Life's Essential 8
Definition
Life's Essential 8 (LE8) is the American Heart Association's updated construct for measuring and promoting cardiovascular health (CVH), published in 2022 as a revision of the original 2010 Life's Simple 7. It integrates eight health metrics — diet, physical activity, sleep health, nicotine exposure, body mass index, blood pressure, non-HDL cholesterol, and fasting blood glucose — each scored from 0 to 100 points, yielding a total CVH score of 0–100. Sleep was the new addition in 2022. The construct is oriented toward health promotion and primordial prevention rather than disease management, with higher CVH scores associated with lower risk across a broad range of cardiovascular and non-cardiovascular outcomes.
Key Concepts
The 8 Metrics and Their Scoring (2022 Revision)
| Metric | Ideal (100 pts) | Suboptimal (partial) |
|---|---|---|
| Diet (Healthy Eating Index-2015 / DASH / MEPA) | ≥95th percentile (MEPA 15–16) | Scaled 0–80 pts |
| Physical Activity (min/wk moderate-to-vigorous) | ≥150 min/wk | Scaled 0–80 pts |
| Sleep (average h/night) | 7–<9 h | 70 pts: 6–<7 h; 20 pts: 4–<5 h; 0 pts: <4 h |
| Nicotine exposure | Never smoker, no indoor secondhand exposure | Scaled; subtract 20 pts for living with active smoker |
| BMI (kg/m²) | <25 | 70 pts: 25–29.9; 30 pts: 30–34.9; 0 pts: ≥40 |
| Blood pressure (mm Hg) | <120/<80 | 75 pts: 120–129/<80; 0 pts: ≥160/≥100; subtract 20 pts if treated |
| Non-HDL cholesterol (mg/dL) | <130 | 60 pts: 130–159; 0 pts: ≥220; subtract 20 pts if treated |
| Fasting glucose (mg/dL) / HbA1c (%) | <100 (<5.7%); no diabetes | 60 pts: 100–125 (5.7–6.4%); 0 pts: DM with HbA1c ≥10% |
Changes from Life's Simple 7 (2010)
- Sleep added as the 8th metric, replacing the prior 7-metric system
- Total cholesterol replaced by non-HDL cholesterol (captures atherogenic particles more comprehensively)
- Scoring shifted from 3-tier (poor/intermediate/ideal) to a continuous 100-point scale per metric
- Oriented toward promotion of wellness rather than binary classification of risk
Population CVH Scores
- Mean CVH score in US women (2013–2018, LE8): 68.1/100; men: 63.6/100 — neither group approaches ideal sources/prepregnancy-aha-2023 (rating: high)
- Fewer than 1% of reproductive-age individuals have ideal levels of all 8 metrics
- Significant racial/ethnic disparities: non-Hispanic Black individuals consistently score lower across most metrics; data sparse for Asian/Hispanic subgroups and American Indian/Alaska Native populations
Application to Prepregnancy Health
- Prepregnancy LE8 scores are the primary exposure measure for CVH-APO association research
- CVH metrics before pregnancy are highly correlated with CVH levels during pregnancy — unfavorable prepregnancy CVH tracks into pregnancy
- All individual LE8 metrics associate independently with adverse pregnancy outcomes (APOs); composite CVH score shows stronger, graded associations than any single metric alone sources/prepregnancy-aha-2023 (rating: high)
- Life course approach: ideal CVH should be established in childhood/adolescence before reproductive years; adolescence is a critical transition when CVH trajectories diverge
Life Course and Primordial Prevention Context
- Primordial prevention: maintaining ideal CVH throughout the life course to prevent risk factor development
- LE8 scores are associated with lower risk for a broad range of cardiovascular and non-cardiovascular outcomes including APOs, CVD events, kidney disease, and downstream offspring CVD
- Psychosocial factors (stress, racism, resilience) identified by AHA as foundational determinants of CVH, not directly scored in LE8 but integral to the CVH framework
- Social determinants of health (income, education, built environment, food security) are upstream drivers of LE8 metrics
Contradictions / Open Questions
- Sleep metric validity during pregnancy: physiological changes in pregnancy alter sleep architecture independently of CVH — the sleep metric is not validated during pregnancy sources/prepregnancy-aha-2023 (rating: high)
- LE8 in pregnancy: all LE8 metrics shift physiologically during pregnancy (BMI increases, glucose rises, lipids increase); the construct is developed and validated for non-pregnant adults; application during pregnancy requires caution
- Metric prioritization: which of the 8 metrics is most important to target in specific populations (e.g., reproductive-age women, adolescents) to maximize benefit is not established
Connections
- Related to concepts/Prepregnancy-Cardiovascular-Health — LE8 is the measurement framework applied to prepregnancy period
- Related to concepts/Adverse-Pregnancy-Outcomes — all 8 LE8 metrics associate with APO risk
- Related to concepts/ASCVD-Risk-Assessment — LE8 is used alongside PREVENT equations in primary prevention
- Related to concepts/Dyslipidemia-Management — non-HDL cholesterol metric; LDL-C/non-HDL-C goals
- Related to concepts/Heart-Healthy-Dietary-Patterns — diet metric underpinned by 2026 AHA dietary framework
- Related to entities/Maternal-Health-Disparities — racial disparities manifest across all LE8 metrics