Let's say a person eats nonstop bbq consisting of beef, lamb, pork and chicken including organs? and maybe once a week some milk, potatoes and some fruit?
Too much phosphorus, heme iron, carnitine (anti-thyroid), harmful amino acids. Lack of carbs leading to chronically elevated Cortisol levels. A gut microbiota that favors TMAO production (Nitric Oxide, heart disease). A greater assimilation of heavy metals/metalloestrogens like Lead and Cadmium.
Adding Kale to pork kidney for instance inhibits Cadmium absorption :
Cadmium bioavailability from vegetable and animal-based foods assessed with in vitro digestion/caco-2 cell model. - PubMed - NCBI