JARED LETO on the set of ' Chapter 27 ' being filmed on 72nd Street Central Park West. New York City, USA - 02.02.06

The PANIC ROOM star guzzled two pints of microwaved Häagen-Dazs ice-cream daily to play the chubby assassin in CHAPTER 27, and gained a speedy 65 pounds (29.5 kilograms) in the process.

As a result, Leto suffered from gout and his cholesterol levels shot up.

He says, "My cholesterol was so high they (doctors) wanted to put me on Lipitor (prescription cholesterol medication).

"I took a wheelchair to set every morning because I couldn't walk more than a few feet without excruciating pain."

Source: WENN