Are Relationships the Top Predictors of a Long Life? What the Research Actually Shows

Are social relationships really the top predictors of a long life? Strong social ties are among the most powerful predictors of longevity: a review of 148 studies found people with stronger relationships had 50 percent higher odds of survival, comparable to quitting smoking. But the claim that longevity has “nothing to do with food or exercise” goes too far. Not smoking, eating well, staying active, and a healthy weight together add more than a decade of life.

The idea that close relationships and social integration are the two strongest predictors of a long life spread widely after a 2017 TED talk by psychologist Susan Pinker. She described a chart showing social factors ranked above quitting smoking, exercise, and weight, based on research by Julianne Holt-Lunstad of Brigham Young University. Headlines then turned that into a claim that longevity has nothing to do with diet or exercise. The underlying research is strong and important, but the headline version distorts it. This article explains what the studies actually found, how social life affects the body, why the ranking should not be read too literally, and how to use the evidence in daily life.

Where Did the “Top Two Predictors” Claim Come From?

In her TED talk, Susan Pinker described visiting a village in Sardinia with an unusually high number of people living past 100 and linked their longevity to dense, lifelong social contact. She then presented a list of factors associated with lower risk of death, from treating high blood pressure and losing weight to exercising, quitting drinking, and quitting smoking, with close relationships and social integration at the top. Social integration, she explained, means how many people you interact with, including casual contacts such as the barista or the mail carrier. The list drew on a figure in Holt-Lunstad’s 2010 meta-analysis that placed the effect of social relationships alongside effects of other risk factors reported in separate studies.

What Did the 2010 Social Relationships Study Find?

The 2010 meta-analysis in PLoS Medicine by Julianne Holt-Lunstad, Timothy Smith, and Bradley Layton pooled 148 studies with 308,849 participants followed for an average of more than seven years. People with stronger social relationships had a 50 percent greater likelihood of survival during follow-up. The link held across age, sex, initial health, cause of death, and length of follow-up. It was strongest for complex measures of social integration, such as how many roles and relationships a person has and how involved they are (91 percent greater odds of survival), and weakest for simply living alone versus with others. The authors concluded that the influence of social relationships on mortality is comparable with well-established risk factors.

How Much Do Loneliness and Isolation Raise the Risk of Death?

A meaningful amount, according to several large reviews. A 2015 meta-analysis in Perspectives on Psychological Science by Holt-Lunstad and colleagues found that after adjusting for other factors, social isolation was linked to 29 percent higher odds of death, loneliness to 26 percent higher odds, and living alone to 32 percent higher odds. A larger 2023 analysis in Nature Human Behaviour by Wang and colleagues pooled 90 prospective studies with more than 2.2 million people. Social isolation was associated with a 32 percent higher risk of death from any cause and a 34 percent higher risk of cardiovascular death, and loneliness with a 14 percent higher risk of death from any cause.

Is Being Alone Worse Than Feeling Lonely?

They are different, and both matter. Social isolation is an objective lack of contact, while loneliness is the painful feeling that your relationships fall short of what you need. A person can live alone and feel connected, or be surrounded by people and feel lonely. A 2013 study in the Proceedings of the National Academy of Sciences by Andrew Steptoe and colleagues followed 6,500 adults aged 52 and older in England for about seven years. After accounting for age, background, and health at the start, the most socially isolated fifth had 26 percent higher mortality, while loneliness alone was no longer linked to death. The findings suggest that actual contact, help, and involvement may matter for survival even apart from how connected people feel.

How Do Relationships Affect the Body?

Through several routes. People with supportive relationships tend to handle stress better, which can mean lower blood pressure, steadier stress hormones, and less chronic inflammation. Friends and family also influence behavior: they encourage doctor visits, notice warning signs, help with medicines, and make it easier to exercise, eat regular meals, and avoid heavy drinking. Social ties may even affect the immune system. In a 1997 study in JAMA, Sheldon Cohen and colleagues gave 276 healthy volunteers nasal drops containing a cold virus. People with the fewest types of social relationships were about four times as likely to develop a cold as those with the most diverse social networks, even after accounting for prior immunity, age, and other factors.

Do Social Ties Really Matter More Than Diet and Exercise?

Not in the way the headlines suggest. The chart behind the claim placed the social relationship results next to effect sizes from separate studies of smoking cessation, alcohol, exercise, body weight, vaccines, and other factors. Those studies used different populations, different comparisons, and different ways of measuring each factor, so their numbers cannot be lined up as a strict ranking. A comparison of “strong versus weak social integration” is not the same kind of contrast as “exercising versus not.” Holt-Lunstad’s own conclusion was that social relationships are comparable to well-established risk factors, which is a powerful finding without claiming that food and exercise do not matter. People who are well connected also tend to have healthier habits, which makes the effects hard to separate.

How Much Do Healthy Habits Add to Life Expectancy?

