Here’s the ugly contrast: without enough B12, the nerves feeding your legs start to misfire. The muscles can be fine, but the message arrives scrambled. It’s like trying to run a factory with severed power lines — the machines are there, but nothing turns on.

But that’s not even the part that matters most. The real shock is how many older adults are low in B12 without knowing it, because stomach acid drops with age and the body stops pulling the nutrient out of food efficiently.