New Jersey native and filmmaker Kevin Smith is celebrating a "chunky milestone" in his weight loss journey following a massive heart attack that could have ended his life earlier this year.

Smith, 48, wrote on Instagram Saturday that he has lost 51 pounds since his heart attack in February, surpassing his weight loss goal of 50 pounds. The Mallrats director thanked his doctors and daughter, Harley Quinn Smith, as well as Weight Watchers, for which he became an ambassador in April.

"This is the lightest I've been since high school," Smith wrote. "My hope now is I can slowly lose another 10 with #weightwatchers and get down to my birth weight of 195."

Smith this year had a massive heart attack while taping a recently released TV special. The director, at the time, was suffering a 100 percent blockage of his LAD artery, which is often fatal, and required emergency surgery.

This @weightwatchers Ambassador is thrilled to announce that I’VE LOST 51 POUNDS! Six months ago from right now, I was in the hospital recovering from a heart attack I’d had the night before. When I went to my Doctor a week later, she told me “The best thing you can do for yourself now is to lose 50 pounds.” Half a year later, I can report that I followed Doctor’s orders: I started at 256 and now I weigh 205. This is the lightest I’ve been since high school! My hope now is I can slowly lose another 10 with #weightwatchers and get down to my birth weight of 195! But for now, I’m ecstatic to have reached this chunky milestone! I wanna thank #pennjillette for his book #presto, @raycronise for getting me started with his potato famine, and the good folks at #weightwatchers for their app-based program that made it easy to keep track of and control my eating! And I also wanna thank my kid @harleyquinnsmith - the little vegan astronaut who explored this meatless/milkless galaxy ahead of me, leading by example. Since I never wanted to see the inside of a hospital ever again, I simply copied the Kid. So this wasn’t a diet: these results came from a total lifestyle change of eating solely plant-based foods (which is tough because I hate vegetables). But mostly, I wanna thank all of you as well - for the kind and encouraging words along the way. Never underestimate the power of positive feedback: you folks telling me I looked better or healthier helped me stick with it. An encouraging word can really make a difference in someone’s life and your compliments kept me going! And just look where I went! #KevinSmith #WWambassador #WWFreestyle #WWFamily #WWBros #weightlosstransformation #weightloss #WWCommunity #ad *People following the Weight Watchers program can expect to lose 1-2lbs per week.

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"If I hadn't canceled the second show to go to the hospital, the Doc said I would've died tonight," Smith said at the time.

This most recent weight loss check-in comes following one in April from Smith, when he said online that he had lost 32 pounds up until that point. Smith that month appeared at the Tribeca Film Festival, where he attended a screening of his daughter's film, All These Small Moments. As daughter Harley said at the time, Smith had recently gone vegan.

"He's doing really, really great," Harley told the Daily Mail. "He's the healthiest he's ever been."

All the better for Smith fans, who are currently awaiting the debut of the director's next film, Jay and Silent Bob Reboot. A reboot of 2001's Jay and Silent Bob Strike Back, the film is tentatively scheduled for a 2019 release.