Which vitamin is often associated with fruits and vegetables and aids in immune function?

Vitamin C is often associated with fruits and vegetables due to its high abundance in items like oranges, strawberries, kiwi, bell peppers, and broccoli. It plays a critical role in immune function by supporting various cellular functions of both the innate and adaptive immune systems.

One of its key roles is acting as an antioxidant, protecting cells from damage caused by free radicals and oxidative stress. Vitamin C also enhances the proliferation and function of lymphocytes, which are essential for the immune response. Additionally, it helps with the skin's defense system and enhances the barriers against pathogens, further contributing to its role in immune health.

This vitamin is essential for the synthesis of collagen, which is necessary for maintaining the integrity of skin and mucosal barriers—first lines of defense against infections. Thus, its association with fruits and vegetables is not only due to its presence in these foods but also because consumption of a diet rich in fruits and vegetables high in vitamin C is linked to better immune function and reduced risks of chronic diseases.