It’s not healthy. More like it’s not that unhealthy. If you look at nutritional density by the numbers in actual data tables of all foods….red meat is almost all you need. Eggs. Shellfish or small oily fish. Plants are nothing compared to animals foods. Like nothing. Most humans that ever lived in time never ate cabbage and were far healthier and fit specimens. There’s a reason Northern Europeans and Central Asians average heights and IQs are larger than most of the planet. Agriculture came much later to them. All that crap we hear is mostly marketing and propaganda. Throughout most of history urbanized people could not reliably get meat into cities until the last hundred years so people became riddled with disease living shorter biological lives living off plants.