Late in the afternoon, Donna Joy headed out of the hospital to get her son a cheeseburger and fries that he requested.
"He hasn't eaten for two days, so how would you feel?" she told reporters.
She said her son hadn't suffered any frostbite or other injuries, but would spend the night at the hospital.
The weather conditions Sunday night and Monday night were bad enough that the search had to be suspended, and Joy survived by building a mound of snow that he fashioned into a shelter that he could crawl into, said Lt. Kevin Adam, the search coordinator.
Joy was in "remarkably good shape," and it helped that the winds weren't as strong in the valley where he was found as they were up on the mountain, Adam said.
"He did the right thing in building a snow cave, and obviously he's still alive to talk about it, so he made some good decisions," Adam said.
Joy and his father split up Sunday after taking a chairlift to the top of the mountain, and they took separate trails down in what was going to be the last run of the day, officials said. They planned to meet in a parking lot, and the father called for help when his son didn't show up.
The warden service, the Sugarloaf ski patrol, the Maine Forest Service, the U.S. Border Patrol, area rescue squads, Carrabassett Valley Academy ski volunteers and others had been searching for Joy on skis, snowshoes and snowmobiles, officials said.
Paul was not part of the official search team, but had seen the story on the news and decided to conduct an impromptu search on a trail known as the Caribou Pond Road. He owns property nearby and was out looking for Joy for about 90 minutes before the skier flagged him down.