Eating meat causes most of our major diseases.
It's not the meat itself, it's mostly the chemicals they add to it.
That too, but animal proteins are acidic and animal products activate various gene expression tools that are linked with various cancers, etc...also saturated fat and the weakening of blood vessels due to damage to endothelium from the acidity of animal protein causes issues as well.
Eating meat causes most of our major diseases.
The long-term health effects of eating grain have more dire consequences now that we have immunizations.