How does vitamin D support immunity?

Vitamin D sets your immune system's activity level. To keep your body's defenses functioning optimally, it tells your immune cells when to step up and when to back off. This means not only bolstering your response to those nasty foreign invaders, but also helping to rein in the response to prevent any overzealous actions. Most of us need more vitamin D, especially during periods when there's less natural sunlight available.

Vitamin D directly stimulates immune cells that fight infectious disease. "It empowers T-cells to identify and destroy invading viruses and bacteria quickly. This nutrient also improves how macrophages consume and kill pathogens," Waldron told us. "Without it, our immune system functions at less-than-maximal levels."

This vitamin is an "inflammation regulator," preventing excessive immune responses. It modulates cytokine production, ensuring balanced reactions to threats and preventing harmful inflammation that can damage healthy tissues. Proper vitamin D levels maintain this delicate balance in your immune system.

Many people develop vitamin D deficiency in the winter months. Sunlight is a limited resource. Individuals with darker skin tend to synthesize vitamin D at a slower rate than those with paler skin. Regular blood tests will reveal your levels. Only your medical professional can advise you on how to treat it effectively.

"Combine sun exposure with diet for optimal vitamin D levels. Eat fatty fish like salmon several times a week. Drink fortified dairy- or plant-based milks every day. In the depths of winter, consider mushrooms exposed to UV light. This way, you can maintain a steady supply throughout the year!"

Read the full article: 10 Immune Boosting Foods to Know