After reading from Dr. Mark Hyman I've learned it isn't, "we are what we eat" but, "we are what our food eats."
Whether you're eating meat or vegetables, you typically want to go organic and ingest food free from chemicals, pesticides or whatever other synthetic and unnatural products get laced on food.
These type of contaminants effect both meat eaters and vegetarians alike.
That being said, I have introduced regular fruit consumption as my go to for feeling better in life.

And Gurunath included, "eat plenty of greens!" telling the meat eaters in his satsang that it was okay to eat red meat, but to try and do so as a rare occasion/sparingly. I think Masters sometimes say things that might offend devotees because Masters are able to recognize and address all walks of life which can appear to be in contrast to the advice given to devotees.