I tried one of those all the veggies one could eat, but little meat, bread, etc, diet.
I noticed no matter how much lettuce salad I consumed, I always had a gnawing hungry feeling.
Finally, I said heck with this, and fixed some steak. The hunger dissipated almost immediately. Conclusion: Veggies are okay to supplement, but we are meat eaters.
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The main culprit seems to be carbs, because the body changes those into sugar.
The body starts converting starch into sugar, the instant it contacts saliva in your mouth.
When I grew up, my family had one day in the week that was totally meatless. I wished I had kept the tradition