Frequently Asked Questions
Is it possible to have an immune system that is too strong?
Yes. Autoimmune diseases are exactly this — the immune system is overactive and attacks the body’s own tissues. Conditions like rheumatoid arthritis, lupus, and multiple sclerosis represent immune overactivation, not underactivation. This is why “boosting” immunity without context is not a useful goal.
Does stress really affect immunity?
Yes. This is one of the best-studied areas in psychoneuroimmunology. Chronic stress reduces natural killer cell activity, suppresses antibody responses, and increases susceptibility to upper respiratory infections. The effect is real and clinically significant.
Should I take Vitamin D supplements?
If you are deficient (and most Indians are — this is worth testing), correcting the deficiency has genuine health benefits including for immune function. The standard recommendation is to test serum 25-hydroxy Vitamin D; if below 20 ng/mL, supplementation is indicated. Discuss the dose with your doctor.
Are there foods I should eat more of for immune support?
Rather than focusing on individual “superfood” items, prioritise dietary variety: multiple vegetables and fruits, whole grains, legumes, nuts and seeds, moderate fish intake, and minimising ultra-processed foods. Indian diets based on traditional whole-food patterns — dals, sabzis, roti, seasonal vegetables — are genuinely nutritious. The problem is usually the displacement of these by packaged and fast foods.
Can children take immunity supplements?
Most healthy children with adequate nutrition do not benefit from supplementation beyond what is recommended in standard paediatric guidelines. In India, Vitamin D supplementation is recommended for infants. For older children, supplementation should be based on confirmed deficiency or specific clinical recommendation, not on marketing.
This article is for educational purposes. It does not constitute medical advice and does not replace consultation with a qualified specialist. Dr. Keerthi Vardhan, MD (Internal Medicine), DM (Clinical Immunology & Rheumatology), Assistant Professor, NIMS Hospital, Hyderabad.