“As a human being, you have no choice about the fact that you need a philosophy. Your only choice is whether you define your philosophy by a conscious, rational, disciplined process of thought and scrupulously logical deliberation - or let your subconscious accumulate a junk heap of unwarranted conclusions, false generalizations, undefined contradictions, undigested slogans, unidentified wishes, doubts and fears, thrown together by chance, but integrated by your subconscious into a kind of mongrel philosophy and fused into a single, solid weight: self-doubt, like a ball and chain in the place where your mind's wings should have grown.” Ayn Rand
The Question Before the Answer: Where Philosophy Meets Science
Philosophy and science are often treated as separate intellectual disciplines, yet the boundary between them is far less distinct than we might imagine. Both are driven by the pursuit of truth, the desire to understand reality, and the recognition that our current knowledge is incomplete. What distinguishes them is not necessarily what they seek to understand, but how they approach the questions before them. Philosophy examines the meaning, assumptions, and conceptual frameworks through which we interpret the world, while science investigates the observable mechanisms, relationships, and conditions that govern it. Their methods differ, but their contributions are deeply interconnected.
Historically, one of philosophy's most important contributions has been conceptual clarification: examining the questions themselves before attempting to answer them. What do we actually mean by health, disease, intelligence, consciousness, causation, or even life? Are our questions coherent? Are we confusing distinct categories of explanation? What assumptions have become so deeply embedded in our language that we no longer recognize them as assumptions? These are not merely exercises in semantics. The concepts we use determine what we look for, how we organize information, what we consider relevant evidence, and ultimately, which conclusions we believe are justified.
In this sense, philosophy helps untangle the intellectual knots that arise when our language, assumptions, and methods become confused. Science, meanwhile, becomes particularly powerful when questions can be translated into clearly defined variables, measurable relationships, and testable hypotheses. Once a problem is sufficiently clarified, empirical investigation can begin distinguishing what is plausible from what is demonstrable. Yet scientific discovery rarely brings inquiry to a definitive end. Explaining one mechanism often reveals several others; resolving one uncertainty exposes a more intricate set of questions. As our understanding becomes increasingly precise, the boundaries of what remains unknown expand alongside it.
The relationship is therefore not a one-way progression from philosophy to science, but a continuous exchange. Philosophy helps clarify what we are trying to understand; science investigates how it works and under what conditions; and the resulting discoveries challenge us to reconsider the concepts and assumptions with which we began. Each discipline informs and refines the other in an ongoing cycle of intellectual development—an infinite spiral staircase in which every answer changes the perspective from which we ask the next question.
This relationship becomes especially important in healthcare, where many disagreements that appear scientific are, at least in part, philosophical disagreements left unresolved. Is a particular disorder a distinct disease entity or a point along a continuum of human variation? Does an abnormal biomarker represent a cause of dysfunction, a consequence of it, or merely a contextual association? Should a patient's condition be understood primarily through molecular mechanisms, interactions among physiological systems, or the individual's lived experience? These questions cannot always be resolved through additional measurements alone, because they also require clarity about what is being measured, which level of explanation is appropriate, and what constitutes a meaningful outcome.
The longstanding tension between mechanistic, reductionist, holistic, and systems-oriented approaches to medicine illustrates this challenge. Each perspective directs attention toward different aspects of biological reality, and each can offer valuable insights while remaining incomplete on its own. Molecular mechanisms can explain how particular processes operate, while systems-level perspectives help us understand how those processes interact within the larger organism and its environment. Neither perspective eliminates the need for the other. Problems arise when we mistake a useful level of explanation for an exhaustive account of the phenomenon itself.
Without philosophical clarity, science risks accumulating increasingly precise data in pursuit of poorly defined objectives, producing technically correct answers to fundamentally confused questions. Without empirical investigation, philosophy risks constructing elegant explanations that remain unconstrained by reality. And without the judgment required to translate both into practice, even sound conceptual frameworks and reliable scientific findings may fail to produce meaningful benefits for the people they are intended to serve.
