The New York Times reports:
Mr. Jobs suffers from immune system issues common with people who have received liver transplants and, as a result, his health suffers from frequent “ups and downs,” according to a person with knowledge of the situation, who agreed to speak on condition of anonymity because he was not authorized to discuss it.
In recent weeks, Mr. Jobs began a down cycle and slowed his activities at Apple, the person said. Mr. Jobs has been coming to the office about two days a week, and appeared increasingly emaciated, the person said. He frequently lunched in his office, rather than in the company cafeteria, the person said.