How could diet affect the common cold?

Diet is mainly related to the common cold through immunity. Diets that are sufficient in energy, micronutrients, and macronutrients are important for maintaining a robust immune system, which will help reduce the risk and severity of common cold infections.^[1] Flavonoids (plant compounds that have antioxidant and immunomodulatory properties; found in especially high quantities in tea, chocolate, capers, and oregano)^[2] may be a noteworthy nutrient for this purpose.^[3]