Living longer is not the result of only one factor. The strongest message from human longevity research is that lifespan is shaped by a combination of factors that work together over time. These include diet, physical activity, sleep, mental well-being, social connection, and the conditions in which people live.

Researchers study longevity in many ways. Some follow large groups of people for years or decades and compare health outcomes. Others examine biological markers such as inflammation, cholesterol, insulin resistance, muscle mass, or epigenetic aging. Genetics also plays a role, but it does not explain everything. In this document, we provide an overall review of the main findings from the longevity literature.

You can find the raw data collected in this Google Sheet, which is regularly updated with new studies and allows  to easily access the date, key information, and original source for each entry.

1. Diet matters, but overall patterns matter more than single foods

One of the clearest findings in longevity research is that overall diet quality matters. Dietary patterns similar to the Mediterranean diet are consistently associated with lower mortality and better health in older age. Diets rich in plant foods, olive oil, fish, and minimally processed foods tend to perform better than typical Western-style diets high in refined products and excess red meat.

Some individual foods and drinks also appear repeatedly in the research. Coffee, green tea, olive oil, and dark chocolate are often associated with lower mortality in some studies. Chili peppers and fish intake also show up as potentially beneficial. But these findings should be interpreted carefully. People who consume these foods may also differ in many other ways, such as income, exercise habits, education, or healthcare access.

The most reliable takeaway is simple: people tend to do better when they follow a balanced, high-quality diet.

2. Physical activity is one of the strongest predictors of longer life

If there is one factor that appears again and again in human longevity research, it is movement. Regular physical activity is strongly associated with lower mortality risk. This includes moderate-to-vigorous exercise, walking, cycling, running, and even light daily activity.

The research also shows that fitness itself matters. Faster walking speed, stronger grip strength, better muscle mass, and higher aerobic capacity are all linked with better survival. These are important not only because they reflect exercise habits, but also because they indicate resilience and functional reserve as people age.

Just as important is the opposite side of the picture: too much sitting is linked to worse outcomes. Long periods of sedentary behavior are associated with higher mortality, even in people who are otherwise relatively healthy.

The practical message is not that everyone needs to become an athlete. It is that regular movement, preserved strength, and less sedentary time are among the most reliable foundations of healthy aging.

3. Sleep and body rhythm play a bigger role than many people realize

Sleep is not just rest. It is a biological process closely tied to metabolic health, hormonal balance, brain function, and recovery. Longevity research suggests that both too little sleep and too much sleep are associated with higher mortality.

Circadian rhythm also matters. People exposed to long-term night shift work or chronically irregular schedules may face higher risks related to metabolic disruption, inflammation, and cardiovascular health. In that sense, longevity is influenced not only by how much we sleep, but also by when we sleep and how stable our routine is.

The best-supported pattern is regularity: a consistent rhythm, enough sleep, and avoiding chronic circadian disruption where possible.

4. Social connection is a health factor, not a luxury

One of the most overlooked areas of longevity research is the importance of human relationships. People who are socially connected generally do better than those who are isolated. Marriage, family life, social ties, religious participation, and community belonging are all associated in various studies with lower mortality.

At the same time, loneliness and isolation are repeatedly linked to higher risk of death. This may happen through several pathways: higher stress, depression, poorer sleep, worse health habits, and reduced support during illness or crisis.

Social life is difficult to measure precisely, and not every association is causal. But the overall pattern is strong enough to take seriously. Healthy aging is not only biological. It is also relational.

5. Mental well-being influences longevity too

Psychological health is closely linked to physical health across the lifespan. Research suggests that optimism, purpose in life, positive affect, and resilience are associated with better survival outcomes. On the other hand, depression, chronic stress, PTSD, and persistent psychological distress are associated with increased mortality risk.

These findings make sense biologically. Mental distress can affect inflammation, sleep, heart health, hormonal regulation, and behavior. It can also make healthy routines harder to maintain. Meanwhile, a stronger sense of meaning and emotional stability may support healthier habits, treatment adherence, and social engagement.

This does not mean people can “think themselves into longevity.” It means that mental health is part of the longevity equation, not separate from it.

6. Biology and genetics matter, but they are not destiny

Some people are biologically more protected than others. Certain genetic variants are associated with higher or lower risk of disease and mortality. Biomarkers such as inflammation, insulin resistance, blood pressure variability, cholesterol balance, muscle mass, and epigenetic aging can also give clues about how the body is aging.

Still, genetics does not fully determine lifespan. Research suggests that inherited factors explain only part of the variation in how long people live. Environment, behavior, healthcare, and social conditions remain extremely important.

This is one of the most encouraging findings in longevity science: biology matters, but much of healthy aging is still modifiable.

7. Where and how people live affects how long they live

Longevity is not just a matter of personal habits. It is also shaped by the wider environment. Cleaner air, quieter neighborhoods, access to green spaces, safer work, better housing, education, and healthcare access all support longer life. By contrast, pollution, poor housing, occupational hazards, chronic insecurity, and poverty can shorten it.

This means longevity is partly a personal project, but also a public-health issue. The conditions that allow people to live longer are not distributed equally, and that inequality shows up clearly in health outcomes.