Health and Development: Exploring Their Interconnectedness

Health is far more than the absence of illness – it is the foundation upon which individuals build their lives and nations build their economies. The way a society defines and protects health directly shapes its development trajectory, influencing everything from worker productivity to household income to long-term poverty reduction. Understanding this two-way relationship between health and development is essential for anyone interested in how populations grow, suffer, or thrive.

Defining health: a holistic view
Why the WHO definition still matters
Health and economic development
Insights from Szirmai’s framework
Evidence from the Gallup World Poll
Productivity gains from better health
The vicious cycle of poor health and low income
How illness reduces income
Catastrophic health expenditure and impoverishment
Hardship financing and its aftereffects
Breaking the cycle: why health investments matter
Health as both means and end of development

Defining health: a holistic view

The most widely accepted definition of health comes from the World Health Organization, framed in 1948. According to the WHO Constitution, health is a state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity. This definition was revolutionary at the time because it moved beyond the narrow biomedical view, which equated health only with the absence of clinical illness.

Three dimensions sit at the core of this definition. Physical well-being refers to the proper functioning of the body, including nutrition, fitness, and freedom from disease. Mental well-being covers cognitive and emotional health – the ability to cope with stress, work productively, and contribute to one’s community. Social well-being reflects the quality of relationships, social inclusion, and the ability to participate meaningfully in society.

Why the WHO definition still matters

Some scholars have criticised the WHO definition for being too broad or idealistic. A recent philosophical analysis argues that the word “complete” in the definition was never meant to imply perfect health, but rather an exhaustive view that includes all the essential features of well-being. This holistic interpretation remains highly relevant for public health policy, especially in countries where mental and social dimensions are often neglected in favour of purely medical interventions.

The WHO further clarifies that there is no health without mental health, and that health is influenced by socioeconomic, biological, and environmental factors. This reinforces the idea that health cannot be separated from the broader development context in which people live.

Health and economic development

The relationship between health and economic development is bidirectional. Better health raises productivity and incomes, while higher incomes enable better healthcare, nutrition, and living conditions. This virtuous cycle has been documented extensively in development economics over the past two decades.

Insights from Szirmai’s framework

Economist Adam Szirmai, in his influential textbook The Dynamics of Socio-Economic Development, treats health and education as central to what he calls “productive capacity” – the long-run ability of a society to generate goods, services, and welfare. According to Szirmai’s analytical approach, health is both an independent goal of development and a key input into economic growth. Improvements in nutrition, life expectancy, and disease control expand the productive capacity of a nation by ensuring that workers can contribute consistently across their lifetimes.

Szirmai emphasises that health, disease, mortality, and life expectancy are not just outcomes of development but active drivers of it. Countries that invest in primary healthcare, immunisation, and maternal care tend to see compounding returns over decades, as healthier children grow into more productive adults who in turn raise healthier families.

Evidence from the Gallup World Poll

One of the most cited studies linking health, income, and well-being globally is Angus Deaton’s analysis of the Gallup World Poll. Surveying adults across 132 countries, Deaton’s 2008 study found that average life satisfaction is strongly related to per capita national income, and that high-income countries consistently report greater life satisfaction than low-income ones. Each doubling of income corresponded to roughly a one-point increase on a ten-point satisfaction scale, and the effect held across the full range of international incomes.

This finding matters because it shows that economic development is not just about GDP figures – it translates into measurable improvements in how people perceive their lives, including their health. Health satisfaction and income satisfaction reinforce each other, suggesting that policymakers cannot meaningfully separate economic strategies from health strategies.

Productivity gains from better health

More recent macroeconomic research strengthens this connection. A study by researchers at Harvard’s Center for International Development found that a 10-percentage-point increase in adult survival rates raises labour productivity by about 10.6%, a figure consistent with micro-level evidence on wages and worker output. The same review concluded that health improvements through vaccination, maternal care, and infectious disease control deliver predictable productivity gains.

For developing economies, this is significant. Disease-related absenteeism, premature mortality, and cognitive impairment from childhood malnutrition all reduce the effective labour supply. Conversely, healthier populations produce more, save more, and invest more in their children’s education – creating long-term gains that compound across generations.

