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.)
[1]: https://globalactiontoendsmoking.org/research/tobacco-around...
[2]: https://www.cdc.gov/tobacco/about/cigarettes-and-cardiovascu...
People in India smoked just as much when they weren't living such sedentary lifestyles.
> People in India smoked just as much when they weren't living such sedentary lifestyles.
I suspect they also lived shorter lives for the aforementioned all-round mortality reasons.