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Female rats benefited more than males, but both protected from kidney damage
(Charlottesville, Va.) June 27, 2022—New research in rats finds a diet high in the prebiotic fiber inulin offered a protective effect against the damage of a high-salt diet. The research will be presented this week at the American Physiological Society (APS) and American Society for Nephrology Control of Renal Function in Health and Disease conference in Charlottesville, Virginia.
“It is becoming clear that we need to think of our diets as a whole, with intertwining effects between each component.” — Study authors
Inulin is a prebiotic dietary fiber common in fiber supplements and found in foods like onions, artichokes and chicory root. Prebiotic fibers like inulin are not absorbed by the body but instead move to the large intestine where it is fermented by the healthy bacteria of the microbiome. Studies are increasingly showing links between byproducts of this fermentation and physiological processes in the body.
In the current study, researchers from Augusta University in Georgia used a rat model of salt-sensitive high blood pressure and chronic kidney disease to study the effects of this fiber. They fed the rats either a high-inulin diet or an equal amount of non-fermentable fiber. They then introduced the rats to a high-salt diet.
Female rats on the inulin diet had lower blood pressure than their counterparts fed non-fermenting fiber. Though male rats did not show this same reduction in blood pressure, both sexes had less protein in their urine and damage to their kidneys than controls.
Though human studies on the kidney-protecting effect of inulin are limited, especially those on sex differences, the researchers note that similarities between rat and human gut microbiota “may give us reason to speculate” that humans could show parallel effects. With further study into metabolic interactions, “dietary approaches could be utilized as either a preventative or alternative to medicine, especially for those predisposed to salt-sensitivity,” the researchers wrote.
Funding for this conference was made possible, in part, by 1 R13 DK132924-01 from the National Institute of Diabetes and Digestive and Kidney Diseases. The views expressed in written conference materials or publications and by speakers and moderators do not necessarily reflect the official policies of the Department of Health and Human Services; nor does mention by trade names, commercial practices or organizations imply endorsement by the U.S. Government.
NOTE TO JOURNALISTS: The Control of Renal Function in Health and Disease conference will be held June 26–30 in Charlottesville, Virginia. To schedule an interview with the researchers, conference organizers or presenters, contact APS Media Relations or call 301.634.7314. Find more highlights in our Newsroom.
Physiology is a broad area of scientific inquiry that focuses on how molecules, cells, tissues and organs function in health and disease. The American Physiological Society connects a global, multidisciplinary community of more than 10,000 biomedical scientists and educators as part of its mission to advance scientific discovery, understand life and improve health. The Society drives collaboration and spotlights scientific discoveries through its 16 scholarly journals and programming that support researchers and educators in their work.
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