What would happen if you never went outside? Not for a day — but for weeks. Your body needs sunlight to produce vitamin D. Without it, your bones weaken, your immune system slows down, your sleep schedule breaks, and your mood crashes. This has happened to people who stayed indoors too long. The fix is simple. Go outside — even for a few minutes a day. Follow for more short science-backed reality checks. #shorts #youtubeshorts #science #facts #didyouknow #lifefacts