This introduces a third dimension particularly relevant to medicine: the art of clinical practice. If philosophy helps establish meaning and science investigates mechanisms, clinical practice requires the judgment to determine how that knowledge should be applied to an individual person within a particular context. It is where conceptual understanding and empirical evidence meet the complexity of human biology, personal circumstances, competing priorities, uncertainty, and individual values. Effective healthcare depends on all three working together, continually informing and refining one another as new information emerges.
We might think of philosophy as sharpening the lens, science as revealing the details within the frame, and clinical practice as determining what to do with what we can see. The clearer the lens, the more meaningful the observations; the more detailed the observations, the more sophisticated our questions become; and the better we integrate both, the more intelligently we can act.
But the order matters. Investigating mechanisms before adequately clarifying the concepts and context in which they operate can create extraordinary technical sophistication without corresponding improvements in understanding or clinical utility. The quality of our answers will always be constrained, at least in part, by the quality of the questions we choose to ask.
And nowhere is this more consequential than in healthcare, where the very concept around which the entire system is organized remains surprisingly difficult to define.
Before we can understand disease, prevent illness, or improve human well-being, we must first confront a deceptively simple question:
What is health?
"All models are wrong, but some are useful." George E. P. Box
“What then is time? If nobody asks me, I know; but if I were desirous to explain it to one that should ask me, plainly I do not know.” Saint Augustine
Imagine walking into a medical school auditorium filled with some of the brightest up-and-coming providers in the country. Many have spent their lives pursuing academic excellence, fascinated by the human body and inspired by the prospect of healing others. Every single one of them, at one time or another, had individually been sparked by the idea of “health” as an internally-driven vocation - more than a career - a life-calling. Would their answers be the same or different?
Now imagine walking into a hospital and asking ten experienced veteran physicians to define health. You still might receive ten different answers. One describes health as the absence of disease. Another emphasizes normal laboratory values. Some focus on physical function, psychological well-being, or quality of life. Others emphasize longevity, resilience, independence, or the ability to perform everyday activities. None of these answers is necessarily wrong. Yet each captures only part of a much larger picture.
The problem is subtle but important:
Many definitions describe the indicators, expressions, or outcomes of health rather than the underlying nature of health itself.
It is like defining wealth by describing expensive houses or defining intelligence by listing college degrees. These things may correlate with the concept, but they do not adequately explain the concept itself. And when an entire healthcare system operates without a shared understanding of its most fundamental objective, the consequences extend far beyond philosophical disagreement. They influence what we measure, what we diagnose, what we treat, what we reimburse, and ultimately, what we consider a successful outcome. Before asking how to improve health, perhaps we should establish what we're actually trying to improve.
The Language Problem: Are We Even Talking About the Same Thing?
One of the most influential philosophers of the twentieth century, Ludwig Wittgenstein, devoted much of his work to understanding how language shapes thought, meaning, and human understanding. His philosophy offers an important insight: Many disagreements persist not because people lack intelligence or evidence, but because they are using the same words in different ways.
Consider the vocabulary of modern healthcare:
Health. Disease. Wellness. Comprehensive. Fitness. Medicine. Healthcare. Prevention. Recovery. Resilience. Treatment. Healing. Toxicity. Optimization.
We use these words constantly, often assuming their meanings are universally understood. But are they?
Consider the word toxic. It can describe a legitimately hazardous chemical exposure, a strained interpersonal relationship, an undesirable workplace culture, or an ingredient someone has decided to avoid. The same word is being used to describe fundamentally different phenomena.
Or consider the word healthy.
An orange is generally considered a healthy food. But eating a diet consisting of only oranges would eventually produce serious nutritional deficiencies. How can something be healthy in one context and unhealthy in another? Because health cannot always be understood by examining something in isolation. Context matters. So do dosage, duration, frequency, individual susceptibility, and the relationship between a particular exposure and the organism experiencing it.
A behavior that is beneficial at one dose may become harmful at another. Exercise builds physical capacity, but excessive training without adequate recovery can produce injury, exhaustion, and declining performance. Even the word fitness requires clarification. Fit for what? Running a marathon? Recovering from surgery? Raising children? Performing demanding physical labor? Living independently into old age? A person can be exceptionally fit for one task and poorly prepared for another.
