How Vitamin D Shapes Your Immune System: From Infections to Autoimmunity

Dr. Kumar’s Take:

This in-depth review highlights the powerful role vitamin D plays in our immune system. It’s not just about bones—vitamin D helps our body fight off infections and may even prevent autoimmune diseases like MS, type 1 diabetes, and lupus. The key mechanism? Vitamin D helps immune cells produce antimicrobial peptides like cathelicidin and regulates inflammatory T cells. If your vitamin D levels are low, you may be missing out on this important immune support.

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Vitamin D Deficiency: More Than Just Rickets

Dr. Kumar’s Take:

Vitamin D deficiency isn’t just about rickets—it’s a widespread issue that affects bone health, immunity, muscle strength, and even the risk of cancer and heart disease. This review highlights how essential vitamin D is and why most people likely need more than current guidelines recommend.

If you spend most of your time indoors, live at a high latitude, or rarely eat fatty fish, chances are your vitamin D levels are too low. Daily supplementation with vitamin D3 and sensible sun exposure are simple ways to support long-term health.

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