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A study published in Aging Cell found that autophagy, the process cells use to recycle damaged material, does not change in one uniform direction with age. Patterns differed by cell type and sex, and among participants aged 70 and older, higher measured activity was associated with poorer measures of physical function. The findings are observational and do not show that autophagy causes those differences.
Researchers at Sanford Burnham Prebys Medical Discovery Institute report that autophagy does not uniformly decline with age: its measured activity varied across blood, skin and lab-derived neuron cells, and differed by sex. The study, published in Aging Cell on September 27, 2026, also found that greater activity among participants aged 70 and older was associated with poorer physical-function measures, challenging the assumption that more cellular recycling is always a sign of healthier aging.
Autophagy is a cellular recycling process that gathers damaged proteins and other waste, breaks them down and allows their components to be reused. It helps cells manage damage, and disrupted autophagy has been linked to diseases including cancer, cardiovascular disease, diabetes and neurodegenerative disorders. The new study does not establish that autophagy causes these conditions or that changing it would prevent them.
The research team collected blood and skin samples from volunteers aged 23 to 72, who reported no chronic medical conditions. Some skin cells were converted into induced neurons for laboratory study, giving the researchers three cell types to examine. They analyzed RNA transcripts associated with autophagy and, separately, directly measured the rate of the recycling process.
Results differed across the samples. In skin cells from male participants, autophagy activity decreased with age; in female skin cells, it stayed relatively stable. In induced neurons derived from female participants, activity increased with age. The researchers also found that gene-expression measurements did not reliably correspond to the directly measured recycling rates, cautioning against using those readings alone to infer how much autophagy is occurring.
Why a Single Aging Pattern Falls Short
The findings matter because autophagy is being studied as a possible target for healthy-aging interventions. If its activity changes differently across cell types and sexes, a single measure may not describe what is happening throughout a person’s body. Nor can an increase automatically be treated as evidence of improved health.
Among participants aged 70 and older, higher autophagy activity was associated with poorer measures of physical function across the three cell types. In blood cells, it was linked to lower aerobic fitness; in skin cells, to higher body mass index. In induced neurons, it was associated with weaker grip strength, lower metabolism and a higher resting heart rate. These are reported associations, not proof that autophagy produces those outcomes or that lowering it would improve them.
The findings also point to a measurement problem for future research: gene activity alone may not show how fast cellular recycling is taking place. Studies seeking to connect autophagy to health or test therapies may need to account for age, sex, cell type and direct measures of activity.
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How Researchers Tested the Recycling Process
Autophagy has often been described as declining with age, and that idea has helped motivate research into whether stimulating cellular cleanup could support health later in life. The study authors said evidence for a simple decline in humans is limited, particularly when results from different tissues and measurement methods are treated as if they represent the whole body.
To address that gap, the team compared gene-transcript data with direct measurements of autophagy in blood cells, skin cells and induced neurons. The sample came from volunteers who reported no chronic conditions, rather than a clinical group selected for a particular disease. The researchers’ findings therefore describe patterns in the studied participants; they do not establish how those patterns apply to every older adult.
“We commonly see people cite this idea that autophagy declines with age, but the actual evidence for this in humans is very thin.”
— Caroline Kumsta, senior and corresponding author and assistant professor at Sanford Burnham Prebys
What the Associations Cannot Show
The results do not establish why autophagy differed by age, cell type or sex, or whether those differences cause changes in physical function. The associations reported for participants aged 70 and older cannot show whether higher activity contributed to poorer measures, arose in response to other processes, or simply occurred alongside them.
The study’s participant range was 23 to 72, while the health associations are described for people aged 70 and older. The supplied report does not give the number of participants in that older group or enough detail to assess how broadly the results apply. It also does not provide the full statistical estimates or explain the strength of each association.
The source report begins to describe a further investigation into physical activity but ends before stating its results. It therefore does not confirm whether exercise changed autophagy, what activity was studied, or how large any effect may have been. No exercise recommendation or treatment conclusion can be drawn from the information provided.
Further Testing Across Age and Tissue
The study authors said more research is needed to understand autophagy at a cell-specific level and how age and sex affect it. Follow-up studies will need to test whether the reported patterns hold in larger and more varied groups, and whether measured activity predicts later changes in health rather than merely occurring alongside them.
Researchers will also need to examine the exercise question directly: the available report says the team investigated physical activity but supplies no findings from that part of the work. Until those results and further studies are available, the practical implications for exercise, aging interventions and disease prevention remain unresolved.
Key Questions
What is autophagy?
Autophagy is a process in which cells collect and break down damaged proteins and other cellular waste, allowing components to be reused.
Does autophagy always decrease as people age?
No. In this study, activity fell in skin cells from male participants, remained relatively stable in female skin cells and rose with age in induced neurons derived from female participants. The results show variation in the sampled cells, not a universal pattern for every tissue or person.
Does higher autophagy mean poorer health?
The study found that higher activity was associated with poorer physical-function measures among participants aged 70 and older. It does not show that autophagy caused those measures or that reducing autophagy would improve health.
Did the study show that exercise improves autophagy?
The report says the researchers also investigated physical activity, but the supplied account does not provide the findings. It does not confirm that exercise changed autophagy or support a specific exercise recommendation.
Source: rss
