How parenting may slow brain ageing: new study

The results, published in Proceedings of the National Academy of Sciences, are based on data from nearly 37,000 adult participants and indicate that the impact of parenthood can accumulate with each new child.

How was the study conducted?

• Data source: The analysis was based on the UK Biobank database, a large-scale biomedical resource that includes brain scans and family information.
• Main indicator: Scientists studied the functional connectivity between different areas of the brain, testing how these areas interact. Particular attention was paid to networks responsible for movement, touch and social contact.

Key findings

1. Inverse changes
   Under normal circumstances, as people age, connectivity in certain regions of the brain decreases. However, the opposite trend was observed in parents: the more children they had, the more strongly this functional connectivity was preserved.

2. It was the same for mothers and fathers
   The result appeared in both sexes, suggesting that this is a consequence of parenting experience (physical activity, social interaction) rather than purely biological pregnancy factors.

3. Cumulative effect
   The difference in performance increased with each additional child. This may indicate that the more children parents raise, the more actively their brains adapt and strengthen the connections related to movement, sensory and social interaction.

The important role of the social environment

According to the authors of the paper, having children implies an intense "social context": more meetings, more contacts, the possibility of an extensive support network. This serves as a kind of "environmental enrichment" in which the brain is forced to work harder and keep cognitive functions at a high level.

• Physical activity: Parents often move more (games, walks).
• Social communication: Socialising with the child, relatives and friends.
• Cognitive load: Dealing with the many tasks associated with parenting can stimulate different parts of the brain.

Who benefits

The researchers emphasise that the findings may have implications beyond the classic parent + biological child model. A similar "socialisation and support effect" could potentially be obtained when there is a large social network or group activity, where the individual is in an environment where high social and motor activity is required.

Caveats

1. Sample Limitation: The vast majority of subjects were UK residents. In other cultures where family structures may differ markedly, results may be different.
2. Unknown mechanisms: Scientists cannot yet definitively explain exactly how the process of parenting leads to changes in the brain.

Conclusion

Although parenting is often seen as a stressor, the new study shows another side: parenting may work as a 'protection' against age-related changes in the brain by strengthening key networks related to movement, touch and social behaviour. Scientists hope that in the future they can further understand which aspects of parenting affect the brain the most and how to use this knowledge to promote cognitive health in the general population.

Research:
Edwina R. Orchard et al, Protective role of parenthood on age-related brain function in mid- to late-life, Proceedings of the National Academy of Sciences (2025). DOI: 10.1073/pnas.2411245122