Occasionally, the confusion is more entertaining: I once had a male patient point to his neck and explain that he had pain in his "cervix." He meant his cervical spine. A seemingly insignificant linguistic mistake, but an excellent reminder that using the same terminology does not guarantee we're discussing the same anatomy, much less the same problem.
Now consider the consequences when this ambiguity moves beyond an individual conversation and becomes embedded in clinical guidelines, diagnostic criteria, research, insurance policies, and public health initiatives.
When language becomes imprecise, thinking can become imprecise. When thinking becomes imprecise, goals become inconsistent. And when goals become inconsistent, entire systems can begin optimizing for different outcomes without recognizing the disagreement.
One clinician prioritizes symptoms. Another prioritizes biomarkers. Another prioritizes diagnostic classification. Another prioritizes physical function, longevity, independence, or perceived quality of life. Each may be pursuing a legitimate goal. But are they all pursuing the same definition of health?
The Definition Problem: What Are We Actually Measuring?
Imagine trying to build a bridge without agreeing on what makes it structurally sound. Imagine engineers debating efficiency while each uses a different measure of success, or pilots debating safe flying without establishing a shared understanding of safety. These professions depend on operational definitions because vague objectives produce inconsistent decisions.
Healthcare is no different. Definitions shape measurement. Measurement shapes diagnosis. Diagnosis shapes treatment. Treatment shapes outcomes. And outcomes shape how healthcare systems distribute resources and evaluate success. This is particularly important when we consider the relationship between health and disease. They are often presented as simple opposites: you are either healthy or unhealthy, sick or well.
But biology rarely fits neatly into such binary categories. A person may have a diagnosed chronic disease yet maintain excellent physical function, meaningful relationships, psychological well-being, and a fulfilling life. Another may have no identifiable disease yet experience persistent fatigue, poor physical conditioning, inadequate sleep, psychological distress, and declining functional capacity.
Who is healthier? The answer depends largely on what we mean by health. This distinction also matters for overdiagnosis and underdiagnosis. Diagnostic thresholds, disease classifications, and clinical definitions determine which individuals are identified as needing treatment and which are considered outside the boundaries of disease.
When definitions become excessively broad, normal biological variation may be unnecessarily medicalized. When definitions become excessively narrow, meaningful dysfunction may go unrecognized. A diagnosis is an important clinical tool, but it is not a complete description of a person. Similarly, a laboratory value is a measurement of a particular biological variable, not an exhaustive measurement of health. Symptoms, biomarkers, diagnostic classifications, and functional assessments all contribute valuable information.
But the map is not the territory.
And a healthcare system that confuses its measurements with the phenomenon it is attempting to understand risks optimizing the map rather than improving the patient.
Looking at Life Instead of Disease
What if our definition of health began not with disease, but with life itself? Every living organism, from microscopic bacteria to blue whales, faces a fundamental challenge: It must continuously respond to changing conditions while preserving the organization and functions necessary to remain alive. The environment changes. Resources fluctuate. Threats emerge. Damage accumulates. Energy availability shifts. Internal physiological conditions are constantly being challenged. Yet living organisms persist. How?
Through adaptation.
Every heartbeat, immune response, postural adjustment, metabolic regulation, memory formation, wound-healing process, and behavioral decision reflects some aspect of life's continuous effort to maintain function under changing circumstances. Organisms detect changes, respond to disturbances, allocate resources, regulate internal conditions, and modify their behavior or physiology in ways that influence survival and future functioning.
Adaptation is not an occasional biological event. It is an ongoing characteristic of living systems. Of course, not every adaptation is beneficial in the long term. A physiological response that protects us during an immediate threat may become harmful when sustained unnecessarily. A compensatory movement pattern may allow someone to function despite an injury while eventually creating additional mechanical stress. An immune response that protects against infection may become destructive when poorly regulated.
Adaptation is necessary for life, but not every adaptive response improves health.
This distinction is crucial. If we understand life as an ongoing process of responding to demands, then perhaps health is best understood in terms of an organism's capacity to adapt successfully. Rather than defining health exclusively through the absence of pathology, we can begin examining the relationship between the demands placed upon an individual and the resources available to meet those demands.
