Not in the sense of turning an aging brain back to a younger state. Some studies find improvements in particular cognitive abilities or shifts in MRI-based brain-age estimates, and interventions can address risks linked to cognitive decline. Those results show that the brain remains adaptable; they do not demonstrate that aging across the whole brain has been reversed.
What does “reversing brain aging” mean?
Brain aging is not one change that can be read from a single test. It involves multiple aspects of brain structure and function, while a cognitive test measures particular abilities and an MRI-based “brain age” is an estimate produced by a model. A change in one score or estimate cannot stand in for all the others.
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A younger brain-age score therefore does not, by itself, mean the brain is biologically younger. It means the model produced a different estimate from the measured data. To establish broad reversal, evidence would need to show durable, meaningful changes across relevant aspects of brain aging—not just a shift in one measure.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsIn practical terms, it helps to separate three claims: a person improves on a cognitive measure; an intervention reduces a risk or changes a biomarker; or the aging process of the whole brain has been reversed. The first two can be studied directly. They do not prove the third.
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What the studies actually show
Results depend on what was measured, who took part, and how long the study lasted. The findings below illustrate why a favorable result on one outcome should not be generalized to every aspect of brain aging.
| Study or evidence | Participants and period | What changed | What it does not establish |
|---|---|---|---|
| Intermittent-fasting and healthy-living diet trial, published in Cell Metabolism (2024) | 40 cognitively intact older adults with insulin resistance; eight weeks | Both diet groups had a decrease in MRI-derived brain-age-gap estimates. | A small, short trial in a selected group cannot show that either diet reversed whole-brain aging or that the estimate represents every aging process. |
| Randomized exercise intervention study (2024) | 485 older adults; intervention duration not stated in the source summary | No significant between-group difference in brain-predicted age difference. The intervention group improved on fitness, body-composition, and sleep measures. | Improvements in those measures did not translate into a significant between-group change in this brain-age measure. |
| U.S. POINTER, as summarized in the National Institute on Aging’s 2026 progress report | High-risk older adults; two years | A multidomain program combining exercise, diet, cognitive and social engagement, and health monitoring improved global cognition. | A cognitive result in this defined population is not proof of brain rejuvenation. Further analyses are examining mechanisms and subgroup effects. |
| SPRINT MIND findings, as summarized by the National Institute on Aging | Adults aged 50 and older; five years of treatment | Lowering systolic blood pressure to below 120 mmHg was associated with reduced risk of mild cognitive impairment in the study. | This finding supports clinical blood-pressure management for eligible patients; it is not a target for every person to pursue without medical guidance. |
| Randomized MIND diet trial, published in 2024 | Three years; participant details not stated in the source summary | The MIND diet group did not significantly differ from the control diet group in cognitive or MRI outcomes. | The result does not establish the MIND diet as a way to reverse brain aging. |
Why improvement is possible without reversing aging
The aging brain retains plasticity
Reviews of research involving healthy older adults and people with cognitive impairment describe continued potential for neuroplasticity—the brain’s capacity to adapt. Cognitive training, physical exercise, and non-invasive brain stimulation have been studied, and combined programs may offer greater potential for cognitive improvement than a single intervention. Plasticity is a capacity for change, not evidence that the overall aging process has been reset.
Exercise can help, but results vary
A 2024 review of exercise studies concluded that physical activity can benefit cognitive and brain-health outcomes in older adults, while noting that effects are often modest and can depend on the exercise program, participants, outcome measures, and comparison conditions. A separate 2018 systematic review assessed 98 studies and reported an association between 52 hours of exercise exposure and improved cognitive performance. That is a finding across studies, not an individual exercise prescription or proof of age reversal.
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The 485-person trial is an important counterpoint to broad claims about brain-age scores: fitness and other health measures improved in the intervention group, but the study did not find a significant between-group difference in its brain-predicted age measure. Different outcomes need not move together.
What lifestyle changes can reasonably aim to do
Current evidence supports focusing on cognitive health and modifiable risks rather than chasing a promise of a younger brain. A National Academies evidence review, summarized by the National Institute on Aging in 2017, described evidence for blood-pressure management in people with hypertension, cognitive training, and increased physical activity as “encouraging although inconclusive.” It identified diet, sleep quality, and social engagement as areas needing further research.
- Discuss blood pressure with a clinician. SPRINT MIND supports the relevance of blood-pressure treatment to cognitive risk in the studied population. The study’s target should not be treated as a self-directed goal for everyone.
- Choose activity for health and function. Exercise research supports potential benefits, but it does not promise that a particular routine will make an MRI brain-age estimate younger. A clinician can help tailor activity to a person’s health and abilities.
- Treat diet claims cautiously. The National Institute on Aging says findings on Mediterranean and MIND-style diets are not conclusive. In the three-year randomized MIND diet trial, cognitive and MRI outcomes did not significantly differ from the control group.
- Do not rely on supplements for prevention. The National Institute on Aging does not recommend vitamins or supplements to prevent Alzheimer’s disease or other cognitive decline. A finding from a daily multivitamin trial in older adults is not a general prevention or reversal recommendation.
How to assess a claim of “brain-age reversal”
When a headline or product claims to reverse brain aging, look for what the evidence actually measured:
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- Outcome: Was it a specific cognitive score, a clinical outcome, a risk factor, or an MRI-derived age estimate?
- Participants: Were they healthy adults, people with a particular risk or diagnosis, or a selected group such as older adults with insulin resistance?
- Duration and design: Was the evidence a randomized trial, an observational association, or a review? A short trial cannot establish long-term effects.
- Comparison: Did the result differ significantly between groups, or did a measure change within groups? Those are not interchangeable findings.
- Scope: Does the claim describe the outcome studied, or stretch a change in one measure into a promise that the whole brain became younger?
For evidence about cognitive health, these distinctions matter more than a dramatic label. A change in a proxy measure is not the same as a demonstrated improvement in everyday function, and neither alone establishes global reversal.
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