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Immune Cell Nutrition – Key Nutrients for Immunity

Immune cell nutrition refers to the targeted supply of nutrients that support the function and defensive capacity of immune cells. A balanced diet is essential for a strong immune system.

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Things worth knowing about "Immune cell nutrition"

Immune cell nutrition refers to the targeted supply of nutrients that support the function and defensive capacity of immune cells. A balanced diet is essential for a strong immune system.

What is immune cell nutrition?

Immune cell nutrition refers to the deliberate intake of nutrients that support the activity and function of the cells that make up the immune system. The immune system consists of a wide range of specialized cells – including T cells, B cells, natural killer cells, and macrophages – all of which depend on an adequate nutrient supply to fight pathogens effectively. Poor nutrition can significantly weaken immune defenses and increase susceptibility to infections.

Physiological basis

Immune cells continuously require energy as well as specific micro- and macronutrients to maintain their protective functions. Cell proliferation (division), the production of antibodies and cytokines, and phagocytosis (the uptake and destruction of pathogens) are all directly dependent on the availability of key nutrients. A well-nourished body can respond to infections more quickly and effectively.

Key nutrients for the immune system

Vitamins

Vitamin C: Supports the function of phagocytes and lymphocytes, promotes antibody production, and acts as a potent antioxidant. Recommended daily intake according to the WHO: 45–110 mg.
Vitamin D: Regulates the activity of T cells and macrophages; deficiency is associated with increased susceptibility to infections. Recommended daily intake: 600–800 IU (15–20 µg) according to major health authorities.
Vitamin A: Essential for the integrity of mucous membranes as the first barrier against infection, and for the differentiation of immune cells.
Vitamin E: Protects immune cell membranes from oxidative stress and supports T cell function.
Vitamins B6, B9 (folate), and B12: Essential for the proliferation and maturation of immune cells, as well as for DNA synthesis and protein production.

Minerals and trace elements

Zinc: Indispensable for the development and activation of T and B cells, as well as for the function of natural killer cells. Zinc deficiency significantly impairs immune responses.
Selenium: Supports antioxidant defenses and immune cell activity; influences cytokine production.
Iron: Necessary for lymphocyte proliferation and the function of immune defense enzymes.
Copper: Involved in the antimicrobial activity of neutrophils and cytokine regulation.

Amino acids and proteins

Glutamine: Primary energy source for lymphocytes and macrophages; supports the intestinal barrier as part of the immune system.
Arginine: Promotes T lymphocyte proliferation and the production of nitric oxide (NO), which has antimicrobial properties.
Cysteine: A precursor to glutathione, an important antioxidant protective molecule in immune cells.

Fatty acids

Omega-3 fatty acids (EPA and DHA): Exert anti-inflammatory effects by reducing the production of pro-inflammatory eicosanoids, and support the function of B cells and natural killer cells.

Other bioactive compounds

Polyphenols (e.g., from berries, green tea, turmeric): Exert antioxidant effects and can modulate inflammatory processes.
Probiotics and prebiotics: Promote a healthy gut microbiome, which is closely linked to the maturation and regulation of the immune system.
Beta-glucans (e.g., from oats and mushrooms): Activate macrophages and natural killer cells, thereby enhancing innate immune defenses.

Dietary strategies to support the immune system

A Mediterranean-style diet, rich in vegetables, fruits, legumes, whole grains, fish, and high-quality plant oils, is one of the best-studied dietary patterns for supporting the immune system. Additional factors that play an important role include:

Adequate fluid intake (at least 1.5–2 liters of water per day)
Avoidance of heavily processed foods, sugar, and trans fatty acids
Regular meals to maintain stable nutrient levels
Consideration of individual needs (e.g., in older adults, pregnant women, and athletes)

When is supplementation appropriate?

With a balanced diet, additional supplementation is generally not necessary. In certain situations – such as nutrient deficiencies, chronic illnesses, pregnancy, or older age – targeted supplementation with dietary supplements (e.g., vitamin D, zinc, omega-3 fatty acids) may be beneficial following medical consultation. However, excessive doses of individual nutrients should be avoided, as they can lead to adverse effects.

References

Calder, P.C. (2022): "Nutrition, immunity and COVID-19". BMJ Nutrition, Prevention & Health, 3(1), 74–92. DOI: 10.1136/bmjnph-2020-000085
World Health Organization (WHO): Nutrition and immunity. Geneva, 2020. Available at: www.who.int
Gombart, A.F., Pierre, A., Maggini, S. (2020): "A Review of Micronutrients and the Immune System – Working in Harmony to Reduce the Risk of Infection". Nutrients, 12(1), 236. DOI: 10.3390/nu12010236

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