A start-up company led by Adam Bosworth, former head of the Google Health team, plans to become the newest entrant to the online consumer health business. While the Web provides a great deal of generalized health information, health experts say the ideal would be to combine personal data with health information to deliver tailored health plans for individuals. That is what Bosworth and his San Francisco-based company, Keas Inc., will try to do. Health technology experts say Keas is at the forefront of the effort to combine advanced Web and database technologies so it can personalize health education.