When it came to walking her down the aisle, Chelsea Clinton wanted her father, former President Bill Clinton, to not only look good, but also be in the best of health. She instructed him to lose 15 pounds, something he did with gusto — he lost 20 pounds — by dropping the junk food and embracing an all-plant diet.

But Chelsea's wedding wasn't the main reason for going the veggie route. As he explained to Yahoo! in a recent video interview, future grandchildren are a big motivator for embracing a healthier lifestyle.

"I'm trying to be one of those experimenters," Clinton says. "Since 1986, several hundred people who have tried essentially a plant-based diet — not ingesting any cholesterol from any source — have seen their bodies start to heal themselves; break up the arterial blockage, break up the calcium deposits around the heart. 82 percent of people who have done this have had the result, so I want to see if I can be one of them."

The former president, who has had massive heart issues since 2004, plans on following the diet for a few more months and then evaluating where to go from there. Let's hope he sticks with it.

Check out his interview below:

Michael d'Estries ( @michaeldestries ) covers science, technology, art, and the beautiful, unusual corners of our incredible world.

Bill Clinton embraces vegetarian diet for good health
Former president says sticking to veggies has allowed him to drop more than 20 pounds.