Affiliate Marketing Secrets

First of all, I don’t believe this assertion.
Is there anything other than masses of misinformed people, and the marketing departments of animal food businesses that shows any link between the two? There is no secret about the relationship between industry lobbyists and government agencies which have there be food groups such as “meat” and “dairy.” Other countries in the world have food guides which are not centered around animal food like this.
I would honestly like to know if there is any solid credible information in favour of “animal protein being necessary.”
Thanks.