Quantified self is all about self quantification incorporating technology into data acquisition regarding inputs such as food, states such as mood, and performance such as mental and physical. These often combine wearable sensors, software interfaces and online communities. In a nutshell, it is self knowledge through numbers.
Biohacking is to use systems thinking, science, biology, and self-experimentation to take control of and upgrade your body, your mind, and your life. It is the art and science of becoming superhuman (definition from David Asprey).
You can find a presentation of mine on these topics on Slideshare.
I’ve been organizing the Quantified Self & Biohacking meetups in Finland. We have around 200 enthusiastic and exceptional people from various areas of life participating in this community. If you are interested, head over to http://www.quantifiedself.fi and my new Finnish blog.