# Swooni Relationship Fitness Index Edition: July 2026 Last reviewed: 20 July 2026 Next scheduled review: August 2026 All cited sources were rechecked on 20 July 2026. No displayed figure, interpretation, or limitation changed. ## Citation Swooni. (2026). Swooni Relationship Fitness Index (July 2026; reviewed 20 July 2026). https://swooni.io/relationship-fitness-index When citing an individual figure, cite its original source alongside the Swooni Relationship Fitness Index. ## Interpretation The evidence signals provide context for why relationship fitness matters. They are not combined into a person-level, couple-level, clinical, or diagnostic score. ## Evidence signals ### 1 in 6: People globally reporting loneliness The WHO estimates that 15.8% of people globally reported loneliness between 2014 and 2023. - Population scope: Global estimates across 153 countries and territories, using observations from 2014 to 2023. - Uncertainty or context: The 15.8% estimate has a 95% uncertainty interval of 12.8% to 20.1%. - Limitation: This is a global loneliness estimate, not a measure of romantic relationship quality or Swooni members. - Evidence: World Health Organization, Chapter 2, section 2.2, Figure 2 - Source: https://iris.who.int/bitstream/handle/10665/381746/9789240112360-eng.pdf ### +29%: Higher heart-disease risk associated with poor social relationships A synthesis cited by the U.S. Surgeon General associated poor social relationships with a 29% increase in heart-disease risk. - Population scope: A synthesis of 16 independent longitudinal studies covering multiple forms of social relationship quality and quantity. - Uncertainty or context: The reported figure is a pooled association. It is not evidence that poor social relationships directly cause heart disease. - Limitation: This is an association across social-connection research and does not establish that one relationship habit causes a health outcome. - Evidence: U.S. Department of Health and Human Services, Chapter 2, Cardiovascular Disease, page 26 - Source: https://www.hhs.gov/sites/default/files/surgeon-general-social-connection-advisory.pdf ### +32%: Higher stroke risk associated with poor social relationships The same synthesis associated poor social relationships with a 32% increase in stroke risk. - Population scope: A synthesis of 16 independent longitudinal studies covering multiple forms of social relationship quality and quantity. - Uncertainty or context: The reported figure is a pooled association. It is not an individual risk prediction or proof of causation. - Limitation: This is a population-level association, not a prediction or clinical assessment for an individual or couple. - Evidence: U.S. Department of Health and Human Services, Chapter 2, Cardiovascular Disease, page 26 - Source: https://www.hhs.gov/sites/default/files/surgeon-general-social-connection-advisory.pdf ### 87 years: Years in the Harvard adult-development study The Harvard Study of Adult Development began in 1938 and continues to examine relationships, health, and happiness across generations. - Population scope: A longitudinal study that began with 724 participants and later expanded to include wives and descendants. - Uncertainty or context: The displayed value describes the study's duration. It is not a statistical effect estimate. - Limitation: Its original cohorts were not globally representative; the value here describes study duration, not an effect size. - Evidence: Harvard Study of Adult Development, Introduction, the paragraph identifying the study's 87th year - Source: https://news.harvard.edu/gazette/story/2025/05/things-money-cant-buy-like-happiness-and-better-health/ ### 5:1: Positive-to-negative interactions during conflict The Gottman Institute describes five or more positive interactions for every negative interaction during conflict in stable, happy relationships. - Population scope: Couples observed during conflict in longitudinal relationship research described by the Gottman Institute. - Uncertainty or context: The 5:1 benchmark applies to interactions during conflict and should not be generalized into a clinical diagnosis. - Limitation: The ratio is a research-informed benchmark, not a diagnostic threshold or guarantee for a particular relationship. - Evidence: The Gottman Institute, The section beginning 'That magic ratio is 5 to 1' - Source: https://www.gottman.com/blog/the-magic-relationship-ratio-according-science/ ## Methodology Purpose: Provide a small, auditable public-evidence baseline for explaining why relationship fitness matters. Unit of analysis: Published evidence signals. The Index does not score, rank, or diagnose a person or couple. ### Included - A primary or authoritative public source is available without private access. - The displayed claim can be located directly in the cited source. - The evidence is relevant to social connection, relationship patterns, or relational wellbeing. - The figure can be explained with its population scope, context, and limitation. ### Excluded - Swooni member data, inferred member attributes, testimonials, or internal product analytics. - SEO-tool estimates, vendor claims, or statistics without a retrievable original source. - Unsupported causal, clinical, diagnostic, or person-level conclusions. - A combined score that would imply more precision than the evidence supports. ### Monthly review protocol - Reopen every cited source and verify the displayed figure, evidence locator, scope, and limitation. - Search for newly published primary or authoritative evidence that materially changes the baseline. - Synchronize the HTML report, JSON, CSV, Markdown, press references, sitemap metadata, and regression checks. - Record both substantive changes and source reviews that produce no substantive change. ### External review and corrections Status: Not externally peer reviewed. This is a Swooni editorial evidence baseline, not an academic systematic review or validated clinical instrument. Corrections: Material corrections are dated in the edition history. Figures, interpretations, and limitations are not silently changed. Suggest a correction at https://swooni.io/contact-us. ## Data policy This edition contains public research only. It contains no private, individual, inferred, or anonymized Swooni member data. ## Sources - World Health Organization. From loneliness to social connection: charting a path to healthier societies. Chapter 2, section 2.2, Figure 2. https://iris.who.int/bitstream/handle/10665/381746/9789240112360-eng.pdf - U.S. Department of Health and Human Services. Our Epidemic of Loneliness and Isolation. Chapter 2, Cardiovascular Disease, page 26. https://www.hhs.gov/sites/default/files/surgeon-general-social-connection-advisory.pdf - Harvard Study of Adult Development. Things money cannot buy — like happiness and better health. Introduction, the paragraph identifying the study's 87th year. https://news.harvard.edu/gazette/story/2025/05/things-money-cant-buy-like-happiness-and-better-health/ - The Gottman Institute. The Magic Relationship Ratio, According to Science. The section beginning 'That magic ratio is 5 to 1'. https://www.gottman.com/blog/the-magic-relationship-ratio-according-science/