At that point, she decided to focus on building her company, and at the same time grew closer with Balwani, who she looked up to as a successful businessman who had worked with Bill Gates.
"He said that I was safe, now that I had met him," she said.
But, at the home they shared and in texts, Balwani told her she would never succeed if she did not "kill the old Elizabeth" by following an intense regime including waking at 4 a.m., eating certain foods and remaining laser-focused on her goals, she said.
Once valued at $9 billion, Theranos vaulted Holmes to Silicon Valley stardom. Theranos collapsed after the Wall Street Journal published a series of articles starting in 2015 that suggested its devices were flawed and inaccurate. She was indicted in 2018.
Holmes said she is not claiming that Balwani controlled her statements to investors, journalists or business partners. But she said she didn't question him as she should have, because he had taught her "everything I thought I knew about business." "He impacted everything about who I was. And I don't fully understand that," she said.
A healthcare regulator's negative report in 2016 shook her positive view of Theranos, and prompted her to make changes that Balwani did not like, Holmes testified. They broke up that year, she said.
Since the trial began in September, jurors in San Jose have heard evidence that prosecutors say proves Holmes defrauded investors between 2010 and 2015 and deceived patients once Theranos began making its tests commercially available, including through a partnership with Walgreens.
At the end of her direct testimony, Holmes' lawyer, Kevin Downey, asked why she never sold any of her 50% stake in Theranos, which was worth $4.5 billion, despite opportunities to do so.
"I believed in the company and I wanted to put everything I had into it," she said.
Holmes is scheduled to face cross-examination by a prosecutor on Tuesday morning when the trial resumes.
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