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Function Health, which offers members nutrition, supplement, and other lifestyle guidance based on a huge battery of lab tests and body scans, announced it raised $298 million from investors. The company is also launching a chatbot that will offer recommendations and explanations of test results based on user questions.

Function claims hundreds of thousands of members so obviously they’ve managed to convince a large number consumers that there is value to tracking granular data about what’s in their blood, and to the company’s recommendations. But there is light evidence for some of wh

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