It wasn't clear whether prisoners intended to abandon a protest that has roiled Guantanamo for more than four months and prompted President Barack Obama to renew his efforts to close a prison that holds 166 men.
Navy Capt. Robert Durand said most of the prisoners took part in a meal of lamb to break the first day of the traditional fast during the Muslim holy period of Ramadan, which lasts through the month. He also said it had been unusually peaceful in the camps, largely free of conflict between guards and prisoners.
"We are just pleased that they are for the most part eating and for the most part we are having good order and discipline in the camps," Durand said.
Ramadan, an important period in the Muslim calendar in which the observant abstain from food and drink from sunrise to sunset, has typically been a relatively tranquil period at Guantanamo. Prison officials issued a "pardon" that erased the men's accumulated disciplinary infractions and permitted many of them to pray together this week after having spent recent weeks largely isolated from each other.
Durand declined to speculate about whether the hunger strike might flare again after Ramadan. "I don't pretend to understand the psychology of the detainees and they don't always necessarily declare their motives."
Another possible factor is that prison officials recently allowed dozens of the men to return to communal living under certain new restrictions, including that they refrain from hunger striking.
The military said 45 of the prisoners were still on the "enteral feed list," meaning they can be strapped down and fed a liquid nutrient mix through a nasogastric tube. A U.S. federal judge on Monday called it a "painful, humiliating and degrading process," in a ruling in which she said she had no authority to order it stopped.
The military earlier said it would carry out the feedings only at night during Ramadan out of respect for the prisoner's religious beliefs.
Prison officials moved most of the prisoners out of communal units and into single, solid-walled cells, during a violent clash in April after prisoners covered the security cameras that allowed guards to monitor them.
Lawyers for prisoners have accused the military all along of undercounting the hunger strike numbers and they remained skeptical of the latest reports. "They have tried to downplay this from the beginning," said Carlos Warner, an Ohio public defender who represents 11 prisoners.
"All I hear from my clients is that they are going to keep going and they are not going to stop," said David Remes, a Washington-based attorney who represents five prisoners who were being force-fed. "Getting the president's attention isn't enough. Getting him to start sending detainees home is what he has to do."