This provides a different organizing principle.
Health as Adaptive Capacity
From this perspective, I propose a working definition:
Health is the capacity to meet life's changing internal and external demands while maintaining meaningful function, supporting well-being, and preserving the ability to adapt in the future.
This definition does not require perfect physiology, unlimited performance, or the complete absence of disease. Instead, it recognizes health as dynamic, contextual, multidimensional, and continuously influenced by the relationship between an individual and their environment. A healthy organism must be capable of responding appropriately to challenges without repeatedly sacrificing the resources necessary for long-term functioning.
Consider two people exposed to the same physical or psychological stressor: One possesses sufficient physiological reserves, appropriate coping strategies, supportive relationships, and opportunities for recovery. The other is already operating under substantial metabolic, psychological, environmental, or social burdens. The external demand may be identical. The consequences may be dramatically different. Why?
Because the relevant question is not simply how much stress exists, but how that stress interacts with the individual's adaptive capacity. This helps explain why the same illness, injury, environment, or lifestyle intervention can produce different outcomes in different people. It also helps clarify an important principle:
Health is not merely a condition we possess. It is a capacity we continuously maintain, practice, and develop.
Physical strength deteriorates when it is no longer challenged. Cardiovascular conditioning declines with prolonged inactivity. Skills become less reliable without practice. Psychological coping strategies require development and reinforcement. Relationships require attention and participation. Not every dimension of health operates like a trainable muscle, and some health limitations cannot be overcome through effort or lifestyle changes alone. Nevertheless, many of the capacities that support healthy functioning can be strengthened, protected, or restored through intentional action.
If we never practice the behaviors and develop the resources that support health, we may discover that those resources are far more difficult to access when illness, injury, aging, or unexpected demands make them essential. Health is something we practice today so that we have greater capacity available when tomorrow demands it.
A Different Vocabulary for Healthcare
When adaptation becomes a central organizing principle, several familiar concepts can be viewed through a more integrated lens.
Life: The continuous process through which an organism maintains its viability and organization while interacting with a changing environment.
Living: The ongoing experience and activity of responding to internal and external conditions.
Health: The capacity to meet changing demands while maintaining meaningful function, supporting well-being, and preserving future adaptive potential.
Disease: A pathological condition involving disturbances in structure or function that may constrain adaptation, threaten well-being, or increase vulnerability.
Resilience: The ability to withstand, respond to, and recover from disturbances while maintaining or regaining meaningful function.
Recovery: The process of restoring or reorganizing physiological, psychological, and functional resources following disruption.
Healing: The biological and experiential processes through which damage, dysfunction, or distress is repaired, resolved, or meaningfully accommodated.
Medicine: The scientific and clinical discipline devoted to understanding, preventing, diagnosing, and treating disease and other conditions affecting human health.
Healthcare: The coordinated effort to protect health, prevent avoidable harm, treat disease, restore function, reduce unnecessary burdens, and support the capacities required for meaningful living.
These are not intended to replace every established medical definition or erase important distinctions between disease, disability, symptoms, and health. Rather, they demonstrate how adaptive capacity can provide a unifying conceptual framework.
A person with a permanent disability, for example, may still achieve substantial health, resilience, autonomy, and well-being through appropriate accommodations, treatment, social support, and adaptation. Likewise, the presence of disease does not necessarily eliminate a person's capacity to live a meaningful or healthy life. The objective is not to reduce every dimension of human experience to biology. It is to recognize that health emerges from the ongoing interaction of biological, psychological, ecological, and social systems.
The Clinical Question Changes
“Efficiency is doing the thing right. Effectiveness is doing the right thing.” Peter Drucker
Once adaptive capacity becomes part of our understanding of health, the questions we ask in healthcare begin to change.
Instead of asking only: What disease does this person have?
We also ask: What demands are exceeding this person's current capacity, and why?
Instead of asking only: What symptom should we eliminate?
We also ask: What processes are producing, amplifying, or perpetuating this symptom, and which are modifiable?
Instead of asking only: Which medication is indicated for this diagnosis?
