(Photo Credit: Kristy Sparow/Getty Images)

After taking on the title role in his new movie "Jobs,"Ashton Kutcher, 35, admits he got so into the character of Steve Jobs that it forced him into the emergency room early on in the filming process.

Kutcher not only developed an uncanny resemblance to the Apple founder, he also took on Jobs' diet, namely a fruitarian diet from the book the "Mucusless Diet Healing System," where most sugars are cut out.

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"[The book] talked about the value of grape sugar and that was probably the only pure sugar you could have in your body," Kutcher told reporters during a "Jobs" press conference today in New York City. "I think the guy who wrote that book was pretty misinformed. My insulin levels got pretty messed up and my pancreas kind of went into some crazy, the levels were really off and it was painful. I didn't know what was wrong."

In addition to the dietary changes, Kutcher lost 18 pounds for the role and personified Jobs in various other ways, getting deep into who the man was other than just in the public eye.

"I started consuming the things that he consumed, I started studying entrepreneurs he admired, listening to the music he listed to, eating the food he ate and walking the way he walked," Kutcher said. "He'd go for a walk when he wanted to have a meeting with someone and I just started doing that and started walking without shoes on and wearing Birkenstocks and going for one-hour walks every day."

Walking like Jobs wasn't easy for the former "That 70s Show" star, who said it shocked his body to mirror someone else's steps.

"It was uncomfortable but I think it served a purpose," he said.

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Jobs was known to be very demanding on his employees, something that Kutcher defended.

"There were some things that Steve Jobs' approach seemed very blunt and unkind," Kutcher said. "However, it was that same blunt discernment that allowed him to create the amazing products he created."

Kutcher added that a demand for perfection, like Jobs had, led the world to have the products from Apple like the iPhone and iPad that it takes for granted.

"[Products where] my 7-year-old nephew can do Face Time," he said. "And my 80-year old grandmother is a member of a private social network called Path and she shares photos and recipes with the family."