I am glad to see you clarify things a bit.
Putting aside the diversion into nitrates, the problem with the study was that it lumped natural fructose in with unnatural high fructose corn syrup. In doing so, it not only diluted the impact the study might have had against HFCS because it wrongly implied that natural fructose was equally as dangerous as HFCS, when such is absolutely not the case.
Cro-Magnon man survived largely off seeds, berries, roots, fruits, nuts, and some smaller prey such as insects and bird eggs. Berries and other fruits may have been scarce, but they surely did consume them whenever available.