Fundamental question

How should I live?

The oldest question in philosophy has never had a single answer — but eight decades of longitudinal science now let us separate what reliably produces a life people rate as good from what remains, permanently, a matter of contested value. Both halves matter, and confusing them is the most common mistake.

Overall confidence in the core claim moderate (3/5) — strong convergent evidence on the mechanisms of reported wellbeing; deep, likely permanent disagreement on the normative question, plus real cultural bias in the evidence base

Output 1 · Research synthesis

What the evidence currently says

"How should I live?" bundles two different questions that the literature answers very differently. One is empirical: what conditions reliably produce a life a person will, in retrospect, call good? The other is normative: which kind of good — pleasure, virtue, duty, meaning, justice — ought a person to pursue? Science has made real progress on the first. It cannot, and does not claim to, settle the second.

eudaimonia / hedoniaself-determination theory character strengthsikigaivirtue ethics

Strong / convergent

Relationship quality is the single most consistent predictor found. The Harvard Study of Adult Development — the longest-running study of adult life, tracking the same people since 1938 — finds that the quality of close relationships in midlife predicts physical health, brain health and longevity more accurately than cholesterol, wealth, fame or professional achievement. Its directors distinguish hedonic wellbeing (moment-to-moment pleasure) from eudaimonic wellbeing (a deeper sense of purpose and contentment) and find the eudaimonic form more strongly tied to long-term health.
Self-Determination Theory (SDT) — Deci and Ryan's model of three basic psychological needs, autonomy, competence and relatedness — continues to be confirmed by large-scale meta-analysis. A 2025/2026 multilevel meta-analysis of 192 studies found need-satisfaction reliably mediates the link between supportive conditions and wellbeing across work, education and health domains; SDT-informed health interventions move autonomy satisfaction by g = 0.81 and competence satisfaction by g = 0.63 on average.
Character-strengths use correlates with flourishing. The VIA classification (Peterson & Seligman, 2004), now completed by over 13 million people, treats virtues empirically rather than only philosophically. A 2025 study of 7,407 Mexican university students found that more frequent use of one's signature strengths predicted significantly higher scores on Diener's Human Flourishing Scale — a scale now validated for measurement invariance across more than a dozen countries, most recently Hungary (2025).

A structural, not incidental, gap. Every framework above — SDT, VIA, the Flourishing Scale — was built and predominantly validated on Western, educated, industrialized, rich, democratic (WEIRD) populations. A 2025 commentary on psychology "beyond WEIRD biases" and a 2025 International Journal of Applied Positive Psychology paper both argue the field has drifted into a "science of averages": treating group-level, expert-defined traits as universal prescriptions rather than testing whether they hold, unchanged, outside the populations that produced them.

Going deeper · Two ways of naming the same distinction

Happiness and ikigai are not the same word

The hedonic/eudaimonic split that Western psychology treats as a technical distinction turns out to be a lived, everyday distinction in Japanese — one that arguably sharpens the Western concept rather than merely translating it.

1 · Shiawase — the pleasure register

Shiawase (幸福) is the ordinary Japanese word for happiness: a state of feeling good, closer to Western hedonic wellbeing. It is measured, reported, and rises and falls with circumstance much as Western happiness measures do.

2 · Ikigai — the reason-for-being register

Ikigai (生きがい) — literally something close to "that which makes life worth living" — was first studied systematically among patients with leprosy in Japan, in people whose circumstances made hedonic happiness largely inaccessible but who nonetheless reported a strong sense that life was worth living. Researchers now treat ikigai as Japan's closest cultural analogue to eudaimonic wellbeing, but note it resists exact translation: English renderings ("purpose," "reason for being") consistently flatten a concept that in Japanese-language sources carries additional nuances of quiet meaning and joy embedded in the ordinary, not only in grand purpose. A validated English translation (the Ikigai-9, tested in a UK sample) confirmed the construct travels — but longitudinal Japanese studies of older adults still find ikigai predicts health and mortality outcomes independently of, and sometimes more strongly than, measures of hedonic happiness.

This is the kind of finding a purely Anglophone literature review would miss: the hedonic/eudaimonic split is not just a scientific model imposed on experience, it is independently recognisable inside a language that was not built around the Western debate at all — which is modest evidence the distinction tracks something real, not just an artefact of English-language theorising.

