Kevin Smith has lost 20lbs since his near-fatal heart attack.

The 47-year-old director - who previously lost 90lbs in seven years - required emergency surgery when he was hospitalised last month but has made great progress in less than two weeks after taking inspiration and guidance from magician Penn Jillette's book 'Presto!', which chronicled his 100lb weight loss, and advice from dietary nutrition researcher Ray Cronise.

He tweeted:''I'm officially down 20 pounds as of this morning! 20 pounds in 13 days & my blood pressure is amazing. How did this happen? @pennjillette & his book ''Presto'' turned me on to @RayCronise and his program at http://justsides.com My Doc said lose 50 pounds. 20 down, 30 more to go! (sic)''

The 'Clerks' filmmaker also showed off a gift he received from the writers of 'Supergirl', a jersey designed by the series' storyboard artist Jeremy Simser, depicting a cybernetic construct housing his now-healthier heart.

He captioned the Instagram post: ''My new jersey commemorating my life & death battle with arch nemesis, The Widow-Maker!

''This open-heart crest, drawn by @supergirlcw storyboard artist @jeremysimser, was a gift from sweet storyteller @etcarrasco and the @supergirlwriters in the show's writing room. (sic)''

The note was accompanied by a kind note celebrating Kevin's battle with the ''deadliest of foes''.

He revealed it read: ''A crest to commemorate your big win against the deadliest of foes, the wrathful Widow-Maker. We could've made you the man with the Kryptonite heart, but this wasn't your Kryptonite. We could've given you an Arc Reactor, but that's the competition. And anyway, the best part about you is your heart's always your own. Wear it on your sleeve, or in this case, smack dab in the center of your jersey. - The Supergirl Writers'' Thank you, my Super wordsmiths! I believe, in this jersey, a man can fly! #KevinSmith #supergirl #supergirlwriters (sic)''

The 'Jay and Silent Bob Strike Back' helmer was forced to cancel a show in California because of his terrifying ordeal, and later explained on Twitter that if he hadn't rushed himself to the hospital, he wouldn't have survived.

He wrote at the time: ''After the first show this evening, I had a massive heart attack. The Doctor who saved my life told me I had 100% blockage of my LAD artery (aka ''the Widow-Maker'').

''If I hadn't canceled show 2 to go to the hospital, I would've died tonight. But for now, I'm still above ground! (sic)''