---
title: Eating Fewer Calories Slowed the Buildup of DNA Mutations in Mice
description: A new study found eating 30% fewer calories reduced DNA mutations across mouse tissues. What it does and does not mean for aging in people.
author: Darie Nani (Editor-in-Chief)
updated: 2026-09-09T17:16:48.041Z
canonical: https://richhealthmagazine.com/article/eating-fewer-calories-slowed-the-buildup-of-dna-mutations-in-mice
image: https://cdn.nanimediahouse.com/calorie-restriction-dna-aging-276261.webp
categories: Longevity & Science
content_type: News
region: Global
publication: Rich Health Magazine
schema_type: Article
---

Mice that ate 30 percent fewer calories built up fewer DNA mutations across their tissues as they aged, according to a study published September 9 in the journal [Cell](https://doi.org/10.1016/j.cell.2026.08.013). Those mutations are the small errors that collect in DNA over a lifetime, and enough of them in the wrong place can seed cancer and other diseases, so slowing how fast they pile up is a long-standing goal in research on calorie restriction and aging.

## The First Genome-Wide Measurement of the Effect

Earlier work on eating less and DNA damage looked at single genes. This study measured the pattern across a large share of the genome, the first time anyone has done so. The work was led by Marta Gronska-Peski at NYU Langone Health, with Gilad Evrony at NYU Langone and Jonathan Shoag at University Hospitals Cleveland as senior authors, and collaborators at the National Institute on Aging and UT Southwestern Medical Center.

The diet lowered two kinds of mutation. One is a substitution, where a single DNA letter is swapped for another. The other is an insertion or deletion, where letters are added or lost. Both fell, though the size of the reduction differed from one tissue to the next.

## Eating Less Has Long Extended Animal Lifespans

Caloric restriction is one of the most reliable ways to lengthen life in laboratory animals. The new part is the genome-wide link between the diet and a lower mutation load.

The study shows the diet reduced mutations. It does not show that fewer mutations is why calorie-restricted mice live longer. Caloric restriction acts through several biological pathways at once, and a lighter mutation load is only one of them.

## Human Dieters Have Not Seen the Same Results

In the [largest randomized trial](https://pmc.ncbi.nlm.nih.gov/articles/PMC7415503/) of caloric restriction in healthy adults, people were asked to cut their calories by 25 percent for two years and managed only about 12 percent on average. The benefits that showed up were modest: small improvements in cardiometabolic markers such as LDL cholesterol, blood pressure and inflammation. The trial tracked those markers, not years of life. It also recorded real costs from sustained restriction, including measurable loss of bone density and muscle mass.

Results in mice carry over to people unreliably. Interventions that extend life in mice have repeatedly failed in human trials, and a few work in the opposite direction between the two species. For now the mouse finding points to a mechanism worth more study. It is not evidence that a person should cut their calories by a third.

## FAQ

**Q: Does eating less slow aging?**
In laboratory animals it slows several measures of aging. In the one large human trial, DNA-based aging "clocks" slowed by only about 3 percent over two years, a much fainter signal than the animal work.

**Q: Can calorie restriction extend a person's lifespan?**
No human study has shown it adds years. The human evidence is about health markers, not length of life, and in the main trial more participants dropped out than in the control group, a measure of how hard the diet is to keep up.

**Q: What is a somatic mutation?**
It is a change in the DNA of one of the body's ordinary cells, picked up during life from damage or copying errors rather than inherited from a parent. Because it is not in egg or sperm cells, it is not passed to children; it stays in the tissue where it arose.