Casein - Properties, Application, Contraindications
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Milk and dairy products are a crucial component in the diet of a healthy person. According to the principles of healthy nutrition, an adult should consume 2 glasses of milk daily, one of which can be substituted with fermented dairy beverages, such as kefir, yogurt, and cheese. Nowadays, an increasing number of people are avoiding milk and dairy due to lactose intolerance - the sugar found in milk. Simultaneously, protein supplements, including casein, the cow's milk protein, are becoming increasingly popular. Why is it worth considering their use?
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Casein - understanding the essence of this substance
Casein is one of the two main types of proteins that occur in milk. Together with whey protein, it makes up about 80% of all the proteins present in cow's milk. Milk contains an average of about 3.4% protein. For example, a glass (240 ml) of milk provides about 10 g of protein, of which casein makes up about 8 g. Casein is divided into five main types: alpha-casein, beta-casein, gamma-casein, delta-casein, and kappa-casein. It is a high-quality protein that contains all the essential amino acids.
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Characteristics of Casein
Casein, as a source of calcium and phosphorus, plays a crucial role in the proper functioning of the body. Calcium is essential for maintaining the health of bones and teeth, while phosphorus is necessary for proper absorption of calcium. Together with calcium, casein influences the process of bone mineralization and has a significant impact on energy metabolism. Specifically, gamma-casein displays immunomodulatory and anti-inflammatory properties, while kappa-casein prevents the adhesion of Helicobacter pylori bacteria to the gastric mucosa, preventing the development of gastric ulcers. Casein also serves as a carrier of calcium and other micronutrients, thereby maintaining a feeling of satiety and regulating food intake throughout the day. It also increases energy expenditure through the enhancement of thermogenesis in the body. Finally, as a high-quality protein, casein supports muscle synthesis, which can contribute to fat loss and the maintenance or increase of lean body mass.
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Casein and decreasing body mass
Investigations demonstrate that individuals with mild overweight who follow a high-protein diet, including casein or serum, effectively decrease their surplus adipose tissue. Casein influences the sensation of satiety, which contributes to body weight reduction. Dr. Heather J. Leidy, PhD, Assistant Professor in the Department of Exercise Physiology and Nutrition at the University of Missouri, confirms that casein enhances satiety because ingesting a protein-rich meal inhibits the activity of the brain areas responsible for appetite.
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Casein for the Night
Casein is slowly metabolized in the body. It does not dissolve in the acidic environment that exists in the stomach. It has coagulation properties, which result in the formation of an insoluble mass that is slowly absorbed, which can last up to 8 hours. Due to its slow absorption in the digestive tract, it is recommended for individuals who consume fewer meals over longer periods of time. It eliminates the need to eat between meals. Particularly recommended for the night, as it provides slowly released amino acids during the long gap between dinner and breakfast. It supports muscle protein synthesis throughout the night. Furthermore, studies on rats have shown that alpha-casein has a calming and relaxing effect on sleep, positively impacting sleep quality.
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Application of Casein
The sufficient intake of protein ensures the maintenance of nitrogen balance in the body. Inadequate protein consumption can result in muscle wasting. There is an increasing demand for protein supplements, including casein protein (micellar casein or calcium caseinate). Casein is utilized for the purpose of: reducing fat tissue while minimizing the loss of lean body mass, building muscle mass, and enhancing physical performance. The application of casein supplements is particularly prevalent among physically active individuals, including athletes, although it is sometimes utilized by individuals aiming to lose weight.
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Milk protein casein and its potential harmful consequences
There's a theory that casein, a milk protein, might have carcinogenic properties, which is not confirmed. However, casein can hinder the iron absorption process, which could lead to deficiencies of this essential nutrient.
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Casein and Oversensitivity
A considerable number of individuals shun the consumption of milk and dairy products as they encounter undesirable digestive symptoms following their ingestion. The blame is generally placed on lactose, the sugar present in milk. Nonetheless, this is not always the cause. Often, the genuine culprit is an allergy to casein. Casein can induce abdominal pain and other adverse digestive symptoms.
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Recommendations for the Administration of Casein
Manufacturers of casein protein supplements advise consuming 90 grams of casein protein daily in three portions, equivalent to 30 grams per portion. The portion should be dissolved in milk or water. On training days, it is recommended to consume the first portion immediately upon waking in the morning, the second portion 1.5 hours after training, and the last portion just before bedtime. On non-training days, it is recommended to consume the first portion in the morning upon waking, the second portion between meals, and the last portion before bedtime.
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Casein - A Question of Contraindications
Casein should not be used by individuals with an allergy to cow's milk protein and pregnant women. Breastfeeding women should consult their doctor before using casein.
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Summary
Protein constitutes a significant component that is indispensable for perpetual growth and maintenance of muscle mass. Not merely professional athletes, but also physically active individuals should pay attention to the appropriate consumption level of this macronutrient in their diets. It is essential to opt for high-quality proteins that encompass exogenous amino acids, such as casein, as it exerts a positive influence on fat reduction while preserving muscle mass. It presents a beneficial solution not only for professional athletes, but also for amateur athletes.
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Scientifically reviewed by a clinical dietitian
• 15.03.2026
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