Energy (obtained from food through enzymatic reactions) is the basis of human movement. Enzymes are special proteins that facilitate chemical reactions inside our bodies. Sony's Bio Battery uses this same principle to produce electric energy. It is an extremely safe form of energy production since the fuel (glucose) is a carbohydrate just like bread or rice. Because glucose is a clean energy source---produced by plants through photosynthesis (a process that involves the absorption of CO2)---Bio Battery is also an eco-battery (*1). Sony commenced Bio Battery R&D in 2001.
Unlike fossil fuels, carbohydrates (glucose) are carbon neutral and do not contribute to increases in carbon dioxide.