When the grid goes down, immunity becomes a survival priority, fast. Without power, everything that normally protects you starts to break down. Sanitation drops, water quality becomes questionable, stress shoots up, sleep gets worse, and food variety shrinks. All of this weakens your defenses, making even small infections far more dangerous.  That’s why strong immunity isn’t a “health trend” in a collapse. It’s part of staying alive. And the smartest preppers know you can’t build that overnight, you build it with the foods you store long...