By far the most important source of disruption of the environment comes from the use of fossil fuels for energy. (religion-online.org)
Blood sugar, also known as blood glucose, is the primary source of fuel for energy production, particularly for your muscles, brain, and other parts of the body. (thyroidadvisor.com)
Our metabolism converts the food we eat into fuel for energy, which is needed for everything we do, from walking to running to thinking to working. (barbararodgersonline.com)