In a new interview with The Huffington Post, Chelsea Clinton reveals that her father's switch to a plant-based diet in 2010 not only gave him renewed energy and health - but also dramatically turned back the clock on his heart. 

"He went to the doctor recently," Chelsea tells Marlo Thomas. "And his doctor told him that his heart today is much younger than it was even 10 years ago. So that thrills me, because selfishly I want my dad around for a very long time."

That's big news for a former president not only once known for his love of Big Macs than vegetables, but also significant heart troubles.

"He didn't need my mom or me to pressure him to do that. I think having a quadruple bypass surgery was sufficiently sobering. And I am profoundly grateful that he really radically changed his life," she said. Since making the switch, Chelsea says her father has lost more than 30 pounds.

"I just decided that I was the high-risk person, and I didn't want to fool with this anymore. And I wanted to live to be a grandfather," Clinton told AARP the magazine last year. "So I decided to pick the diet that I thought would maximize my chances of long-term survival." 

Check out Chelsea's interview with Marlo Thomas below:

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