How much of the human body is processed sunlight?
I think that Carl Sagan said it best:


  The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff.


The current view of cosmology is that every atom that isn't hydrogen, helium, or lithium was created in the fusion furnace in  the hearts of giant stars. These heavy atoms were then spread about the place by supernovas.

However, there's a lot more to the matter that makes up living creatures than just the atoms. The vast majority of the free energy that allows for the creation of intricate organic molecules with complex patterns of chemical bonds (e.g. protein, DNA, etc.) does indeed originate with our sun.