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Part of HHS Secretary Robert F. Kennedy Jr.'s Make America Healthy Again vision is "that every American is wearing a wearable within 4 years," he said recently. Wearable health technology is rising in popularity, but doctors say these devices have both potential and significant drawbacks.

Wearables include smartwatches, bracelets, and rings that use a variety of built-in sensors to track blood oxygen saturation, heart rate, sleep patterns, heart activity, workout metrics, body temperature, and blood pressure, though these measures vary from model to model, as does the accuracy of the data. People most often use these devices for f

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