Check out this patent for a horse nugget, for example: https://patentimages.storage.googleapis.com/63/5b/ef/5e6b6bd...
So if you take that and realize there's more money in palatants for humans than in animals, that'll explain an entire obesity epidemic entirely without any other explanations.
But by dint of this fact, natural flavoring and proprietary crunchification processes and things like that are the thing which will not go away in the general movement against food additives. It's essential to the business.