The vicious cycle of poor health and low income

While good health fuels prosperity, poor health drags people deeper into poverty. This is often called the “health-poverty trap” – a self-reinforcing cycle where illness leads to lost earnings, lost earnings lead to undernutrition and unaffordable care, and undernutrition leads to further illness.

How illness reduces income

When a worker falls ill, the immediate effect is a loss of working days. For daily-wage earners, agricultural labourers, and informal sector workers – who together form the majority of the workforce in countries like ours – even a few days of lost work can mean missed rent, unpaid school fees, or skipped meals. Chronic illnesses make this worse, as they reduce the ability to work consistently over months or years.

Beyond lost wages, treatment costs eat into household savings. In our country, out-of-pocket health spending accounts for about 47% of total health expenditure, one of the highest shares in the world. This means most healthcare costs are borne directly by families rather than pooled through insurance or government funding.

Catastrophic health expenditure and impoverishment

The financial impact of illness is staggering. According to a comprehensive examination of out-of-pocket expenditure published in Health Policy and Planning, healthcare payments push approximately 32 to 39 million people below the poverty line every year. Another systematic review notes that healthcare spending for around 90 million people has crossed the “catastrophic” threshold, where medical bills exceed 10% of household consumption and threaten the family’s ability to meet basic needs.

A NITI Aayog assessment quoted in one report estimated that around 7% of the population – roughly 10 crore people – is pushed into poverty each year due to healthcare expenses. The proverb that a family is just one serious illness away from poverty is statistically accurate.

Hardship financing and its aftereffects

When families face large medical bills, they often resort to “hardship financing” – borrowing money at high interest, selling productive assets like land or livestock, or pulling children out of school to work. A qualitative study from Kerala documented that households typically begin with borrowing and progress to selling assets as poverty deepens. The aftereffects include reduced household consumption, foregone medical care for other family members, and long-term inability to recover financially.

This is precisely the vicious cycle that Szirmai and other development economists describe. Illness reduces work capacity, which reduces income, which reduces the ability to afford nutritious food and healthcare, which in turn makes future illness more likely. Without external intervention – through public healthcare, insurance, or social safety nets – families can remain trapped for generations.

Breaking the cycle: why health investments matter

Recognising this trap, policymakers around the world have pushed for greater public investment in health. Schemes like Ayushman Bharat-Pradhan Mantri Jan Arogya Yojana, the world’s largest government-funded health insurance programme, aim to reduce the impoverishing effect of hospitalisation costs on poor households. However, research shows that outpatient care – which is not fully covered under such schemes – contributes nearly four times more to health-related impoverishment than inpatient care, highlighting where future policy attention is most needed.

Beyond insurance, primary healthcare, sanitation, clean drinking water, immunisation, and maternal and child health services all help prevent the conditions that lead to the vicious cycle in the first place. When these systems work well, fewer families face catastrophic medical bills, more children grow up healthy and educated, and the workforce becomes more productive – feeding back into economic development.

Health as both means and end of development

One of the most important insights from this field is that health is not merely a tool for economic growth – it is an end in itself. People value being healthy regardless of whether it raises their incomes. At the same time, health investments do produce measurable economic returns, making them one of the most efficient uses of public resources. This dual role – health as both a means and an end – places it at the centre of any serious development agenda.

The interconnection between health and development also explains why purely economic strategies tend to fail in the absence of health improvements. A country can grow its GDP for a decade and still see large sections of its population trapped in poverty if illness continues to consume their earnings. Conversely, countries that have prioritised universal primary healthcare have often seen broad-based improvements in income, education, and social mobility.

What do you think? If you had to choose between expanding public hospitals and strengthening primary healthcare at the community level, which would you prioritise for breaking the health-poverty cycle? And how do you think the social dimension of health – relationships, inclusion, dignity – should be measured in development indicators?

References

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Health and Development: Exploring Their Interconnectedness

Table of Contents

Defining health: a holistic view 🔗

Why the WHO definition still matters 🔗

Health and economic development 🔗

Insights from Szirmai’s framework 🔗

Evidence from the Gallup World Poll 🔗

Productivity gains from better health 🔗

The vicious cycle of poor health and low income 🔗

How illness reduces income 🔗

Catastrophic health expenditure and impoverishment 🔗

Hardship financing and its aftereffects 🔗

Breaking the cycle: why health investments matter 🔗

Health as both means and end of development 🔗