A lot. A 2018 study in Circulation by Yanping Li and colleagues at Harvard followed 78,865 women and 44,354 men for up to 34 years and defined five low-risk habits: never smoking, a healthy body weight, at least 30 minutes a day of moderate to vigorous activity, moderate alcohol intake, and a high-quality diet. Compared with people who followed none of them, those who followed all five had a 74 percent lower risk of death during the study. At age 50, women with all five habits were projected to live about 14 more years and men about 12 more years than those with none. Not following these habits accounted for about 61 percent of premature deaths. Diet and exercise clearly matter.

Does Having a Sense of Purpose Help You Live Longer?

Research suggests it may. A 2019 study in JAMA Network Open by Aliya Alimujiang and colleagues followed 6,985 U.S. adults older than 50 in the Health and Retirement Study. People with the lowest sense of life purpose were about 2.4 times as likely to die during follow-up as those with the strongest sense of purpose, with especially strong links for heart and circulatory deaths. Purpose and social connection often go together: volunteering, caregiving, work, faith communities, and group activities give people both a reason to get up in the morning and regular contact with others.

How Do Longevity Factors Compare?

How Can You Build More Social Connection?

Small, regular contacts add up. The research on social integration counts both close bonds and casual ties, so brief daily interactions with neighbors, coworkers, shopkeepers, and acquaintances matter as well as deep friendships. Practical steps include scheduling a regular call or walk with a friend, joining a group built around an activity you enjoy, volunteering, taking a class, attending religious or community events, and saying yes to invitations even when it feels easier to stay home. Combining connection with healthy habits works especially well: a walking group, a community garden, or a sports league builds relationships and physical activity at the same time.

What If Socializing Feels Hard?

Many people find building connection difficult, whether because of introversion, social anxiety, depression, a demanding job, caregiving duties, or a recent move. The research does not require a large social life; it points to having reliable people and regular contact that suits you. Introverts may prefer a few close friends and quieter settings, such as a book club, a volunteer shift, or a weekly coffee with one person, over large gatherings. Starting small helps: a brief chat with a neighbor, a message to an old friend, or showing up to the same class each week so faces become familiar. Shared activities lower the pressure because attention is on the task rather than on conversation. When anxiety or low mood make contact feel impossible, therapy can help, and treating depression often makes it easier to reconnect. Persistent loneliness is worth raising with a doctor, just like any other health concern.

Do Online Relationships Count?

They can help, but research on in-person contact is stronger. Most of the studies linking relationships to longevity measured face-to-face contact, marriage, group membership, and practical support, often before social media existed. Online contact can maintain relationships across distance, help people with mobility limits or rare conditions find community, and lead to in-person meetings. Heavy passive scrolling, by contrast, has been linked in some studies to feeling more isolated. A reasonable approach is to use digital tools to arrange real-world contact and to stay in touch with people you care about, rather than as a replacement for time together.

Who Is Most at Risk of Social Isolation?

Older adults who live alone, have lost a spouse, have hearing or mobility problems, or no longer drive are at higher risk, as are caregivers, people with chronic illness or disability, recent immigrants, and people who have moved for work. Interestingly, the 2015 meta-analysis found social deficits were more strongly linked to death in samples with an average age under 65, which suggests isolation is a concern across adulthood rather than a problem limited to old age. Hearing loss deserves special mention because it makes conversation tiring and can quietly push people out of social life; treating it with hearing aids may help people stay connected.

What Are Health Authorities Doing About Loneliness?

Loneliness is now treated as a public health issue. In 2023 the U.S. Surgeon General issued an advisory describing an epidemic of loneliness and isolation and calling for action by individuals, health systems, schools, workplaces, and governments. The United Kingdom and Japan have appointed ministers responsible for loneliness, and the World Health Organization has launched a commission on social connection. Some health systems now screen for social isolation and offer “social prescribing,” in which clinicians refer patients to community groups, volunteering, or activity programs alongside medical care.

What Can We Learn From Long-Lived Communities?

Places known for unusual longevity, such as parts of Sardinia, Okinawa in Japan, and Nicoya in Costa Rica, tend to share both strong social bonds and healthy daily routines. Older people often live with or near family, stay involved in community life, and have clear roles. They also tend to walk a great deal, eat mostly plant-based traditional diets, and avoid heavy smoking. These communities illustrate the main point of this article: long life comes from a combination of connection, purpose, and healthy habits rather than any single factor. Studying them cannot prove which factor matters most, but it shows how the factors reinforce each other.

Does the Quality of Relationships Matter, or Just the Number?

Both, but quality counts. Married people and people with close family ties live longer on average, yet studies also show that strained, hostile, or unsupportive relationships can raise stress and harm health. Feeling that someone would help in a crisis, having people you can confide in, and having relationships that feel more supportive than demanding appear to matter more than the raw number of contacts. At the same time, the strong link between broad social integration and survival suggests that having many different kinds of ties, such as family, friends, coworkers, neighbors, and group members, offers protection that a single close relationship may not. A varied network also means support is still available if one relationship ends.

Can Improving Social Connection Actually Extend Life?

That has not been proven yet. Nearly all the evidence comes from observational studies, which show that connected people live longer but cannot fully rule out other explanations, such as healthier people being more able to stay socially active. Trials of programs to reduce loneliness, including group activities, befriending services, and cognitive behavioral approaches, have generally produced modest improvements in loneliness and well-being, but they have been too short and small to measure effects on lifespan. Given the consistency of the observational evidence, the low cost and low risk of building connection, and its other benefits for mood and quality of life, most experts consider it a sensible health goal while research continues.

