Matt Damon relished piling on the pounds for his latest movie role - because he could treat himself to all his favourite foods.
The 38 year old stars as bipolar whistleblower Mark Whitacre in dark comedy thriller The Informant!, based on the 2000 book of the same name.
Damon had to gain 30 pounds (13.6 kilograms) for the part - and he happily indulged in fat-packed fast food and alcohol to bulk up.
He tells the New York Daily News, "I definitely got doughy. I started eating like crazy and drinking dark beer.
"Between meals on set, I'd eat a No. 1 Value Meal at McDonald's and then Doritos on top of it. It was absolute heaven."
The Informant is relased in November.
And 2009 is a busy year for the actor with Margaret, Green Zone and Invictus, a biopic of Nelson Mandela all in the pipeline.
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