We also ask: What combination of appropriate medical treatment, burden reduction, functional restoration, and capacity development will best improve this person's health?
These questions are complementary, not mutually exclusive. Sometimes the most important intervention is a medication. Sometimes it is surgery. Sometimes it is rehabilitation, improved nutrition, adequate sleep, psychotherapy, occupational modification, social support, or removing a harmful environmental exposure. Frequently, effective healthcare requires a thoughtful combination.
The goal is not to abandon disease-focused medicine. Accurate diagnosis and appropriate treatment remain essential, particularly when serious pathology is present. The goal is to avoid mistaking disease management for the entirety of healthcare. A diagnosis tells us something important about what may be wrong. It does not, by itself, tell us everything necessary to help someone function, recover, adapt, or thrive.
The Adaptive Capacity Framework: Three Fundamental Questions
This brings us to the central premise of the Adaptive Capacity Framework.
Every individual exists within a continuously changing relationship between the demands placed upon them and the capacities available to respond. Those demands may be biological, psychological, ecological, or social. They may arise from disease, injury, inadequate nutrition, poor sleep, environmental exposures, occupational pressures, interpersonal conflict, financial insecurity, or countless other sources. Likewise, adaptive capacity is influenced by physiological reserves, cognitive and emotional resources, learned skills, social relationships, environmental conditions, access to care, and opportunities for recovery.
Health cannot be reduced to a simple numerical difference between demand and capacity. However, examining their relationship provides a useful framework for identifying where interventions may be most effective. Within this framework, meaningful interventions can be organized around three fundamental questions:
1. What burdens can we reduce?
Identify and address unnecessary or excessive demands that consume resources, impair function, or increase vulnerability. These might include unresolved medical conditions, harmful exposures, inadequate recovery, persistent psychological stressors, nutritional deficiencies, or modifiable environmental and social barriers. The objective is not to eliminate every challenge. Some challenges are essential for growth and adaptation. It is to distinguish between demands that serve a constructive purpose and those that unnecessarily overwhelm the individual.
2. What functions can we restore?
Identify systems, processes, or abilities that have become impaired and determine whether their function can be improved. This may involve treating disease, rehabilitating injured tissues, addressing neurological dysfunction, improving metabolic regulation, restoring mobility, supporting psychological recovery, or resolving barriers to everyday activities. When full restoration is not possible, rehabilitation may instead focus on compensation, accommodation, and preserving independence. The objective is to recover or reorganize meaningful function wherever possible.
3. What capacities can we build?
Identify opportunities to develop the physiological, psychological, behavioral, and social resources needed to meet future demands more effectively. This might involve improving muscular strength, cardiovascular fitness, metabolic flexibility, movement competency, coping skills, health literacy, recovery habits, or the availability of supportive relationships. Where burden reduction and functional restoration address existing limitations, capacity development also considers future resilience and opportunity. Together, these questions create a practical progression:
Reduce unnecessary burdens. Restore impaired function. Build future capacity.
They can be applied across nutrition, exercise, rehabilitation, psychology, immunology, endocrinology, neurology, preventive medicine, and public health. They also extend beyond healthcare into education, leadership, parenting, and organizational development. Not because all these fields are identical, but because each must contend with a fundamental reality: systems function within constraints, encounter changing demands, and depend on their ability to respond effectively.
The Danger of Confusing the Model With Reality
We should remain cautious, however, about replacing one narrow definition with another. The statistician George Box famously observed that all models are wrong, but some are useful. His insight is especially relevant to healthcare. A model is not reality. It is a simplified representation designed to help us understand, predict, or act upon some aspect of reality.
Disease classifications are models. Laboratory reference ranges are models. Psychological frameworks are models. Even the Adaptive Capacity Framework is a model. Its value should not be judged by how elegant or comprehensive it sounds, but by whether it improves understanding, clinical reasoning, decision-making, and patient outcomes.
A useful model should clarify complexity without pretending to eliminate it. It should generate better questions rather than merely supply more sophisticated terminology. And it should remain open to revision when evidence demonstrates that a different explanation or intervention is more effective. This is an important distinction between using language to illuminate reality and using language to create the appearance of understanding.
