Anne Hathaway is not overweight in the slightest, but she’s adopted a strict 500-calorie-a-day diet in an effort to lose two dress sizes for her “Les Miserables” role as Fantine. The diet is spartan, to say the least: it consists of a protein shake and two apples.

“Anne is playing a destitute factory worker-cum-lady of the night,” a source revealed. “Unfortunately, she only has 15 to 20 days to lose as much weight as possible — up to a stone and a half [21 pounds] — because she’s been filming the scenes showing her fit and healthy, almost slightly chubby. It’s not ideal but, as with any high-budget movie, there are strict time constraints.”

The source also indicated that Hathaway is getting weekly medical checkups to ensure her extreme diet doesn’t negatively affect her health. Stay safe, Anne!