Felix Mueller (Müller) describes himself as ‘An unlicensed biohacker, a licensed filmmaker and a polycystic kidney disease (PKD) patient’ who has immersed himself in finding ways to return his body to health since 2013. He has applied his knowledge to reducing his own kidney volume, as well as that of many others, and now ‘at a bit over 30 years old my kidney function is the highest it has been in my life’. He specialises in helping people using a cyclical ketogenic diet, activating cell clean-up (autophagy) and adjusting their lifestyle to improve their outcomes with PKD. He has built a worldwide PKD community of PKD sufferers online that is growing all the time (see https://reversingpkd.com).