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Health is elusive, ineffable—something we rarely think about when we have it, but everything when we don’t.
The mainstream healthcare system tells us that health is simply the absence of disease. Feeling unwell? There’s a prescription for that. But is health really just the lack of illness? If that were true, why do so many people without a diagnosis still feel fatigued, unfocused, or simply unwell? The truth is, health is not a binary state—it is a spectrum, a dynamic process that extends far beyond the limitations of traditional medicine. At Sage, we believe the best way to approach health is by measuring and improving function.
If we cannot adequately define health, how can we ever hope to improve it?
At Sage, we introduce a new perspective: health is best understood through function. Function is measurable. It is tangible. And when improved, it enhances not only lifespan but healthspan—the years of life spent in good health, not just in survival. True wellness isn’t about avoiding disease; it’s about sustaining energy, vitality, and independence for as long as possible.
Peter Attia refers to this as the "marginal decade"—the final ten years of life that determine whether you thrive or merely survive.
Physical health is more than just weight or muscle mass. It’s the ability to move freely, react quickly, and sustain activity. It’s your VO2 max, your grip strength, your flexibility, your endurance. Diet and exercise shape these metrics, and through measurement, we can identify how to optimize and improve them. Enhancing physical function leads to greater resilience, longevity, and an improved quality of life. And when you think about the last years of your life—will you be mobile, energetic, and strong, or confined to a chair, struggling to move? Subtle changes, like monitoring skin elasticity, hair strength, and nail condition, can provide early signs of nutrient balance, hydration, and overall physical resilience.
The brain is the command center of your health.
Cognitive function encompasses memory, intelligence, problem-solving, and neuroplasticity. It’s the key to preventing cognitive decline and ensuring lifelong mental agility. Through assessment, we can track how well your brain processes information and adapts—because maintaining cognitive sharpness is just as critical as maintaining physical strength.
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Beneath the surface, your body is a complex biochemical system. Metabolic function is the unseen engine driving everything from energy levels to inflammation, cholesterol, oxidative stress, and toxin exposure. It is measured through biomarkers—blood panels, lipid profiles, hormone levels—and lifestyle factors like diet and gut health. A well-tuned metabolic system is essential for long-term vitality and extending your healthspan. Even external cues—subtle changes in skin texture, hydration levels, and nail health—can provide key insights into internal metabolic function.
Health is not just biological—it is deeply emotional.
Resilience, the ability to adapt to stress and overcome setbacks, is a critical part of emotional function. Do you have strong, supportive relationships? Do you find meaning in your work and joy in your daily life? Emotional function is about more than just managing stress—it’s about fostering a state of agency and gratitude, leading naturally to empowerment and humility. By understanding and improving these aspects, we can cultivate a healthier, more fulfilled existence.
At the foundation of it all is behavior. Can you consistently make the right choices —getting enough sleep, exercising regularly, eating the right nutrients? Can you resist harmful habits like smoking, excessive drinking, or chronic stress? Behavioral function determines whether you can sustain positive change over time. Healthspan depends on the habits you build and sustain over time. Small but significant indicators, such as how well you maintain self-care habits, hydration, and dietary consistency, can reflect broader trends in your long-term behavioral health.
Your body is an intricate network of systems that work together to keep you healthy and functional. When one system experiences an imbalance, it can affect your overall well-being. Monitoring your body’s key functions - physical, cognitive, metabolic, and internal - allows you to gain insight into your health and catch potential issues before they become serious.
By regularly assessing your physical, cognitive, metabolic, and internal functions, you can detect early signs of problems like muscle weakness, memory decline, or metabolic imbalances. Early detection means you can take preventative steps, ensuring small issues don’t escalate into major health concerns.
Understanding how each function operates helps create a personalized health plan. Whether you need to improve your physical fitness, enhance cognitive function, or address metabolic concerns, personalized data enables targeted interventions that are unique to your body’s needs.
Each of these functions impacts the others. For example, poor metabolic health can lead to cognitive difficulties, and reduced physical activity can affect internal systems. Monitoring all aspects of your body ensures a more holistic approach to maintaining optimal health, rather than focusing on individual symptoms.
Proactive health management allows you to live a fuller, more active life. By keeping your body’s functions in balance, you can perform daily tasks with greater ease, stay mentally sharp, and maintain the energy levels needed to enjoy the things you love.
Health is complex, but function is measurable—and what gets measured, gets improved. At Sage, we provide the tools to track and enhance your function across these five key axes. Download the Sage app today and start quantifying your healthspan. Because true health isn’t just about living longer—it’s about living better, stronger, and more vibrantly for as long as possible.
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