The brain volume decreases with age, but this loss of tissue does not follow the same pace in all individuals. Measuring brain trophicity, that is to say, the state of nutrition and structural maintenance of nervous tissue, allows for the evaluation of a person’s aging trajectory well beyond their chronological age. The question that arises today is: to what extent does this trophicity actually condition life expectancy?
Biomarkers of brain trophicity and geriatric assessments in France
Since 2024, a European directive (directive health 2024/567) promotes the integration of biomarkers of brain trophicity into annual geriatric assessments. In France, this evaluation has become mandatory for individuals over 75 years old in the public health system.
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This regulatory framework changes the game. Until now, brain atrophy was primarily detected during targeted diagnostic assessments, often at an advanced stage. Systematic evaluation allows for the identification of decline trajectories before the appearance of manifest cognitive symptoms. The Scheltens scale, used to quantify hippocampal atrophy, is among the tools employed in these assessments.
The relationship between brain trophicity and life expectancy thus takes on a concrete clinical dimension: early monitoring paves the way for targeted interventions rather than mere passive observation of decline.
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Hippocampal atrophy and mortality risk: what recent data shows
The hippocampus plays a central role in memory and stress regulation. Its size decreases with age, but the rate of this atrophy varies significantly from person to person. Data from the UK Biobank has highlighted a correlation between preserved neuronal plasticity in centenarians and moderate cognitive exercise maintained over the long term.
| Factor | Impact on brain trophicity | Link with life expectancy |
|---|---|---|
| Moderate cognitive exercise | Preservation of neuronal plasticity | Positive correlation with prolonged healthy life expectancy |
| Omega-3 rich diet (Mediterranean populations) | Better resilience of trophicity to aging | Significant gap compared to Northern European populations |
| Transcranial stimulation (tDCS) | Stabilization of brain trophicity | Reduction of functional declines in active seniors |
| Absence of stimulation, sedentariness | Acceleration of hippocampal atrophy | Increased risk of Alzheimer’s disease and early mortality |
This table summarizes data from recent publications. Mediterranean populations show superior brain resilience compared to Northern European populations, a gap attributed notably to the intake of omega-3 in daily diet, according to a study published in Ageing Research Reviews in February 2026.
Transcranial stimulation and stabilization of brain tissue
Among non-pharmacological interventions, transcranial direct current stimulation (tDCS) draws attention. Multi-center pilot trials reported in Neurology in November 2025 indicate that this technique allows for a measurable stabilization of brain trophicity in active seniors.
tDCS does not restore lost tissue. Rather, it acts as a brake on the rate of atrophy, which alters the trajectory of cognitive and functional decline. For patients at risk of Alzheimer’s disease, this slowing down could represent several additional years of independent living.
However, these results come from hospital pilot trials. The transition to routine clinical use still requires larger-scale validations, and the technique remains reserved for structured protocols.
Gene therapies targeting brain trophicity: a preclinical horizon
The most forward-looking angle concerns gene therapies directly targeting the mechanisms of brain trophicity. These approaches, still in the preclinical phase, aim to modify the expression of genes involved in neuronal survival and the production of neurotrophic factors.
The goal is no longer to slow down atrophy but to attempt to reverse tissue loss trajectories. If preclinical results are confirmed in humans, this could transform the relationship between biological brain age and life expectancy.
Several technical challenges remain to be resolved:
- The blood-brain barrier limits the delivery of gene vectors to target areas, notably the hippocampus and prefrontal cortex
- Cell specificity must be sufficient to avoid effects on non-targeted neuronal populations, which could generate functional imbalances
- The duration of therapeutic gene expression remains uncertain: a transient effect would require repeated administrations, complicating the benefit-risk ratio
These therapies will not be available in the short term. Their interest lies in the paradigm shift they represent: moving from managing decline to actively restoring brain tissue.
Diet, cognition, and population differences
The study published in Ageing Research Reviews compared the resilience of brain trophicity between Mediterranean and Northern European populations. The former maintain a more stable brain volume during aging, an advantage correlated with a diet rich in omega-3.
This finding goes beyond simple dietary recommendations. It suggests that the nutritional environment over several decades shapes the trajectory of atrophy, well before the appearance of symptoms. The late diagnosis of hippocampal atrophy, often associated with Alzheimer’s disease, could thus be partly prevented by dietary habits established as early as adulthood.
Women also present a specific risk profile. Hormonal variations related to menopause accelerate volume loss in certain brain regions, reinforcing the importance of early monitoring through geriatric assessments now regulated by European legislation.
Brain trophicity is not merely a fixed anatomical measure. It reflects the accumulation of protective or deleterious factors over a lifetime. Systematic diagnostic tools, interventions like tDCS, and, in the longer term, gene therapies are gradually redefining what it means to age with a functional brain. The link between maintaining brain tissue and years of healthy life is becoming a significant axis of research and public health policy in its own right.