From the WP:
A month-old hunger strike at the U.S. military prison at Guantanamo Bay, Cuba, has grown to include at least 128 detainees, 18 of whom are forcibly receiving intravenous fluids or nutrition in the prison hospital, military officials and detainee lawyers said yesterday.
The captives are protesting their indefinite imprisonment and what they describe as beatings administered by the prison's Immediate Response Force (IRF)-- squads of military personnel who are dispatched to put down disturbances in detainees' cells. Some have said they will refuse to eat until the military gives them a fair hearing or they die, according to their attorneys.
I have no idea whether the detainees' allegations about beatings by an IRF team are true. But it's worth remembering the case of former Gitmo guard Sean Baker who posed as a prisoner during a training session and sustained brain damage after, yes, being beaten by an IRF team. It's also worth remembering that Gitmo is the military's most-scrutinized detention center, so one would expect the treatment there to be better than say at the Bagram prison in Afghanistan.