There are many, many, more complicated areas of research, including most other areas inside biology. We have millenia of trial-and-error as a starting point for nutrition. The fundamentals haven't changed, although the problems are new and inventive.

Anyways, I'm not complaining about it being hard or complicated, I'm complaining about it being low quality and corrupt. For instance: https://www.npr.org/sections/thetwo-way/2016/09/13/493739074...