With the cold wave limiting outdoor movement and fog obscuring the sun, millions of Indians are facing a "sun deficit." This isn't just about vitamin D; it directly impacts mental health. In a health bulletin released this Saturday, experts from a leading Delhi hospital highlighted the connection between sunlight exposure and metabolic rates.

The concept of the "Winter Golden Hour" (11 AM to 1 PM) is gaining traction. During this window, the sun is at its highest point, and its infrared rays can penetrate the skin to warm tissues directly, providing deep-seated heat . "Even 15-20 minutes of midday sun exposure can reset your internal clock, boost serotonin production, and help regulate the thyroid gland—the body's primary thermostat," explains Dr. Devendra Singh.

For those in high-pollution areas or with no access to sun, the recommendation is to mimic this rhythm. Open your windows to let in whatever light is available, or invest in a daylight-spectrum lamp. Combine this with a short indoor walk. "Movement generates heat and tells your body it's daytime," Dr. Singh adds. This simple "Midday Fix" can combat the lethargy and low mood that often accompany the tail end of a long winter .