Output 2 · Insight generation

What follows if this is true

Reading the evidence together, rather than framework by framework, suggests a reframing of the question itself:

"How should I live" quietly splits into "what am I structurally failing to satisfy right now." If autonomy, competence, relatedness, strengths-use and a sense of purpose are the recurring predictors across independent research traditions, the grand question becomes a maintenance question: which of these conditions is currently unmet, for you, specifically — not which philosophy is correct in the abstract.
Science is confident about inputs, silent about which output matters. The evidence tells you what reliably produces a life people rate as good after the fact. It cannot tell you whether "a life you would rate as good" is the right thing to optimise for, versus duty, justice, or something that costs you exactly that rating. That is a values question, not an empirical one, and no amount of further data closes it.
Some commitments should resist optimisation. The debate between effective altruism's impartial calculus and Bernard Williams' integrity objection (below) suggests that a life fully subordinated to any single optimising principle — even a well-intentioned one — may cost the person their sense that the life is theirs. Protecting some unoptimised personal projects may itself be part of living well.

These are interpretive implications drawn from the framework, not established findings — flagged as such.

Show the work · Contradictions & competing theories

Where it's contested

Does pursuing hedonia produce eudaimonia, or compete with it? Some 2024–2025 studies find hedonic goal pursuit positively predicts eudaimonic wellbeing (mediated by vigor); others find the two orientations trade off depending on which a person prioritises. Findings are inconsistent partly because different studies operationalise "eudaimonia" differently — as a way of functioning in one paper, an experience in another. Unresolved.

Impartial optimisation vs. personal integrity. Effective altruism's utilitarian calculus asks that resources and attention go wherever they do the most measurable good, impartially. Bernard Williams' classic objection — echoed in recent philosophical critiques of effective altruism — is that this demand can alienate a person from the "projects and commitments" that make a life recognisably theirs; ethics, on his view, is too "untidy" to be captured by any single systematised theory. Defenders (e.g. Jeff McMahan) reply that utilitarianism is not a necessary feature of effective altruism and that Williams' objection targets a stricter position than the movement actually holds. Live disagreement.

Universal traits, or person-centred and cultural specificity? VIA character strengths and SDT's three needs are presented as near-universal. Critics argue positive psychology's "top-down," expert-defined trait lists marginalise non-WEIRD and Indigenous conceptions of flourishing, and 2025 proposals call for "bottom-up," idiographic measurement instead of universal prescription. The OECD's 2025 push for "globally inclusive measures of subjective wellbeing" is a direct institutional response to this gap — meaning the field itself now treats its own universality claim as unresolved.

Is the "meaning crisis" a data problem or a cultural one? Cognitive scientist John Vervaeke argues Western societies face a "meaning crisis" — not a lack of information about what predicts wellbeing, but the erosion of communal wisdom practices that historically transmitted how to live. If he is right, the individual-level empirical findings above (however robust) cannot by themselves resolve a problem that is institutional and cultural in origin, and the rapid integration of AI into daily reasoning and decision-making raises the stakes without yet changing the diagnosis.

Through the RFT lens

The same shape, in the project's own terms

In Recursive Field Theory (RFT) terms, a person is an actor Ψ existing in superposition across many constraint fields at once — career, relationships, health, meaning, community — each field with its own activation, coupling and closure. "Living well," read this way, is not the dominance of any one field over the others (echoing RFT's Axiom D1: no field has privileged status by category) but a state where the fields you are actually weighted into reach reasonable closure without any single one running away with the rest. The Harvard finding that relationship quality outpredicts wealth or achievement reads, in this frame, as strong coupling and low entropy in the relational field mattering more than high activation in the status field. Vervaeke's "meaning crisis" reads as sustained high entropy — contested legitimacy — in the meaning field itself, with no field able to close. And the Williams/effective-altruism tension reads as a warning against letting one field's optimisation criterion overwrite the weight matrix that defines every other field an actor is coupled to.

This is David's own interpretive framework, offered as a way of seeing — not an established psychological or philosophical theory, and not a formal extension of the geopolitical or financial engine. It describes a structural analogy, not a validated model of individual flourishing.

Output 3 · Recursive investigation

What to investigate next

Can the recurring predictors (autonomy, competence, relatedness, strengths-use, meaning) be turned into something an individual could actually track and revise over time — what would that instrument need to look like to avoid the WEIRD-bias trap?

Does the shiawase/ikigai distinction map exactly onto hedonic/eudaimonic wellbeing, or does it carry a third dimension that gets lost whenever it is translated into English-language frameworks?

If Western wellbeing science is disproportionately WEIRD-validated, what do Confucian, Ubuntu, or Indigenous relational traditions on "how should I live" contribute that is structurally absent from the Anglophone literature — not just differently worded, but differently shaped?

