I will read more about this. It does match my experience of my stress level rising quite a lot when I go through period of no or very little meat meals (based on beans, quinoa and stuff like that).
I think the whole plant-based diet is some sort of religious belief for moral superiority or something. The people who enforce those diets seem to not suffer too much because they tend to avoid using their brain and have rather low physical activity in my opinion. I personally have a very hard time sustaining a high level of physical activity and keeping my brain functioning on a mostly plant-based diet...