TitleNutritional Interventions that Slow the Age-Associated Decline in Renal Function in a Canine Geriatric Model for Elderly Humans.
Publication TypeJournal Article
Year of Publication2016
AuthorsHall, JA, Yerramilli, M, Obare, E, Yerramilli, M, Panickar, KS, Bobe, G, Jewell, DE
JournalJ Nutr Health Aging
Volume20
Issue10
Pagination1010-1023
Date Published2016
ISSN1760-4788
KeywordsAbsorptiometry, Photon, Aged, Aging, Animals, Arginine, Biomarkers, Body Weight, Carnitine, Cross-Sectional Studies, Diet, Dietary Proteins, Dietary Supplements, Disease Models, Animal, Dogs, Female, Fish Oils, Fruit, Geriatric Assessment, Glomerular Filtration Rate, Humans, Kidney, Male, Thioctic Acid, Vegetables
Abstract

OBJECTIVE: To determine the effects of feeding traditional and renal protective foods (RPF) supplemented with functional food bioactives on glomerular filtration rate (GFR), lean body percent (LB%), and selected circulating biomarker and metabolite concentrations in a geriatric dog model.

DESIGN: Randomized block design and cross-sectional study.

SETTING: Hill's Pet Nutrition, Inc. dog colony.

PARTICIPANTS: Eighty-one geriatric dogs (mean age, 10.4; range, 7.9-14.2 years) and 30 mature-adult dogs (mean age, 5.0; range, 3.3-6.9 years).

INTERVENTION: Geriatric dogs were fed one of three foods (n = 27 per group) for 6 months: a traditional RPF (control) that was energy dense and mildly protein-restricted, or control food supplemented with increasing amounts of functional food bioactives: fish oil, lipoic acid, fruits and vegetables, and higher quality protein sources [functional foods one (FF1) and two (FF2)]. Geriatric dogs were compared before and after the feeding trial with mature adult dogs.

MEASUREMENTS: Renal function was assessed by GFR, LB% was determined by dual energy x-ray absorptiometry, and circulating biomarkers and metabolites were measured in blood.

RESULTS: Before the feeding trial, GFR (+28.2%), LB% (+18.6%), and serum total protein (+10.0%) were higher in mature versus healthy geriatric dogs (all P<0.001). Geriatric dogs consuming all three foods increased (P<0.001) GFR over time; group averages ranged from 13.0-16.9%. Dogs fed the highest supplemented level of bioactives (FF2) had lower (P<0.001) symmetric dimethylarginine (SDMA) concentrations (-14.3%). Feeding functional foods did not alter body weight, but increased (P<0.001) serum protein concentration (+6.7%).

CONCLUSION: Supplementation with functional food bioactives can temporarily reverse the age-associated decline in renal function and serum total protein.
DOI10.1007/s12603-015-0636-3
Alternate JournalJ Nutr Health Aging
PubMed ID27925141