Health is not just the absence of disease, but the presence of total wellbeing. For too long, conversations around public health have been driven by numbers like life expectancy, survival rates, and years lived with disease. While these metrics are essential, they often miss a critical element, the quality of those years. Longevity does not reflect better living. With the ever-evolving understanding of human health, there is a growing need for more comprehensive measures of health outcomes. This is where the concept of Wellbeing-Adjusted Life Years (WALY) becomes crucial.[1] WALY is a novel measure aimed at quantifying the effect of health interventions, diseases, or policies on overall human wellbeing, instead of focusing solely on health or longevity.[2, 3]

WALY seeks to address limitations in conventional measures, like QALY and DALY, which mainly focus on disease burden and functional impairment, often failing to capture the complete range of subjective wellbeing,[2] as it takes into consideration the overall lived experience, including happiness, emotional strength, connection, and a sense of purpose.[1, 2] With WALY, the focus shifts from merely counting years to evaluating how meaningfully and comfortably those years are lived. The incorporation of physical, mental, emotional, and social wellbeing into the health metrics offers a more humane and complete understanding of truly being healthy.[1]

WALY is usually calculated using validated subjective wellbeing scales, such as the Warwick-Edinburgh Mental Wellbeing Scale (WEMWBS), which evaluates different aspects of wellbeing (such as pleasure, happiness, meaning, and purpose).[2] Supported by self-reported experiences, WALY signifies the refinements of individual health more accurately than surrogate indicators. This way, WALY aligns the assessment of emotional, psychological, and social wellbeing elements with that of physical health.[1, 2]

This shift in perspective is important as it reinvents the role of healthcare. A WALY-centred approach encourages healthcare systems to focus on overall wellbeing rather than only treating the disease and prolonging life at all costs. This approach also underscores the significance of connectedness measures, mental health services, social interventions, and community-building programs that might prolong the results in survival statistics, but profoundly improve everyday life.[1, 2]

WALY has a widespread practical impact as it facilitates comparison of the efficacy of interventions across different domains, including healthcare, social welfare, and environmental policy, by translating wellbeing outcomes into a common unit. When wellbeing becomes a key metric, investments in mental health, social infrastructure, elderly care, and proactive health gain priority and validity. This is particularly important among aging populations, where the goal is beyond simply living longer as it focuses on enabling those additional years to be filled with dignity, self-sufficiency, and joy.[1, 3] Therefore, WALY is especially valuable for decision-makers, as it informs resource allocation through a wellbeing-centred perspective.[4] By merging costs and benefits into a single, integrated framework, WALY supports the evaluation of “happiness return on investment,” highlighting interventions that maximize societal prosperity.[1]

With the specific ability to encapsulate the lived experience of individuals, WALY brings into focus areas typically understated in health economics, such as mental health, social connection, and community strength. Evidence on WALY has shown that conditions like depression and anxiety can lead to greater wellbeing losses than many physical diseases, a detail often overlooked by traditional metrics.[2-4] In this sense, WALY prioritizes psychological and emotional wellness during health assessments, promoting the development of cohesive care models catering to both mind and body. Therefore, healthcare providers are encouraged to prioritize the patients’ lived experience, their comfort, happiness, and ability to participate meaningfully in life, rather than only focusing on clinical outcomes.[1, 3]

In conclusion, WALY signifies a pivotal advancement in measuring the true impact of interventions on human health and wellbeing. By focusing on subjective wellbeing, it provides a more inclusive and human-centred approach to assessing societal progress and informing policy decisions, a reminder that true healthcare success lies not only in how long we live, but in how well we live.

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References

1. Birkjær M, Kaats M, Rubio A. Wellbeing Adjusted Life Year Berlin: Leaps by Bayer; 2020 [cited 2025 28th April]. Available from: https://leaps.bayer.com/happiness_research_institute_short-report.pdf.
2. Johnson R, Jenkinson D, Stinton C, Taylor-Phillips S, Madan J, Stewart-Brown S, et al. Where’s WALY? : A proof of concept study of the ‘wellbeing adjusted life year’ using secondary analysis of cross-sectional survey data. Health Qual Life Outcomes. 2016;14(1):126.
3. Dizon RJR. Enhancing People’s Subjective Wellbeing: Assessing the Impact of Universal Health Coverage Through Wellbeing Adjusted Life Years. Forum for Social Economics. 2024;53(4):459-86.
4. Brinkmann C, Stargardt T, Brouwer WBF. From Health to Well-Being: Toward a Monetary Valuation of a Well-Being-Adjusted Life-Year. Value in Health. 2024;27(7):857-70.