Exploring the Multifaceted Definitions of Health, Quality of Life, and Anthropometry

What exactly does it mean to be “healthy”? And how do we measure whether a community is truly thriving? These questions may seem straightforward, but they sit at the heart of some of the most important debates in public health, development economics, and child welfare. Three interconnected concepts – health, quality of life (QoL), and anthropometry – form the foundation through which researchers, policymakers, and health workers understand and improve human well-being, particularly for women and children in vulnerable communities.

What does “health” really mean?
The three dimensions unpacked
The criticism and what it reveals
Amartya Sen’s view: health as human capability
Health, women, and economic growth
Quality of life: beyond income and survival
The social and economic dimensions of QoL
QoL among the Irula tribes of the Nilgiri hills: a case in point
Anthropometry: measuring health through the body
Key indicators: height-for-age and weight-for-height
Anthropometry, cognition, and educational attainment
Anthropometry as a policy tool
Three concepts, one framework

What does “health” really mean?

Most people think of health simply as the absence of illness. But this narrow understanding has been challenged for decades. The WHO Constitution, which entered into force on 7 April 1948, defined health as a state of complete physical, mental, and social well-being – not merely the absence of disease or infirmity. Crucially, it also declared that the enjoyment of the highest attainable standard of health is one of the fundamental rights of every human being, without distinction of race, religion, political belief, or economic condition.

This definition was deliberately holistic. As scholars publishing in Public Health Ethics have argued, the word “complete” in the WHO definition does not demand a state of perfect well-being – an impossible bar – but rather an exhaustive one: a well-being that encompasses all its constitutive dimensions simultaneously. Health, under this reading, is not a binary state but a spectrum shaped by physical, mental, and social factors working together.

The three dimensions unpacked

Physical health refers to the body’s functional capacity – freedom from disease, adequate nutrition, and the ability to carry out daily activities. Mental health, as WHO further clarifies, is more than the absence of mental disorders. It is a state in which an individual can realize their own abilities, manage the normal stresses of life, work productively, and contribute to their community. Without mental health, there is no health at all. Social well-being refers to the quality of relationships, social support systems, and participation in community life – factors just as determinative of health as any biological marker.

In 1984, WHO revisited the definition and shifted the framing from health as a desired “state of being” to a dynamic set of resources for living – emphasizing social and personal capabilities alongside physical ones. This evolution matters: it recognizes that health is not something you possess but something you actively maintain through interaction with your environment.

The criticism and what it reveals

Critics, as noted in the British Journal of General Practice, point out that the WHO’s totalizing standard renders virtually all humans “unhealthy” by definition – since perfect physical, mental, and social well-being is unattainable for most people, especially those living with chronic illness or disability. The result, they argue, is a framework that inadvertently pathologizes ordinary human existence. Yet even critics acknowledge the definition’s political and aspirational value: it insists that health is a right, not a privilege, and that social conditions are inseparable from physical ones.

Amartya Sen’s view: health as human capability

Nobel Prize-winning economist Amartya Sen offers another critical lens. His Capability Approach, first articulated in the 1980s and expanded in his landmark book Development as Freedom (1999), argues that development should be measured not by economic output alone, but by the real freedoms and capabilities available to individuals – including the freedom to be healthy.

For Sen, health is not simply a personal state; it is a foundational capability that enables all other freedoms. His framework emphasizes that development is not merely about income growth, but about expanding human freedoms – particularly through education and healthcare. Without good health, individuals cannot access education, earn a living, or participate meaningfully in civic life. Poor health, in this sense, is a form of unfreedom.

Health, women, and economic growth

Sen’s capability approach has profound implications for women and children. Sen argues that empowering women is crucial for sustainable development because it leads to better health, education, and economic outcomes for entire communities. His concept of “missing women” – women who would likely be alive had they been born male – draws attention to the deadly consequences of neglect, poor nutrition, and restricted healthcare access for women in developing countries.

As former IMF Managing Director Christine Lagarde noted in a lecture honoring Sen, improving literacy among women leads to better family health and economic outcomes – a chain reaction that connects individual capability to national prosperity. Sen’s own observations about India underscore this point: the absence of broad-based healthcare and education has constrained India’s productive capacity far more than any policy failure in trade or finance. Improving women’s literacy, Sen demonstrated, often leads to better family health and economic outcomes – a multiplier effect that extends well beyond the individual.

Quality of life: beyond income and survival

If health is the foundation, then quality of life (QoL) is the broader structure built on it. The World Health Organization defines QoL as an individual’s perception of their position in life in the context of the culture and value systems in which they live, in relation to their goals, expectations, standards, and concerns. This definition is inherently subjective: it centers on how people experience their own lives, not just how their lives appear from outside.

The Quality of Life Research Unit at the University of Toronto frames QoL as the degree to which a person can enjoy the valued possibilities of their lives. This framing is important – it introduces agency and value into the equation. QoL is not simply a matter of material conditions but of whether people can actually live in accordance with what matters to them.

QoL encompasses both objective and subjective dimensions. Objectively, it includes access to clean water, nutrition, healthcare, education, employment, and housing – the social and economic outputs that communities receive from institutions and governments. Subjectively, it includes people’s sense of purpose, belonging, mental wellness, cultural continuity, and security.

The “engaged theory” approach, widely cited in QoL literature, breaks QoL into four domains: economics, ecology, politics, and culture. This multi-domain model recognizes that a rise in income alone does not guarantee a better life – a person can be materially better off but culturally displaced, politically powerless, or environmentally threatened. All four domains must be addressed together.

