Inclusion Criteria:  Age ≥ 18 years For healthy controls: lack of kidney disease, heart failure, liver cirrhosis and peripheral edema For CKD stage 1-5: Estimated GFR < 90 mL/min/1.73m² For patients on maintenance hemodialysis or peritoneal dialysis: more than 3 months duration of therapy  Exclusion Criteria:  Pregnant, breastfeeding or intending pregnancy  Contraindication to MRI  Inability to tolerate MRI due to patient size and/or known history of claustrophobia. Mechanically implanted, electrically, or magnetically activated device or any metal in their body which cannot be removed, including but not limited to pacemakers, neurostimulators, biostimulators, implanted insulin pumps, aneurysm clips, bioprosthesis, artificial limb, metallic fragment or foreign body, tattoos, shunt, surgical staples (including clips or metallic sutures and/or ear implants.)