An overwhelming majority of what we eat is made from plants and animals. This means that composition of our almost entire food is chemicals from the realm of organic chemistry (carbon-based large molecules). Water and salt are two prominent examples of non-organic foodstuffs - which come from the realm of inorganic chemistry. Beside some medicines is there any more non-organic foods? Can we eat rocks, salts, metals, oxides… and I just don’t know that?
In recent years, activated charcoal.
(Because many people apparently don’t know this: Don’t eat activated charcoal if you take any medication, it can render your medication ineffective)
Edit: Wait, I’m dumb, charcoal is very much carbon-based.