fermentation, a firm curd is separated – the future cheese – and a light, slightly cloudy liquid with a subtly sweet aroma. Depending on the technological process, it is obtained rennet wheyą, characteristic of ripening cheeses, and sourtypical for cottage cheese. Both varieties differ in composition, taste and use, but they have one thing in common: they have been an important element of the European dairy tradition for centuries.
In Alpine farms it was drunk in the summer and treated as a natural way to strengthen the body after hard work. In the 19th century, in Switzerland and Austria, there were even special guesthouses offering “whey treatments” lasting several weeks, during which guests consumed large amounts of it, believing in its regenerating effects. In Polish rural cuisine, whey had equally practical uses: it was added to bread leaven, used as a base for żurek soup, and as a natural preservative for pickles. Its presence in the kitchen was so obvious that it was treated as a first-need product.
However, modern technology has changed its status. The development of ultrafiltration, microfiltration and ion exchange allowed the isolation of high-purity protein fractions from whey – WPC concentrates, WPI isolates and WPH hydrolysates. These advanced forms of protein are the basis of the supplement industry and an important ingredient in functional foods, medical products and cosmetics. Back in the 1980s, some plants poured whey into the sewage, but today 100% of it is used. down protein production, lactose, fermented drinksand even bioethanol.
It is worth remembering that liquid whey and powdered whey are two different products. Natural, fresh whey retains its full properties because it does not undergo a drying process. The powder is convenient and durable, but some proteins are denatured by temperature. Therefore, producers are increasingly using gentler drying methods to retain as much nutritional value as possible.
Whey has an exceptionally rich protein profile. Contained in it alpha-lactalbumin delivers tryptophan influencing mood regulation, a beta‑lactoglobulina is a carrier of fat-soluble vitamins. High content leucinean amino acid that initiates the process of muscle protein synthesis, makes whey one of the most effective natural post-training regeneration stimulators. This is confirmed by a 2025 scientific review published in “Natural Product Communications”, analyzing the chemical properties of whey proteins and their impact on muscle growth in athletes.
The health-promoting properties of whey also include immune-supporting properties. Laktoferynaone of the most valuable whey proteins, binds iron, limiting the growth of microorganisms, and at the same time supporting the body’s natural defense mechanisms. Immunoglobulins present in whey additionally strengthen the body’s response to seasonal infections. Acid whey also has a high content milk phospholipidsincl sphingomyelinwhich supports the functioning of neurons and helps maintain the proper functioning of the intestinal barrier. Phospholipids are responsible for improving communication between nerve cells, so they can support concentration and memory.
Whey also affects the electrolyte balance. Delivers calcium, potassium, phosphorus and magnesiumthus supporting the proper functioning of muscles and the nervous system. Present in her B vitamins participate in energy transformations, a vitamins A and C they promote tissue regeneration and protect cells against oxidative stress. Regular consumption of whey improves digestive comfort, especially the acidic whey it contains lactic acid bacteria acting as a natural probiotic. Whey can therefore be a valuable element of the diet of people who care for their intestines, especially during periods of increased stress or after antibiotic therapy.
More and more research also indicates the beneficial effect of whey proteins on carbohydrate metabolism. Consuming whey before or during a meal may reduce postprandial increases in blood glucose and improve insulin response. This mechanism is associated with increased secretion of intestinal incretins, including GLP-1, which regulate sugar levels and appetite. For this reason, whey is often included in the diet of people with insulin resistance and metabolic syndrome.
Whey proteins they support the feeling of satiety and help control body weightand bioactive peptides can influence the elasticity of blood vessels, lowering cholesterol and blood pressure. Athletes use whey as a quick source of amino acids after training, and people on a vegetarian diet treat it as a valuable supplement to animal protein. In some regions In Europe, whey is drunk in the morning instead of coffee as a natural way to stimulate the metabolism and hydrate the body. Its easy digestibility makes it easy to include in the daily diet, even for those who have a sensitive digestive system.
Whey supports weight loss through several mechanisms. Whey protein increases the secretion of satiety hormones GLP‑1 i HAZEL HENso it helps reduce appetite and reduces the urge to snack. At the same time, high content leucine supports the maintenance of muscle mass during a calorie deficit. Muscle uses more energy than fat tissue, so preserving them helps keep your metabolism active even when you eat less.
The effectiveness of whey in the weight loss process is confirmed meta-analysis of clinical trials from 2024published in the magazine Nutrients. The authors showed that people supplementing whey protein lost more body fat while maintaining lean body mass. The best effects were observed with ingestion 20-30 g of whey protein per servingwhich corresponds to a standard dose of concentrate or isolate.
Natural liquid whey contains less protein than powder, but still gives a feeling of satiety with a very low calorie content. A glass of fresh whey is approximately 60-70 kcalwhich is less than most drinking yogurts. This makes it great as a light drink between meals that helps control hunger without burdening the stomach.
Whey tastes best chilled, served in its simplest form – slightly sour, refreshing, with a few drops of lemon juice. This drink quenches your thirst faster than most ready-made dairy products, and at the same time provides natural electrolytes and easily digestible protein. In many Alpine farms, it is still drunk in the morning as a gentle way to stimulate the metabolism. Its delicate structure makes it combine well with fruit, especially raspberries, strawberries and banana. A morning whey-based smoothie provides tryptophan, which supports serotonin production. It’s a natural way to feel better and have a calmer start to the day.
Sour whey, rich in lactic acid, is perfect as base for żurek soup, cold soups and marinades. Lactic acid naturally softens muscle fibers, making the meat juicier and more aromatic. It has been added in rural baking for generations for bread doughbecause it improves the elasticity of gluten, makes the crust crispy and prolongs the freshness of baked goods. In Central European cuisines, whey was also traditional an addition to pickles: cucumbers and cabbage fermented with it gained a more intense flavor and a higher content of natural probiotics.
Whey may appear in the daily menu in the form of cocktails, soups, pancakes and homemade sauces. An example of a drink that combines taste and nutritional value is a mix: 250 ml of whey, a handful of raspberries, half a banana and a tablespoon of linseed. This cocktail provides protein, fiber and antioxidants, while remaining light. In the savory version whey is a great substitute for broth in cream soupsespecially in combination with carrots, pumpkin or sweet potatoes. Its natural acidity highlights the flavor of vegetables and gives dishes freshness. It is also worth remembering its cosmetic applications: whey rinse smoothes hair, and whey protein tonic improves skin elasticity.
The frequency of consumption depends on individual tolerance, but it is most often recommended one glass a day. Physically active people can drink it after training to replenish fluids and provide quickly absorbable amino acids. Natural whey contains small amounts of lactosetherefore people with intolerance should monitor the body’s reaction or choose whey protein isolates with reduced milk sugar content. Allergy to milk proteins excludes its use.
Sources: Terazgotuje.pl, ResearchGate, journals.sagepub.com
