I discovered a number of resources online that will help, together with CatInfo.org's food chart and Tanya's FelineCRF.org food lists. On the other hand, although very handy and great, I discovered these lists were not exactly current, and a few of the foods cited as small phosphorous on People lists https://petshopnearme11009.theideasblog.com/36071095/pets-delight-an-overview