According toa report in Grazia magazine, actress Angelina Jolie survives on as little as 600 calories a day, which is the equivalent of two bowls of cereal with milk.
"Angelina has been known to start her day with little more than a spoonful of coconut oil and a handful of cereal," a source told Grazia last week.
"The worrying thing is that she is so busy, she often forgets to eat. Sometimes she'll skip lunch altogether or will just grab a few almonds and some gummy bears while she's on the go, or will have a protein-based shake rather than anything more substantial. Then dinner could be something like a lean steak and a glass of red wine."
Angelina was forced to defend her skinny frame in 2007, when her weight dropped following the death of her mother Marcheline: "I have always been lean, and this year I lost my mum and I've gone through a lot. Instead of people saying I look like a person dealing with something emotionally, they assume it's because I want to fit into skinny jeans."
The Grazia source added: "What with her career, Brad and their six kids, Angelina has a lot on. Yes, stress plays a part. She is the type of person who drops weight when she's stressed out. She simply loses her appetite and can survive on almost nothing. But a lot of people are worried that she is taking things too far and that she won't have the strength to do all the things she wants to do if she doesn't gain some weight."
"Everyone has been begging her to eat more and she is trying not to get any skinnier, but unfortunately she just doesn't seem to be putting on any more weight."
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