Available as powdered drinks, snack bars, puddings, and specialized breads, protein-enriched products are marketed as convenient dietary sources. Brands like Kindershake and Teen Balance specifically target youth, and their marketing strategy appears to be highly effective.
A 2024 survey by the University of Michigan, which polled nearly 1,000 parents, revealed that just under half of adolescents aged 13 to 17 had consumed protein products in the preceding year. The study highlighted a gender gap: boys were more inclined to use these products for sports and muscle building, while girls tended to consume them to balance their diets and support weight management.
According to Statista, the fitness protein market in Germany experienced a massive surge of approximately 25% in retail revenue between March 2024 and March 2025, reflecting a broader global trend.
Understanding Daily Protein Requirements
Proteins are fundamental building blocks of the human body, essential for cellular growth, tissue repair, and overall metabolic function. They are crucial for constructing and maintaining muscles, skin, and organs, and serve as the foundation for enzymes that regulate vital chemical reactions and antibodies that protect the immune system.
The German Nutrition Society (DGE) recommends that healthy adults consume 0.8 grams of protein per kilogram of body weight daily. For instance, a woman weighing 65 kilograms would need to intake approximately 52 grams of protein each day.
These requirements can easily be met through a balanced diet without the need for specialized supplements. For example, a breakfast of oat flakes with almond milk, a baked potato with curd cheese for lunch, and two slices of wholemeal bread with peanut butter in the evening easily cover daily needs.
Because adolescents are still growing, they require slightly higher amounts: 0.9 grams per kilogram of body weight. A teenager weighing 45 kilograms should therefore consume about 40.5 grams of protein daily. Similarly, children aged one to four and individuals over 65 are advised to consume up to one gram of protein per kilogram of body weight.
While older adults often consume insufficient protein due to reduced appetite, research indicates that younger populations frequently overshoot the mark. A German study conducted between 2015 and 2017 found that roughly half of children and adolescents aged six to 17 consumed more than double their recommended daily protein intake.
The Health Risks of Excessive Protein Intake
According to the DGE, long-term overconsumption of protein can be detrimental to health. Studies indicate that high intake, particularly of animal protein, is associated with an increased risk of childhood obesity and early onset of puberty in some cases.
Most critically, excessive protein intake places immense strain on the kidneys, which must process amino acids into urea for excretion. This strain can lead to kidney damage, especially in individuals with pre-existing conditions, those who do not hydrate adequately, and even healthy adolescents.
The Role of Protein in Muscle Building and Weight Management
Physical activity significantly elevates protein needs. According to a DGE position paper, adequate protein intake is vital for maintaining and building muscular mass and strength, as well as facilitating recovery after physical exertion.
The paper suggests that athletes and highly active individuals should consume between 1.2 and 2 grams of protein per kilogram of body weight daily, distributed across multiple meals. It is important to note that these elevated guidelines specifically apply to those training for more than five hours daily.
Protein is highly satiating, making it a valuable nutrient for weight management. Diets rich in protein generally support weight loss efforts more effectively than other dietary approaches. However, long-term weight management ultimately depends on the fundamental balance of caloric intake versus expenditure.
Comparing Animal and Plant-Based Proteins
Overall, plant proteins typically contain slightly fewer essential amino acids compared to animal-derived proteins. These “essential” amino acids cannot be synthesized by the body and must be obtained through diet.
Vegetarian protein for muscle building
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Nevertheless, whole grains, legumes, and nuts are rich in fiber, vitamins, and healthy unsaturated fats. Consequently, the DGE recommends prioritizing plant-based protein sources when increasing daily protein intake.
Criticisms and Side Effects of Protein Supplements
Protein powders and bars are frequently fortified with vitamins and minerals, but they also often contain undesirable ingredients such as sweeteners, added sugars, artificial flavorings, and other additives. In fact, researchers from the German Sport University in Cologne have even detected doping substances in some products marketed for muscle development.
Teenagers may be particularly susceptible to adverse side effects from protein powders, which are predominantly made from milk proteins. Milk proteins can stimulate sebum production, potentially triggering or worsening acne, although a definitive causal link has not been established.
Furthermore, health professionals caution that reliance on protein shakes might cause adolescents to reduce their consumption of regular meals, leading to inadequate intake of dietary fiber, essential micronutrients, and healthy fats.
The Premium Price of High-Protein Products
Products marketed as protein-enriched typically carry a premium price tag. A 2022 consumer study revealed that naturally protein-rich foods like cheese, curds, and soy drinks are often priced higher simply because manufacturers emphasize their protein content on the packaging.
Even athletes with high protein demands do not necessarily require specialized supplements. The DGE recommends meeting nutritional needs through a well-optimized diet, stating that there is no scientific evidence supporting the necessity of protein-enriched food supplements under physical strain.
However, experts acknowledge that protein supplements can be beneficial for individuals with specific medical or physical challenges, such as allergies, digestive issues, difficulties chewing or swallowing, or significantly reduced appetite.
This article was originally published in German.
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