Public health advances have extended longevity, yet longer lives are increasingly accompanied by longer periods spent in poor health. Average time lived with illness increased from about 8.7 years in 2000 to 10.2 years in 2025 and is projected to reach 11.4 years by 2050. Ageing populations and rising prevalence of noncommunicable diseases including cardiovascular disease, diabetes, cancer and mental health conditions mean more people will manage chronic illness for longer. Fiscal pressures are intensifying. In almost 62 countries, debt servicing exceeds healthcare spending, limiting capacity to invest in health systems and prevention. Official development assistance fell by 9 percent in 2024, with 2025 levels estimated to be the lowest in more than 15 years. Scaling timely access to proven, cost-effective interventions could improve health outcomes and economic performance within these constraints.
Demographic Shifts and Growing System Strain
The world’s population is projected to grow from 8.1 billion in 2025 to 9.3 billion by 2050, while the number of people over 65 is projected to nearly double from 862.0 million to 1.6 billion. Between 2025 and 2050, total global disease burden is expected to rise by 19 percent, driven largely by years lived in poor health. After declining by approximately 24 percent over the past 25 years, global disease burden per capita is projected to increase by about 4 percent over the next 25 years.
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Healthcare spending is projected to increase from $11.2 trillion (€9.6 trillion) today to $20.5 trillion (€17.5 trillion) by 2050, rising from 10 percent to 11 percent of global GDP. Lost productivity and reduced labour force participation linked to poor health are expected to rise from 17 percent to 23 percent of global GDP. Higher costs combined with reduced workforce participation threaten economic growth.
Scaling timely access to proven, cost-effective interventions could avert 35 percent of total disease burden in 2050, avoid 33 million premature deaths and avert more than 461 million years of poor health annually. This translates into roughly 18 additional healthy days per person each year. Projected health impact is 33 percent in higher-income countries and 38 percent in lower-income countries. Universal access to safe drinking water could save an estimated three million lives every year.
Prevention as the Core Lever for Impact
Nearly two-thirds of potential health gains would come from prevention, yet most countries spend less than 2 percent of health budgets on preventive care. Health interventions fall into three categories: population-level prevention, individual-level prevention and proactive care, and therapeutic interventions.
Population-level prevention reduces risks through measures that shape environments and behaviours, including air quality controls and tobacco controls. Individual-level prevention and proactive care target personal behaviour change and risk management through measures such as vaccination and smoking cessation support. Therapeutic interventions manage established conditions including cancer and psychiatric disorders.
Population-level and individual-level prevention strategies together could account for 65 percent of potential health gains, while therapeutic interventions contribute the remaining 35 percent. Tobacco control reduces lung cancer incidence and lowers risks of cardiovascular and respiratory conditions. Vaccination protects against multiple infectious diseases. Improved nutrition and physical activity reduce risk of chronic disease. About three-quarters of potential health impact could be achieved by scaling interventions delivered in primary and specialty care, with the remainder achievable through public health measures outside formal health systems.
Economic Value and Implementation Constraints
Improved health supports labour force participation and productivity. Fewer early deaths extend working lives. Effective prevention and management of chronic conditions increase consistent workforce participation and reduce absenteeism. Reduced informal caregiving demand enables more caregivers, the majority of whom are women, to pursue paid employment or education. Reduced presenteeism linked to chronic and mental disorders improves productivity, while early childhood health and nutrition are associated with higher lifetime earnings.
Enhancing global health could generate approximately 288 million additional full-time equivalent work-years by 2050, equivalent to a 4 percent increase in global labour force participation. This expansion could add $12.5 trillion (€10.7 trillion) to global GDP annually by 2050, representing about 7 percent of global output, with about 85 percent of the gain driven by increased participation. Achieving this would require an estimated $3.3 trillion (€2.8 trillion) in annual investment by 2050, around 16 percent of projected global healthcare spending. For every dollar invested in scaling cost-effective interventions, an estimated four dollars in economic benefit could be generated.
Lower-middle-income countries are projected to achieve the highest return on investment, at an estimated sixfold return, while low-income countries are projected to show a 1.9-fold return. Primary healthcare investments in Kenya yielded up to $16 (€13.7) in savings per dollar invested. In the United Kingdom, an AI-driven programme reduced admissions by up to 70 percent and saved an estimated $1 billion (€0.86 billion) annually. In Ireland, more than €600 million in health system efficiency savings were identified in 2024, with plans for reinvestment.
Demographic ageing, rising chronic disease prevalence and fiscal constraint are set to increase healthcare demand and deepen the economic toll of poor health by 2050. Scaling access to proven, cost-effective interventions could substantially reduce disease burden, prevent millions of premature deaths and avert extensive years lived in poor health, while increasing healthy life expectancy and generating significant economic value. Prevention accounts for most of the potential health impact despite limited current funding. Aligning incentives towards prevention, enabling multisector collaboration and improving spending efficiency can strengthen both population health and economic resilience.
Source: McKinsey Health Institute
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