Roger Daltrey has been paying serious attention to his health while out on the road for his current Use It Or Lose It solo tour. As many fans remember, during the Who's massive road trek in 2006/2007 behind their Endless Wire album, Daltrey fell ill numerous times with what many believed was a near-chronic bronchial infection.

In truth, Daltrey's condition was far worse than a simple illness, he had depleted nearly all of his body's sodium, which he now monitors constantly: "I was just completely wiped. My body temperature was going up and down all over the place, and my thyroid... I just went for a blood test and everything was out -- and there was no sodium. I mean, it was like, 'woo.' They were going to hospitalize me, I wouldn't let them. 'Cause that would've been like a prison to me. If I do any intensive work where I sweat, yeah, I take it immediately. Y'know ignorance is wonderful isn't it -- or not so wonderful when it catches you up (laughs)!" )

Daltrey not only is constantly on top of his sodium levels, but aware that this has been a lifelong problem which -- luckily -- hit rock bottom and probably saved his life: "I take hydrolytes all the time now. From that final crunch when it came -- and it was quite violent -- I didn't know how bad and serious that can be. I suddenly thought back on it and I've had this problem for years, where I gradually got run down on a tour -- and of course didn't understand that that's what it was. And of course now I'm older and the body doesn't recover quite so quickly. It manifested itself on the last marathon Who tour and boy did it lay me low. I'm still recovering from it basically."

Daltrey performs tonight (November 3rd) at Cleveland's House of Blues. He'll be on tour through the end of the month.