The former president adopted a plant-based diet four years ago after undergoing emergency heart surgery Since adopting a vegan lifestyle, the 67-year-old has lost 30 pounds By Ashley Collman PUBLISHED: 23:40 EST, 17 March 2014 | UPDATED: 23:43 EST, 17 March 2014 In an interview with the Huffington Post, daughter Chelsea Clinton says her father recently went to the doctor for a check-up and the physician told him his heart is 'much younger than it was even 10 years ago' The 67-year-old took up the plant-based diet and lost 30 pounds after undergoing an emergency heart surgery in February 2010.