Health experts are shifting the focus from chronological age to a more holistic metric known as "intrinsic capacity." This approach assesses how well our physical and mental functions are performing to provide a clearer picture of the aging process.
The five pillars of the WHO’s intrinsic capacity model
As global lifespans continue to increase, the conversation around wellness is moving away from subjective feelings of fitness toward more concrete data. According to the report, the World Health Organization (WHO) defines intrinsic capacity as the total sum of physical and mental abilities an individual can utilize at any given time. Rather than simply counting the years since your birth, this model looks at how your body and mind are actually functioning in real-time.
Dr. Mohammed Enayat, a GP and longevity expert who founded HUM2N, exlpains that the WHO identifies five specific domains to track: locomotion, vitality, cognition, sensory function, and psychological health. By monitoring these specific areas, individuals can move past the societal constructs of age—such as career milestones or fertility—and focus on the actual mechanics of their well-being.
Why a high score won't predict cancer or heart disease
While this metric offers a more comprehensive view of health than a simple birthday, it is not a foolproof predictor of every medical outcome. Dr. Enayat notes that a person could theoretically score very highly across all five WHO domains and still face significant health threats. Specifically, intrinsic capacity does not directly account for the risk of developing cardiovascular disease or cancer.
This distinction is vital for readers to understand: being "functionally fit" in terms of movement and cognition is a massive win for independence, but it does not replcae the need for traditional medical screenings and the management of underlying clinical risks.
The search for a target score in observational studies
One of the most significant gaps in current research is the lack of a universal "gold standard" for what a healthy score looks like. While researchers have identified links between lower intrinsic capacity and higher mortality rates, the report notes that these findings are currently based on observational studies rather than definitive clinical benchmarks.
Because of this, Dr . hooper suggests that we shouldn't be obsessing over hitting a specific number in a fitness app. Instead, the real value lies in identifying personal trends. For instance, if you notice a decline in your walking speed, a loss of muscle strength, or changes in your cognitive processing, those are the specific red flags that warrant medical investigation.
Building capacity through strength training and midlife habits
The most encouraging aspect of this new framework is that intrinsic capacity is not a fixed trait determined at birth; it is something that can be actively built. Dr. Enayat emphasizes that lifestyle interventions—specifically regular strength training, high-quality sleep, and a nutrient-dense diet rich in protein—serve as the foundation for maintaining these capacities.
Experts also suggest that the window for building this resilience is much wider than most people think. Rather than waiting until your 60s or 70s to focus on longevity, Dr. hooper advises that people should begin prioritizing these habits from midlife onwards. The goal is to create a buffer of physical and mental strength that ensures a more active and engaged later life.
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