- and supplements strengthen their immune system

Zinc is crucial for the immune system on multiple fronts. Animal-based foods such as meat and eggs are the best sources, as zinc from plant-based sources is less readily absorbed. As a result, vegetarians and vegans often have insufficient zinc intake. On the other hand, zinc supplementation can enhance the production of interferon and other components of the immune system, which are particularly important for defending against viral infections. This is highlighted in a study published in Clinical Nutrition. It is also important to note that aging and certain medications can increase the risk of zinc deficiency.

It is no coincidence that many people are affected by influenza and other respiratory diseases during the winter months, when vitamin D deficiency is more widespread. In a review article published in Nutrition Reviews, the authors describe how vitamin D plays a role in several parts of our highly developed immune system. In addition, vitamin D helps regulate inflammatory processes. This function is vital, as overactivation of the immune system in the form of hyperinflammation can make influenza and other respiratory infections complicated and, in the worst-case scenario, life-threatening. It is therefore important to ensure optimal vitamin D levels in the blood throughout the year.