An elaborate explanation is not necessarily an accurate one. A complicated treatment is not necessarily a better one. And a sophisticated measurement is not necessarily a meaningful outcome. We should measure what matters, but also continually question whether what we are measuring actually represents the health outcomes we intend to improve.
From Healthcare as a Service to Health as a Practice
“You say you want a revolution…” The Beatles
Perhaps one of the greatest consequences of redefining health is that it changes our understanding of the patient's role. Modern healthcare is often organized around encounters. A person develops symptoms, schedules an appointment, receives an evaluation, obtains a diagnosis, and begins treatment. That system is indispensable for many medical needs, but it captures only a small portion of the processes that influence health. Health is shaped continuously, not exclusively during medical appointments. It is influenced by how we eat, move, sleep, think, recover, connect with others, respond to challenges, and interact with our environments. It is also influenced by circumstances outside our immediate control, including genetics, disease processes, social conditions, and access to essential resources.
This is why effective healthcare must involve more than simply telling patients to eat better, exercise more, sleep adequately, or manage stress. People need the knowledge, skills, opportunities, resources, and appropriate support to translate recommendations into sustainable action. The clinician's role therefore extends beyond identifying pathology and prescribing interventions. It also involves helping patients understand their health, navigate uncertainty, make informed decisions, develop practical skills, and participate meaningfully in their own care.
Healthcare is something professionals help provide. Health is something individuals and communities must be supported in sustaining.
This does not mean every illness is preventable, every impairment reversible, or every outcome within personal control. It means that wherever meaningful opportunities exist, healthcare should help people develop the resources and capabilities needed to live well, not merely survive until their next medical encounter.
Before We Transform Healthcare, We Must Understand Health
Wittgenstein's philosophical legacy offers a useful reminder that the limits and ambiguities of language can shape the problems we believe we are solving. If we cannot clearly articulate our objectives, we should not be surprised when our systems pursue inconsistent measures of success. If we define health only through the absence of disease, we risk overlooking function, resilience, well-being, and future capacity. If we define it only through happiness or subjective experience, we risk overlooking serious pathology. If we define it only through biological measurements, we risk reducing a human life to a collection of numbers.
And if we define it exclusively through idealized standards of performance or perfection, we risk turning health into an unattainable destination rather than a meaningful, ongoing process.
A more useful understanding must account for the person, the environment, the demands of life, and the capacities available to meet those demands. It must recognize that the same individual can experience health and illness simultaneously across different dimensions. It must allow for recovery, compensation, growth, aging, and changing circumstances. Most importantly, it must help us make better decisions.
Because the purpose of defining health is not simply to win a philosophical argument.
It is to establish a clearer destination for the science, practice, and future of healthcare.
And perhaps the most important shift begins by asking a different question.
Not merely: What does a healthy person look like?
But: What allows a person to remain functional, resilient, and capable of living meaningfully across changing circumstances - and how can we protect, restore, and develop that capacity?
That is the question at the heart of our Adaptive Capacity Framework.
And it may be a more useful place to begin. Health is not simply the absence of what makes us sick. It is the presence, preservation, and development of what allows us to live well.
Legend has it that when Ludwig Wittgenstein defended his Tractatus Logico-Philosophicus at Cambridge in 1929, his doctoral examination took an unusual turn. Facing two of the twentieth century's most distinguished philosophers, Bertrand Russell, his former mentor, and G. E. Moore, Wittgenstein reportedly concluded the examination by patting his examiners on the shoulders and reassuring them, "Don't worry, I know you'll never understand it."
Whether the exchange unfolded exactly as the story suggests is less important than what the anecdote illustrates: the extraordinary difficulty of communicating complex ideas, even among brilliant minds who share a common intellectual language. There is something wonderfully ironic about a philosopher devoted to examining the relationship between language, logic, and meaning acknowledging that even his own examiners might struggle to understand what he was trying to communicate.
And perhaps there is a lesson here for healthcare.
If some of the greatest philosophers of their generation could struggle to arrive at a shared understanding of meaning, what makes us so confident that physicians, patients, researchers, policymakers, and insurers all mean the same thing when they use the word health?