A demand for the average American to eat more meat would have to explain, as a baseline, why our already positive trend in meat consumption isn't yielding positive outcomes. There are potential explanations (you could argue increased processing offsets the purported benefits, for example), but those are left unstated by the website.
[1]: https://www.agweb.com/opinion/drivers-u-s-capita-meat-consum...
[2]: https://ers.usda.gov/data-products/chart-gallery/chart-detai...
(Note that I am neither a vegetarian nor a vegan.)
Because of old age. Being vegan increased your odds threefold to die of old age instead of prematurely from disease.
Apologies for not having a link to the source
A healthy, whole-food plant-based diet is linked to a lower risk of ischemic stroke, with studies showing reduced risk compared to meat-eaters. The conclusion of this paper[1] for example reads that "Lower risk of total stroke was observed by those who adhered to a healthful plant-based diet."
Additionally, researchers at Harvard found that a plant-based diet may lower overall stroke risk by up to 10%. [2]
1: https://pmc.ncbi.nlm.nih.gov/articles/PMC8166423/
2: https://hsph.harvard.edu/news/healthy-plant-based-diet-assoc...