05/08/2009 AT 06:15 PM EDT
The last two days had become unbearable for Mia Farrow, who took to her blog to say, "I'm really struggling" and "I won't be able to continue much longer."
On Friday – day 12 of going without food
to draw attention to the people of war-torn Darfur – the 64-year-old actress and humanitarian wrote,
"I have ended this fast."
"I have been instructed by my doctor to stop my fast immediately due to health concerns – including possible seizures," wrote Farrow. "I am fortunate. The women, children, and men I am fasting for do not have that option."
Airline magnate Richard Branson says that he will take over the fast for the next three days. Share your comments here