This book explores why health data is so valuable, how we’re giving it away, who wants to access it, and how we can wrestle back control.   Through wearables, consumer DNA tests, and even just the phones in our pockets, a vast and growing quantity of health data is collected every day. It can of course be helpful for health agencies to improve public health and can even allow us to perform better at sports.  But it all comes at a cost. In a world of increased surveillance, tech companies and cybercriminals are now in control and put profit above all else. This misuse risks not only our privacy, but perhaps even democracy itself.  Tech journalist Matt Evans shows us what we are giving away, how the data is used, and how we might reap the benefits without paying such huge costs. Featuring exclusive interviews with tech CEOs, lawyers and even reformed hackers, this is a deep-dive into the value of our health data and a manifesto for a new age of personal autonomy.