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Computerworld - Apple Inc. CEO Steve Jobs said today that a hormonal imbalance has caused the weight loss that had fueled speculation he was seriously ill. He is currently undergoing treatment.

In a rare open letter to the Apple community, Jobs acknowledged his weight loss, but said his doctors believed, and tests had confirmed, that a "hormone imbalance has been 'robbing' me of the proteins my body needs to be healthy."

"This was a restrained way of doing it," said Ezra Gottheil, an analyst at Technology Business Research Inc., when asked to comment on how Apple handled the news. "I just wish they had been quicker with it."

Apple had come under fire from several quarters since Jobs' health became a matter of concern to investors last June, when he appeared at Apple's annual developer's conference looking gaunt. Most talk centered around the possibility that he again had cancer. In August 2004, Jobs announced he had had surgery to remove a cancerous tumor in his pancreas.

After Jobs' June appearance, Apple officials pegged his weight loss to a "common bug" he had contracted. Some analysts found that explanation hard to believe and made repeated calls on Apple to come clean about the health of its CEO.

"It's my guess that it's been hard to diagnose," said Gottheil today in explaining why Apple had not spoken up before now. "They have a difficult job. They want to provide some disclosure, but there's nothing to be gained by disclosing uncertainty."

The treatment for his ailment, Jobs said in his letter, is simple and straightforward, but he did not spell out the details. He also noted that it will be months before he regains the lost weight. "Just like I didn't lose this much weight and body mass in a week or a month, my doctors expect it will take me until late this spring to regain it," Jobs said. "I will continue as Apple's CEO during my recovery."

In early trading Monday morning, Apple shares were up $2.74 to $93.49, a gain of 3%.

Although Apple had officially remained mum about Jobs' health since June, the CEO talked off the record with Joe Nocera, a reporter at The New York Times. Nocera reported only that Jobs' health problems "weren't life-threatening, and he doesn't have a recurrence of cancer."

Later incidents, including an obituary that was mistakenly published in August by the Bloomberg financial news service and a false report that he had suffered a major heart attack in October, sent Apple's stock tumbling. The October report, which had been posted to a CNN site populated with user-made content, pulled share prices down by nearly 11% before rebounding.