Eating less reduced antibiotic-induced kidney injury in rats
Five weeks of 35% food restriction reduced kidney damage in male Wistar rats given gentamicin compared with antibiotic-exposed rats allowed unlimited food.
Our read
Interventions- Studied:
- Experiments in male Wistar rats, five weeks, against unrestricted rats given gentamicin
- What changed:
- Blood urea nitrogen was 81% lower in food-restricted rats than in unrestricted rats given gentamicin
- The catch:
- Food restriction also reduced micronutrient intake, so calorie reduction was not isolated
- In the record:
- One of 4,194 papers on caloric restriction on record: 638 with results in people, 1,499 in animals. Its result on inflammation agrees with 92 of 99 other findings on record; 3 point the other way and 4 found no change.
Editor of record: Boris Djordjevic · AgingResearch.News
In an animal experiment, researchers randomly assigned 3-month-old male Wistar rats to four groups. Each gentamicin group contained eight rats; each group without the antibiotic contained four. Restricted groups received 35% less food for five weeks. After four weeks, the antibiotic groups received gentamicin injections at 160 milligrams per kilogram of body weight daily for six days.
Compared with unrestricted rats given gentamicin, restricted rats given the drug had better kidney function and less structural damage. Blood urea nitrogen, a measure used to assess kidney function, was 81% lower. The restricted rats also had lower levels of chemically damaged proteins and greater activity of an enzyme that helps limit damage from reactive molecules. Their kidneys showed less inflammation, with fewer invading immune cells.
Why it matters
Tolerance to drug-related stress bears on the broader question of how to preserve organ function with age.
Caveats
This short experiment used only 3-month-old male rats, so it does not establish benefits in older animals or people. Food restriction also reduced micronutrient intake without supplementation, so the regimen did not isolate calorie reduction.
Caloric restriction is part of Bryan Johnson's Blueprint
The paper
Lomonosov Moscow State University
Antioxidants, May 22, 2026, Open access
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