Pink doesn't drink alcohol because she "can't deal with hangovers".
The 'So What' singer - who is famed for her wild lifestyle and has previously admitted taking illegal drugs - has curtailed the amount she drinks as it has a negative impact on her performances.
Her husband Carey Hart, who she reunited with earlier this year, explained: "I don't really really drink anymore. Pink's actually gotten really good about it, too. Her tour is so intense that she's the same way as me. She can't deal with the hangovers.
"If she has an off night, she falls from her trapeze, so that's not so good."
Professional motocross racer Carey - who married the now 29-year-old singer in January 2006, with the pair taking time away from their relationship in February last year - added he and Pink are happy since reuniting, but have no plans to start a family yet.
He added to E! News: "It's a long ways down. She still has another 18 months of touring, and I'm pretty heavy in competing again in all my businesses, so it's definitely going to happen, but just not anytime soon."