Your body needs energy. you eat but your body can't use that directly so it converts glucose into
which is quick
energy your body can use. This happens in the

take a shower or drink water or take a walk

Best Coal, oil, food, and natural gas cannot be recycled in the conventional sense. I suppose carbon dioxide produced from burning coal and oil can be recycled and converted to methanol. Food waste and human and animal waste (the product of food) can be composted. Natural gas produces carbon dioxide when burnt and that could be converted to methanol and reused. In the conventional sense of recycling none of those choices is actually possible. In the unconventional sense, almost everything is recycled eventually by geologic cycles whether we make any effort or not. Nature has been recycling for about 14 billion years now.