When Nobel laureate Dorothy Hodgkin deciphered the structure of vitamin B12, she demonstrated how invisible molecules shape the foundation of our health. In this tradition, we ask today: Can antioxidants – unassuming micronutrients and phytochemicals – make our immune system more resilient in practical terms? The answer is emerging: Yes, with smart selection and routine, inflammation, susceptibility to infections, and fatigue can be influenced – a lever for high performers who want to combine energy and longevity.

Antioxidants are compounds that neutralize reactive oxygen species (ROS)aggressive oxygen molecules that can damage cells. They protect lipids, proteins, and DNA from oxidative stress – a driver of aging processes and immune dysregulation. Important groups include polyphenolsplant protective substances such as catechins, flavonoids, carotenoidspigments in vegetables like beta-carotene, vitamins C and Eclassical antioxidants, water- or fat-soluble, as well as trace elements like zincessential metal ion that regulates hundreds of enzymes and immune processes. The immune system benefits in two ways: firstly, through less ROS overload in immune cells; and secondly, through modulated signaling pathways like Nrf2cellular "antioxidant switch" and NF-κBinflammation regulator, which determine the intensity of immune responses. The pattern is crucial: many small sources from whole foods work synergistically – complemented, where appropriate, by targeted micronutrients.

A plant-centered diet rich in berries, leafy greens, nuts, herbs, and spices provides a dense spectrum of antioxidants and immune-modulating molecules. Reviews show that such foods can activate or inhibit immune cells, depending on need, thereby supporting infection defense as well as regeneration ^[1]. Ethnobotanically used plants like shiitake, ginseng, turmeric, berries, or rosemary enhance the body's antioxidant capacity via Nrf2/Keap1, shift T-helper cell balances, reduce inflammation, and influence the gut microbiome – a trinity for better redox balance and robust immune function ^[2]. Green tea provides catechins, which inhibit viral adsorption and replication in experimental models; clinical studies suggest fewer cases of influenza and colds, although the evidence is still limited ^[3]. Zinc has antioxidant effects and orchestrates both innate and adaptive defense; a deficiency increases susceptibility to infections and chronic inflammation, while adequate intake stabilizes immune homeostasis ^[4]. Allium vegetables like garlic bring organosulfur compounds that dampen oxidative stress and NF-κB signals, thereby alleviating vascular, metabolic, and immune responses – with promising, though still somewhat lacking clinical evidence ^{[5] [6]}.

A broad review of everyday foods describes how a balanced diet rich in fruits, leafy greens, whole grains, and spices influences immune-relevant pathways: from vitamin and mineral supply to bioactive plant substances that activate, modulate, or influence immune cell signaling pathways. The relevance lies in everyday life: consistent, diverse intake rather than a single active substance approach ^[1]. A second overview focuses on traditionally used plants like shiitake, turmeric, berries, and holy basil. The authors indicate that these foods upregulate endogenous defense against ROS via Nrf2/Keap1, reduce inflammatory markers, and can even shift the ratio of Th1/Th2 cells – mechanisms that explain why subjective resilience and infection resistance can improve ^[2]. Additionally, a study on green tea analyzes experimental and clinical data: In vitro, catechins inhibit viral and bacterial processes; several intervention studies found fewer influenza cases through consumption or gargling with green tea, while other studies indicate reductions in common colds. However, the authors emphasize that larger, robust studies are needed to definitively demonstrate clinical efficacy – a classic case of "promising, but not yet final" ^[3].

- Consume a daily colorful plant-based diet: 1–2 handfuls of berries, a large portion of leafy greens (e.g., spinach, arugula), and a small handful of nuts/seeds. This combination provides vitamin C/E, polyphenols, and minerals for a resilient immune response ^{[1] [2]}.
- Drink 2–3 cups of green tea throughout the day. Opt for fresh preparation (2–3 minutes steeping) to retain catechins. Optionally: gargle with cooled green tea in cold seasons as an additional barrier – with preliminary positive study indications, albeit with still limited evidence ^[3].
- Incorporate garlic into warm and cold dishes: 1–2 cloves daily, ideally crushed and allowed to rest briefly to form active compounds. Thus, you utilize antioxidant and immune-modulating effects in your daily routine ^{[5] [6]}.
- Check your zinc intake: With a plant-based diet, intense strain, or frequent infections, a check can be sensible. A guideline value for adults is around 8–11 mg/day through food (e.g., legumes, nuts, whole grains, eggs). Supplements should be targeted and time-limited, ideally after consultation, as balance is crucial ^[4].
- Plan "polyphenol windows" around training: A berry smoothie or green tea in the post-workout phase can buffer oxidative stress without blocking training adaptation – thanks to a wide food matrix instead of high-dose single antioxidants ^{[1] [2] [3]}.

The coming years will clarify how we can dose and combine phytochemicals more precisely – from personalized Nrf2 activation to microbiome-supported strategies ^[2]. Larger, methodologically strong studies on green tea catechins, zinc strategies, and Allium compounds will determine which everyday routines provide the greatest clinical benefit for infection prevention and performance ^{[3] [4] [6]}.