QoL among the Irula tribes of the Nilgiri hills: a case in point

The Irula tribes of Tamil Nadu’s Nilgiri Hills provide a striking real-world illustration of how health and quality of life intersect in indigenous communities. Research published in Current Science (2021) on the Irulas of the Nilgiri Biosphere Reserve found that physical and mental health, land security, and social cohesion are all key factors shaping community well-being – and that standard measures like the Human Development Index (HDI) fail to capture the holistic condition of such communities.

Studies on health and living conditions among Irula communities in Tamil Nadu reveal that challenges such as unemployment, inadequate healthcare, poor access to education for children, and social stigmatization significantly depress their quality of life – even when basic survival needs are nominally met. The Irula case demonstrates that QoL cannot be assessed through economic metrics alone; cultural identity, access to traditional lands, and community solidarity are equally decisive factors.

Research on maternal health among Irula communities in Tamil Nadu further confirms that better-off households socially and economically tend to produce healthier individuals – and that healthier individuals are more economically productive. Health and economic status thus reinforce each other in a cycle that either lifts communities up or pulls them deeper into poverty. Addressing QoL in such populations requires simultaneous interventions in nutrition, education, healthcare access, and social inclusion.

Anthropometry: measuring health through the body

While the WHO definition and Sen’s capability framework offer conceptual tools for understanding health, practical measurement remains essential – especially for children, whose growth trajectories reveal the quality of their nutrition and care. This is where anthropometry becomes indispensable.

According to the National Institutes of Health, anthropometric measurements are non-invasive quantitative assessments of the human body. In children, they are the gold standard for evaluating general health status, nutritional adequacy, and developmental progress. The core elements include height, weight, head circumference, body mass index (BMI), and mid-upper arm circumference (MUAC).

Key indicators: height-for-age and weight-for-height

The most commonly used anthropometric indicators in child health are:

Height-for-age (HFA) measures a child’s height relative to their age and sex. A child with a low height-for-age – a z-score below two standard deviations of the reference population – is classified as “stunted,” reflecting chronic undernutrition accumulated over time, often rooted in the first 1,000 days of life. Stunting is not merely a growth problem; it is a developmental crisis. Research links chronic stunting to impaired cognitive and motor development and lower school achievement – outcomes that can persist across a lifetime and even across generations.

Weight-for-height (WFH), or Body Mass Index (BMI), assesses whether a child’s weight is appropriate relative to their height, making it an indicator of acute nutritional status. WHO’s Anthro Survey Analyser offers analysis across four key indices – length/height-for-age, weight-for-age, weight-for-length/height, and BMI-for-age – giving health workers a comprehensive picture of a child’s nutritional condition.

Anthropometry, cognition, and educational attainment

The consequences of poor anthropometric status extend well beyond physical size. A substantial body of evidence, reviewed by the Food and Agriculture Organization (FAO), shows that poor growth in schoolchildren is associated with impaired development, and multiple studies have demonstrated a relationship between growth status and school performance and cognitive outcomes. The period from birth to two years of age is recognized as the critical developmental window – nutrition during this period has a substantial influence on long-term health and cognitive capacity.

This matters enormously for girls and women. When girls are stunted in childhood, their cognitive development is compromised, their educational attainment suffers, and their future economic productivity is diminished – feeding directly back into the cycle of poverty and poor maternal health that perpetuates malnutrition in the next generation. Addressing children’s anthropometric status is therefore not just a health intervention; it is an investment in education, gender equity, and economic development simultaneously.

Anthropometry as a policy tool

In public health settings, anthropometric screening is used to identify “at risk” individuals, compare malnutrition prevalence across populations, target nutritional interventions, and assess their impact over time. These measurements are especially critical in tribal and marginalized communities – like the Irulas of the Nilgiris – where access to formal healthcare is limited and nutritional vulnerability is high. By systematically tracking height-for-age and weight-for-height at the community level, governments and NGOs can deploy resources more accurately and evaluate whether interventions are actually improving children’s lives.

Three concepts, one framework

Health, quality of life, and anthropometry are not isolated concepts. They form an integrated framework for understanding human well-being. The WHO’s definition establishes health as a multidimensional right. Sen’s capability approach situates health within the broader struggle for human freedom and development. QoL frameworks capture the lived experience of individuals and communities within their specific social and cultural contexts. And anthropometry provides the empirical, measurable data that grounds all of these concepts in biological reality.

Together, these three lenses are particularly powerful when applied to women and children – the groups whose health status most reliably predicts the long-term trajectory of entire communities. A malnourished child is not just an individual in distress; they are a signal that the community’s social, economic, and environmental conditions need urgent attention. And a woman denied access to healthcare is not just one person suffering – she is an unrealized capability that diminishes the possibilities of everyone around her.

What do you think? If the WHO’s definition of health includes social well-being as a core component, why do most national health budgets overwhelmingly prioritize biomedical interventions over social ones? And given what anthropometry reveals about the link between early childhood nutrition and cognitive development, what specific policy changes would make the greatest difference for children in marginalized communities like the Irulas of the Nilgiri Hills?

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Table of Contents

What does “health” really mean? 🔗

The three dimensions unpacked 🔗

The criticism and what it reveals 🔗

Amartya Sen’s view: health as human capability 🔗

Health, women, and economic growth 🔗

Quality of life: beyond income and survival 🔗

The social and economic dimensions of QoL 🔗

QoL among the Irula tribes of the Nilgiri hills: a case in point 🔗

Anthropometry: measuring health through the body 🔗

Key indicators: height-for-age and weight-for-height 🔗

Anthropometry, cognition, and educational attainment 🔗

Anthropometry as a policy tool 🔗

Three concepts, one framework 🔗