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Renée Zellweger—who has demonstrated an impressive ability to turn zaftig for a role in roughly the same amount of time it takes to adopt an approximation of an English accent, only to take the weight off as quickly as you can say "red carpet photographers"—explained to a reporter at the premiere for Miss Potter (Zellweger Plump British Heroine Index: 8.7) how she managed to return so effortlessly to the skeletal frame that serves as the blank canvas she can later fatten as required:

Ren e Zellweger, who showed up looking svelte at Sunday night's London premiere of her new movie, Miss Potter, credits her slim figure to her work.

She says that the 20-minute lunch breaks she was allotted while making another movie, Case 39, helped her stay fit.

"That's all we got on the set," the Cold Mountain Oscar winner tells PEOPLE. "At that point, I was like, you know, forget it. And running around ... everywhere, that helps."

The details of Zellweger's Working Actress Diet will be little consolation to the many of her peers currently struggling on the Unemployed Actress Diet: Since starring in major studio releases is probably not much of a possibility, they're stuck with the classic but far less desirable option of limiting their daily intake to three green beans and a pack of Splenda, a splurge they can later reverse with a little jaunt to the ladies room to "powder their uvulas."