Frank Jimenez was 73 years old when he learned his kidneys were failing, but he wasn't exactly used to feeling sick and tired. For decades he'd worked 10 to 12 hour days, running his theater supplies business. He was a lifelong athlete who built his own house in the countryside outside of Sonoma, Calif. His doctor had no idea what had caused his kidney failure, and he hadn't faced anything like it before. "I'd never been sick in my life," he says. "It was a shock."
Frank worked hard to stay healthy and keep his kidneys going with a good diet,[...]