David admits that, at first, he didn't understand Garlin's compulsion to eat.
"I was on him, like, the first ... five years maybe, 'Well, you know, you don't, you don't, you don't need me with the Snickers mouth, do you? You know? Come on.' And he'd go, 'Yeah, you are right,' and he'd throw it away," David said.
Many don't realize that food addiction is a disease, not an addiction, Garlin said. Even his wife took a while to comprehend what her husband was battling.
"For years I always thought we could help him, he could help himself, and why isn't he following a diet? Or whatever, why isn't, why is he eating this? He doesn't need to eat it, he's full," Marla Garlin said. "I guess I was in denial. And I needed to be educated."
CLICK HERE to read an excerpt of Jeff Garlin's new book
Compulsive eating and food addiction has been a topic discussed more among women than men.
"There's something more masculine about being an alcoholic than being a compulsive overeater. You know, a guy, hard drinking guy, you know. The big, eating guy is not thought of as, as somebody with a problem," Garlin said.
Garlin said he stayed in denial even after his food addiction almost killed him. Ten years ago, just before starting the first season of "Curb," Garlin suffered a stroke.
"I was seven months pregnant and we had a 4-year-old," Marla Garlin said. "It was really rough, that was a rough time for us."
For years, Garlin would announce he was finally getting serious about losing weight. But all of his efforts would ultimately fail. Like many addicts, Garlin had to hit rock bottom.
Surprisingly, Garlin's bottom came in the guise of a catalog called "Living XL" he received in the mail.
"The premise of the catalog is, it says unique innovative products for tall and plus-size men and women. What it really is, is a catalog that helps you stay fat. Like, if you don't have a chair that can hold you, we've got the chair. A thousand-pound capacity!" Garlin said.
Among items in the catalogue was the "Living XL Wearable Sleeves Blanket" and the "Big John toilet seat," but what really changed Garlin's life was when he saw a man modeling the "Cabin Comfort Inflatable Pillow," who looked just like him.
"This is the last page of the catalog that I got, hey, fat person on the plane, wait, is that me? I had to look twice. I don't remember posing for this. It looks just like me," Garlin said. "And so that was a big motivating factor. I refer to that as my bottom, not my stroke, but seeing, it took vanity to see myself in the catalog."
"Curb" fans probably noticed that Garlin's slimmed down in season seven -- thanks in part to Garlin getting his bad eating habits backstage under control. (He now opts for grilled vegetables, instead of bagels and Cap'n Crunch).
Unlike many large comedians, Garlin didn't worry that by losing weight, he would lose his comedic edge.
"There are fat comedians that I have known in the past who were very fearful of that, some of them even died, you know," Garlin said. "It has nothing to do whatsoever with me being funny."
David agrees. "I don't think his humor is, is dependent on what he looks like. He is just a naturally funny guy. And listen, let's face it, chubby people are funny! I think there is a greater preponderance of funny chubby people than thin people."