Why Social Connection Matters for Your Health

When people list what they do for their health, they tend to mention food, exercise and sleep. Very few mention their friends. Yet a large and growing body of evidence suggests that our relationships affect our health about as much as the habits we usually think of first.

This guide looks at what that evidence says, why connection might matter so much, and what you can do if you would like more of it.

What social connection means

The US Centers for Disease Control and Prevention (CDC) describes social connection in terms of the number, quality and variety of your relationships. Feeling socially connected means having the relationships you want, feeling that you belong, and having the support and care that you need.

Two terms are often confused:

• Social isolation is an objective state: having few relationships, little contact with others and little support.
• Loneliness is a feeling: being alone or disconnected, or not having meaningful or close relationships. The CDC describes it as the gap between the connection you have and the connection you want.

They do not always go together. Someone who lives alone and sees few people may feel perfectly content. Someone surrounded by colleagues, family and hundreds of online contacts may feel deeply lonely. As the CDC puts it, even a person with a lot of friends can feel lonely.

How common is loneliness?

Common enough to be considered a public-health issue. A World Health Organization (WHO) commission reported in 2025 that about 1 in 6 people worldwide experience loneliness. It is found in every age group and region, and is most common among adolescents and young adults, at around 1 in 5.

In the United States, the CDC reports that about 1 in 3 adults say they feel lonely, and about 1 in 4 say they lack social and emotional support.

Loneliness is, in other words, an ordinary human experience. It is not a personal failing.

What connection does for health

The protective effects

According to the CDC, social connection can help reduce the risk of chronic disease and serious illness, including:

• heart disease;
• stroke;
• dementia;
• depression and anxiety.

It can also improve our ability to manage stress, our eating habits and physical activity, and the quality of our sleep. People with stronger social bonds, the CDC says, are more likely to live longer, healthier lives.

The risks of going without

The reverse also holds. The CDC states that social isolation and loneliness can increase a person's risk of heart disease and stroke, type 2 diabetes, depression and anxiety, and suicidality and self-harm.

The WHO commission estimated that loneliness accounts for approximately 871,000 deaths each year worldwide, which is around 100 every hour.

How large is the effect?

One widely cited analysis, published in PLOS Medicine in 2010, combined 148 studies involving more than 300,000 people. It found that those with stronger social relationships had a 50% greater likelihood of survival over the period studied than those with weaker ones. The authors noted that this is comparable to the effect of well-established risk factors.

A word of caution about what this kind of research can show. These are observational studies: they find that connection and health go together, which is not the same as proving that one causes the other. People in poor health may find it harder to maintain relationships, for instance. But the consistency of the findings across many studies and countries is why health bodies now take the subject seriously.

Why relationships might matter so much

Researchers point to several likely routes.

Practical support. The CDC notes that relationships give us physical support, such as a lift to a medical appointment or help with childcare at short notice, as well as someone to notice when we are unwell.

Emotional support. Having people to turn to in good times and hard times makes stress easier to bear. Stable, supportive relationships give us what we need to cope with life's difficulties.

Healthier choices. People with healthy relationships are more likely to make choices that lead to better health, the CDC says. Friends who walk, cook or keep reasonable hours make it easier to do the same.

A sense of meaning. The NHS notes that good relationships help to build a sense of belonging and self-worth.

Quality over quantity

None of this means you need a packed diary or a large circle. What the definitions emphasise is having the relationships you want, of a quality that supports you.

A few relationships in which you can be honest, and where help flows in both directions, are worth more than dozens of acquaintances. The aim is not to become more sociable than you naturally are. It is to make sure that the connections you value are kept in good repair.

Practical ways to build connection

"Connect with other people" is the first of the NHS's five steps to mental wellbeing. Its suggestions are deliberately small.

Strengthen what you already have

• Take time each day to be with family, for example by fixing a time to eat together.
• Arrange a day out with friends you have not seen for a while.
• Switch off the television to talk or play a game.
• Have lunch with a colleague.
• Visit a friend or relative who needs support or company.

Make contact regular

Friendships are maintained by repetition more than by grand gestures. A standing arrangement, such as a call every Sunday, a walk every Wednesday or a monthly meal, removes the need to keep organising, which is where most good intentions die.

Find shared activity

It is easier to get to know people while doing something together than by trying to make conversation. Classes, sports clubs, choirs, walking groups, community gardens, faith communities and volunteering all provide a reason to turn up and a subject to talk about. The NHS specifically suggests volunteering at a local school, hospital or community group.

Use technology well

The NHS encourages making the most of technology to stay in touch with friends and family, especially those who live far away. It adds a caution: do not rely on technology or social media alone to build relationships. It is easy to slip into only ever texting or messaging.

A reasonable rule is to use screens to arrange or supplement contact, and not as the whole of it. A video call is closer to being in the same room than a string of messages.

Give as well as receive

Helping someone else is one of the most dependable ways to feel connected. Checking on a neighbour, offering a lift or simply listening properly all count.

If connecting feels hard

It often does. Shyness, a move to a new place, bereavement, illness, caring responsibilities and long working hours all make it harder, and the CDC lists several of these among the factors that raise the risk of isolation.

• Start small. A brief conversation with a neighbour or a shopkeeper counts. Small exchanges build confidence for larger ones.
• Lower the stakes. Suggest something short and specific: a coffee, a twenty-minute walk.
• Expect it to be slow. Acquaintance turns into friendship through repeated contact over months.
• Do not read too much into a no. People are busy. Ask again another time.

The short version

Time spent with people you care about is not time taken away from looking after your health. It is part of looking after it. If you do one thing after reading this, send a message to someone you have been meaning to contact, and suggest a day.

For other everyday foundations, see Everyday habits for better wellbeing.