Ashton Kutcher has rushed back to Los Angeles from Brazil to support Demi Moore.

The 'Two and a Half Men' actor - who split from the actress in November amid allegations he had cheated on her - was said to be "deeply concerned" about his estranged wife after hearing she had been taken to hospital to be treated for exhaustion.

Flying back from his stint at Sao Paulo Fashion Week last night (26.01.12), Ashton is said to have been increasingly worried about the state of Demi's health.

A source told People magazine: "Ashton is deeply concerned for Demi. He still cares about her and wants the best for her."

It has now been claimed the 49-year-old actress - who is reported to be receiving treatment for eating disorder anorexia - had replaced food with caffeine-based energy drink Red Bull.

A friend of the star told The Sun newspaper: "Demi avoids alcohol and instead drinks tons of Red Bull when she goes out. But in recent months she's not been eating much, so she's also been drinking it in the day to give her energy to get through."

Demi - who was reportedly released from California's Sherman Oaks Hospital last night - "seemed drunk" when she was admitted to the medical facility on Monday (23.01.12), but it is thought it was just because of the vast quantities of Red Bull she had consumed.

The pal added: "She seemed drunk but I don't think any alcohol passed her lips, just loads of Red Bull. It's not a healthy way to live."