What's the mathematical breakdown of what you need to maintain a healthy weight on a mostly or entirely plant based diet? I know the source is biased but these

What's the mathematical breakdown of what you need to maintain a healthy weight on a mostly or entirely plant based diet? I know the source is biased but these people have done the math: https://www.nomeatathlete.com https://www.nomeatathlete.com What's fun is the articles they've done on NFL players (like Brady, whose diet is 80% plants) who obviously have professionals working for them but have no negative performance issues.