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jessaustin isn't saying proper nutrition is a waste of time, but rather that nutritional research is of exceptionally poor quality due to the amount of money on the line for the vested interests that fund the studies.

To your second point, the problem is that we don't know who is right and who is wrong. The studies are conducted so poorly or with such bias that it's near impossible to have concrete recommendations.

It's common for Doctors and Biochemists themselves to do shitty science in spite of their fancy titles, as evidenced by the vast amount of contradictory and non-reproducible results in both fields [1]. Obviously the field itself isn't a waste of time but it's unfortunate that there's so much noise that it may as well be.

[1] http://www.nature.com/news/1-500-scientists-lift-the-lid-on-...

The OP did not say that proper nutrition is a waste of time, but rather nutritional medical research is flawed, so advice coming from said research is not useful.