Where Does Human Body Get Inorganic Phosphate for ATP Cycle?

[prime-factor]

Where does the human body get the inorganic phosphate needed to carry out the ATP cycle. Is it derived from food, chemical reactions or does our body produce it?.

Thank you in Advance.

 

[JonMoulton]

We eat other organisms -- plants, animals, fungi. All of these contain nucleic acids, which contain phosphate groups.