Long‐term safety of dietary salt: A 5‐year ProspEctive rAndomized bliNded and controlled stUdy in healThy aged cats ( PEANUT study)

Brice S Reynolds (1) , Valerie Chetboul (2, 3) , Jonathan Elliott (4) , Jeremy Laxalde (5) , Patrick Nguyen (6) , Isabelle Testault (7) , Laetitia Dorso (8) , Jérôme Abadie (9) , Hervé P Lefebvre (10) , Vincent Biourge (5)

1 InTheRes - Innovations Thérapeutiques et Résistances
2 UCA - Unité de cardiologie d'Alfort
3 IMRB - Institut Mondor de Recherche Biomédicale
4 Royal Veterinary College [London]
5 Royal Canin Research Center
6 ONIRIS - École nationale vétérinaire, agroalimentaire et de l'alimentation Nantes-Atlantique
7 Centre Hospitalier Vétérinaire Atlantia
8 CHUV - Centre Hospitalier Universitaire Vétérinaire d'Oniris [Nantes]
9 LabOniris - Fédération des laboratoires d'analyses vétérinaires d'Oniris
10 ENVT - Ecole Nationale Vétérinaire de Toulouse

Abstract Background High‐salt diets promote urine dilution and decrease urolithiasis risk. Objective Prospectively evaluate the safety of chronic high dietary salt intake (randomized controlled trial). Animals Twenty research colony neutered, healthy aged cats (11.5 years [10.0‐11.6], median [interquartile range]). Methods Healthy cats were randomized to control or high‐salt dry diets (sodium: 1.02 ± 0.16 [mean, SD] and 3.26 ± 0.30 g/Mcal metabolizable energy [ME], respectively; chloride: 2.26 ± 0.33 and 5.71 ± 0.28 g/Mcal ME, respectively), fed for up to 60 months. Assessments included CBC, plasma biochemistry, urinalysis, glomerular filtration rate (GFR), blood pressure, renal and cardiac (conventional Doppler and 2‐dimensional color tissue Doppler) imaging, annually. Cats that died or were euthanized underwent necropsy. Diet effects over time were evaluated with linear mixed models. Results Follow‐up duration (median [Interquartile range]) was similar between the control (38.7 months [28.6‐48.2]) and high‐salt group (51.4 months [45.7‐59.0]). Diet had no significant effect on changes in GFR, blood pressure, plasma creatinine concentration, end‐diastolic left ventricular (LV) wall thicknesses, LV internal diameters, LV systolic function, left atrial size, or systolic and diastolic Doppler variables. One control cat developed hypertension. One high‐salt group cat developed persistent azotemia. Serial plasma biochemistry and urine specific gravity suggested early chronic kidney disease in 4 nonazotemic cats (2 per group), consistent with necropsy findings. Conclusions and Clinical Importance In healthy aged cats, a commercial veterinary diet containing 3.26 ± 0.30 g/Mcal ME sodium was safe with regard to renal and cardiac function for up to 5 years.

Mots clés: Blood pressure; Cardiovascular health; Glomerular Filtration Rate; Kidney health; Sodium chloride; Urolithiasis

Domaines: Sciences du Vivant [q-bio]

Brice S Reynolds, Valerie Chetboul, Jonathan Elliott, Jeremy Laxalde, Patrick Nguyen, et al.. Long‐term safety of dietary salt: A 5‐year ProspEctive rAndomized bliNded and controlled stUdy in healThy aged cats ( PEANUT study). Journal of Veterinary Internal Medicine, inPress, ⟨10.1111/jvim.16952⟩. ⟨hal-04371468⟩