How Do Social Ties Influence Healthy Habits?

Habits spread through relationships. People are more likely to exercise when they have a regular partner or group, more likely to eat regular, balanced meals when they eat with others, and more likely to quit smoking when people around them quit. Friends and family can also push in the wrong direction, for example by normalizing heavy drinking. This overlap is one reason the social and lifestyle research should be read together rather than as competing explanations. Choosing activities that combine company and movement, such as dancing, team sports, group walks, or community gardening, puts both kinds of evidence to work at once.

Common Myths

“Longevity has nothing to do with diet or exercise.” Five healthy habits are linked to 12 to 14 extra years of life.

“Only close friends count.” Social integration includes casual, everyday contacts.

“Living alone means being lonely.” Isolation and loneliness are different; many people live alone and feel connected.

“Loneliness is only an older person’s problem.” Links to mortality appeared across adulthood, and were stronger in younger samples.

“The famous ranking is precise.” It compares numbers from different studies and should not be read as a strict order.

Key Terms

Social integration: The range of roles, relationships, and activities a person is involved in.

Social isolation: An objective lack of social contacts and interactions.

Loneliness: The feeling that one’s social relationships are inadequate.

Meta-analysis: A study that combines results from many studies.

Social prescribing: Referral by health professionals to community activities that build connection.

The Bottom Line

The claim that close relationships and social integration are the top two predictors of a long life comes from real research: people with stronger social ties had 50 percent higher odds of survival across 148 studies, and isolation and loneliness are consistently linked to higher risk of death. But the claim that longevity has nothing to do with food or exercise is wrong. Five healthy habits are linked to 12 to 14 extra years of life. The evidence supports treating social connection as a major health factor alongside, not instead of, not smoking, good nutrition, and regular physical activity.

Frequently Asked Questions

What are the top predictors of a long life?

Research points to a combination of factors. Strong social relationships and social integration are linked to 50 percent higher odds of survival in a review of 148 studies, comparable to major risk factors. Not smoking, a healthy weight, regular exercise, moderate or no alcohol, and a good diet together add 12 to 14 years of life expectancy at age 50.

Does loneliness shorten your life?

Studies consistently link loneliness and isolation to higher risk of death. A 2015 meta-analysis found loneliness was associated with 26 percent higher odds of death and social isolation with 29 percent higher odds, after adjusting for other factors. A 2023 review of 90 studies with 2.2 million people found similar links. These are associations, but the evidence is consistent across countries and age groups.

Is social connection more important than exercise for longevity?

Not exactly. The popular ranking compares numbers from different studies measured in different ways, so it cannot show that social connection outranks exercise. The original researchers concluded that social relationships are comparable to established risk factors such as smoking. Both matter, and combining them, for example by exercising with friends, captures the benefits of each.

Why do social relationships help people live longer?

Supportive relationships appear to buffer stress, which may lower blood pressure, stress hormones, and inflammation. Friends and family also encourage healthy behavior, help with medical care, and notice warning signs. Social ties may even affect immunity: in one experiment, people with the least diverse social networks were about four times as likely to catch a cold after exposure to a virus.

How can I reduce loneliness and isolation?

Build regular contact into your routine: schedule calls or walks with friends, join a group based on an interest, volunteer, attend community or religious events, and accept invitations. Casual daily interactions count too. If loneliness feels persistent or overwhelming, talking with a doctor or counselor can help, and many communities offer programs designed to connect people.

References

1. Holt-Lunstad J, Smith TB, Layton JB. Social relationships and mortality risk: a meta-analytic review. PLoS Medicine. 2010;7(7):e1000316. PMID 20668659
2. Holt-Lunstad J, Smith TB, Baker M, et al. Loneliness and social isolation as risk factors for mortality: a meta-analytic review. Perspectives on Psychological Science. 2015;10(2):227–237. PMID 25910392
3. Wang F, Gao Y, Han Z, et al. A systematic review and meta-analysis of 90 cohort studies of social isolation, loneliness and mortality. Nature Human Behaviour. 2023;7(8):1307–1319. PMID 37337095
4. Steptoe A, Shankar A, Demakakos P, et al. Social isolation, loneliness, and all-cause mortality in older men and women. Proceedings of the National Academy of Sciences. 2013;110(15):5797–5801. PMID 23530191
5. Cohen S, Doyle WJ, Skoner DP, et al. Social ties and susceptibility to the common cold. JAMA. 1997;277(24):1940–1944. PMID 9200634
6. Li Y, Pan A, Wang DD, et al. Impact of healthy lifestyle factors on life expectancies in the US population. Circulation. 2018;138(4):345–355. PMID 29712712
7. Alimujiang A, Wiensch A, Boss J, et al. Association between life purpose and mortality among US adults older than 50 years. JAMA Network Open. 2019;2(5):e194270. PMID 31125099
8. Pinker S. The secret to living longer may be your social life. TED. 2017. ted.com

Last updated: October 10, 2026