There’s a serious danger facing seniors behind the wheel. Many haven’t heard of it and don’t even feel it. But it can unexpectedly cause low blood pressure, bringing on dizziness, fainting and loss of consciousness while driving. It’s dehydration. The Cleveland Clinic says when people get older, their sense of thirst diminishes. They may not even realize it. By the time they’re thirsty, they are already in the early stages of dehydration. Seniors easily get dehydrated because they have less water in their bodies due to body composition that “changes with age,” the clinic, an academic medical center which combines hospital care with educational ...