The 17 Factors That Most Meaningfully Influence Health and Longevity

Health has become complex.

There is no shortage of tools, supplements, and “optimization” strategies. But the underlying evidence tells a much simpler story: a relatively small number of factors account for the majority of long-term health outcomes.

Building on decades of research, this framework outlines 17 evidence-based factors that influence both lifespan and healthspan.

What matters most

A small number of factors drive the majority of outcomes.

The figures below reflect the approximate difference in life expectancy between higher-risk and optimal states:

• Smoking: ~10-year difference (smoker vs. non-smoker)
• Mental health: ~10-year difference (untreated vs. well-managed)
• Physical activity: ~8-year difference (low vs. high fitness)
• Diet quality: ~5-year difference (poor vs. high-quality diet)
• Sleep: ~2 to 5-year difference (poor vs. consistent sleep)

These are not precise predictions, but they are directionally consistent across large populations.

What works in the background

Other factors influence long-term risk more quietly, but remain critical:

• Cholesterol (ApoB): ~3 to 6-year difference (elevated vs. optimal)
• Blood pressure: ~3-year difference (uncontrolled vs. controlled)
• Metabolic health and inflammation: meaningful multi-year impact across biomarkers
• Hormonal health: ~2 to 5-year difference where clinically appropriate

These drive cardiovascular disease, metabolic dysfunction, and organ decline over time.

Often overlooked, but meaningful

Additional contributors with smaller but consistent effects:

• Social connection: ~2-year difference (isolated vs. socially connected)
• Preventive screening: ~2-year difference (late vs. early detection)
• Air quality: ~1-year difference (high vs. low exposure)
• Oral health: ~1-year difference (untreated vs. maintained)
• Alcohol: modest benefit when minimized

Individually smaller, but relevant within the system.

A note on interpretation

These estimates are derived from population-level data.

They are:

• Not additive
• Dependent on baseline risk
• Strongly interconnected

Improvement in one area often reduces risk across others. This is a system, not a checklist.

What is less important than it seems

Many popular “longevity” interventions remain unproven in healthy adults:

• IV vitamin therapies
• NAD+ precursors (NR, NMN)
• Most supplements outside of correcting deficiencies
• Whole-body scans in asymptomatic individuals
• Direct-to-consumer biological age tests
• Continuous glucose monitoring in non-diabetics

At present, there is no strong evidence that these produce meaningful changes in lifespan or healthspan.

Why this remains difficult

The challenge is not awareness. Most people already know the fundamentals. The challenge is consistent execution.

These factors are interdependent:

• Sleep affects metabolism
• Stress affects behavior
• Mental health affects adherence

Addressing one in isolation is rarely effective. Health is not built through isolated interventions. It is the result of a system of behaviors, sustained over time.

In simple terms

You do not need more inputs. You need to focus on the factors that matter and apply them consistently. Because the difference is not marginal. It is measured in years.

About Dr Oliver Zolman

Dr Oliver Zolman, MBBS BSc, is a medical doctor and longevity researcher based in Cambridge, UK. He is the architect of the 82 Organs Framework and the co-creator of Project Blueprint with Bryan Johnson. He was recruited for the $101M XPRIZE Healthspan Prize and has been featured in the BBC, Bloomberg, Netflix, GQ, and Rolling Stone. Dr Zolman is the founder of Longevity School and serves as a medical advisor to Mos Health.

This article is educational and does not constitute medical advice.