The key with a high protein diet is "High Quality Protein". (assuming no pre-existing health issues). Beaks and feathers are protein but very hard on organs during processing. High Quality human grade muscle organs ... Preferably free range, hormone/antibiotic free,organic and of course US sourced. Protein has gotten a bad rap as associated with stress on organs due to (for the most part) low quality foods and the sub-par scraps that make up the foods.