The average adult human, with a typical weight of 70 kg or so, consumes
approximately 2800 calories per day. The energy released from food is
stored transiently in the form of ATP. Once ATP energy is used and ADP
and phosphate are released, our bodies recycle it to ATP through intermediary
metabolism so that it may be reused. The typical 70-kg body
contains only about 50 grams of ATP/ADP total. Therefore, each ATP
molecule in our bodies must be recycled nearly 1300 times each day