If Williams is right that ethical life resists systemisation, what does that imply for any attempt — including this project's — to build a computable model of a good life?

Is Vervaeke's "meaning crisis" a new problem created by an accelerating, AI-saturated information environment, or the same old problem of eroded wisdom-transmission now under new pressure?

Sources

Harvard Study of Adult Development — "Over nearly 80 years, Harvard study has been showing how to live a healthy and happy life." Harvard Gazette. news.harvard.edu
Waldinger, R. & Schulz, M. — "Want a Good Life? 3 Lessons from Harvard Grant Study." Six Seconds (2025). 6seconds.org
Hagger, M. & Starr, R. — "Self-Determination Theory and Workplace Outcomes: A Meta-Analysis" (2026). selfdeterminationtheory.org; see also PMC12887546
"Need Support and Need Thwarting: A Meta-Analysis of Autonomy, Competence, and Relatedness Supportive and Thwarting Behaviors in Student Populations." PMC. PMC12276404
Peterson, C. & Seligman, M. — Character Strengths and Virtues: A Handbook and Classification (2004).
"Assessing and nurturing character strengths among children and adolescents." Frontiers in Education (2025). frontiersin.org
Kotera, Y. et al. — "English Translation and Validation of the Ikigai-9 in a UK Sample." researchgate.net
"Exploring the Effects of Ikigai on Mental, Physical, and Social Health: A Scoping Review." Lifestyle Medicine (2025). onlinelibrary.wiley.com
"On the Concept of Well-Being in Japan: Feeling Shiawase as Hedonic Well-Being and Feeling Ikigai as Eudaimonic Well-Being." researchgate.net
"Beyond Universal Prescriptions: Toward A Person-Centered, Bottom-Up Science of Wellbeing." International Journal of Applied Positive Psychology (2025). link.springer.com
"Commentary: Accelerating the science and practice of psychology beyond WEIRD biases: enriching the landscape through Asian psychology." PMC. PMC11445015
OECD — "Globally Inclusive Measures of Subjective Well-Being" (2025). oecd.org
McMahan, J. — "Philosophical Critiques of Effective Altruism." Oxford Research Archive. ora.ox.ac.uk
"Bernard Williams, moral relativism and the culture wars." Aeon Essays. aeon.co
"Bernard Williams." Stanford Encyclopedia of Philosophy. plato.stanford.edu
Schmid, W. — Philosophie der Lebenskunst: Eine Grundlegung (1998); see also "'Lebenskunst' — Schmid's Concept of the Art of Living." pesa.org.au
"The Top 10 Insights from the 'Science of a Meaningful Life' in 2025." Greater Good Magazine, UC Berkeley. greatergood.berkeley.edu
MIT Global Humanities Forum 2025 — "The Good Life: Religions, Philosophies & Sciences." lit.mit.edu
Vervaeke, J. — "Awakening from the Meaning Crisis" series; see also Minter Dial interview (2025). minterdial.com

Primary sources linked where available; books and lecture series cited by title. Always consult the originals — this synthesis describes emphasis and findings, not verbatim claims.

Structured learning · CPD-eligible

Make this count as CPD (≈40 min)

Learning outcomes. After this investigation you should be able to: (1) explain the empirical distinction between hedonic and eudaimonic wellbeing and how each is measured; (2) state Self-Determination Theory's three basic psychological needs and summarise current meta-analytic evidence for their link to wellbeing; (3) articulate the Williams/effective-altruism integrity debate and its relevance to professional judgement; (4) identify at least one WEIRD-bias limitation relevant to the populations you work with.

Format & time. Reflective structured learning · ~30–45 minutes.

To complete the unit:

Read the associated references. Read at least the SDT meta-analysis and the "Beyond Universal Prescriptions" paper in full — linked in Sources above.
Reflect (write 3–5 lines each): Which of the three SDT needs — autonomy, competence, relatedness — is least satisfied in my own life or practice right now, and what would change it? Where do I default to a "universal" wellbeing framework with clients or colleagues from different cultural contexts, and what might I be missing? Where do I feel the tension between optimising for a measurable outcome and protecting someone's — or my own — sense of integrity?
Log it. Record the time spent and these reflections against your professional body's CPD requirements.

CPD-eligible structured learning; not statutory-regulator endorsement — practitioners self-assess relevance and log accordingly.

Our standards. Every investigation is built to be tested, not believed: claims are sourced, strong evidence is kept separate from contested evidence, competing theories and contradictions are shown rather than smoothed over, confidence is stated explicitly, and each piece names what would change its mind — and a human reviews every word before it is published. Reality is the arbiter.