Oatmeal! 1 c. instant cooked has 176 mg of P (+ has fiber!)
Cereals with added nuts &/or whole grain have higher P.
Bran cereals are higher in P.
Recommended: 600-800 P mg/day per 2018 National Kidney Foundation’s Primer on Kidney Diseases.
NIH Publication No. 10-7407; https://www.niddk.nih.gov/-/media/Files/Health-Information/Health-Professionals/Kidney-Disease/PhosphorusTipsforPeopleCKD_EN.pdf