Cause that's what the literature says. Every week there's more science coming out establishing the link between animal protein and these chronic diseases. To add onto what Eldron alluded to, the world isn't ravaged by riboflavin deficiency, but by heart disease, diabetes, obesity, cancer, etc. Just a few days ago: Association of Animal and Plant Protein Intake With All-Cause and Cause-Specific Mortality Conclusions and Relevance In this large prospective study, higher plant protein intake was associated with lower total and CVD-related mortality. Although animal protein intake was not associated with mortality outcomes, replacement of red meat protein or processed meat protein with plant protein was associated with lower total, cancer-related, and CVD-related mortality. https://jamanetwork.com/journals/jamainternalmedicine/article-abstract/2748453
