Good relationships.

In fact, good relationships are significant enough that if we had to take all eighty-four years of the Harvard Study and boil it down to a single principle for living, one life investment that is supported by similar findings across a wide variety of other studies, it would be this:

Good relationships keep us healthier and happier. Period. So if you’re going to make that one choice, that single decision that could best ensure your own health and happiness, science tells us that your choice should be to cultivate warm relationships.

2: Why Relationships Matter

“These feelings, big and small, are connected to biological processes. Just as our brain responds to the presence of food in our bellies by rewarding us with pleasure sensations, so does it respond to positive contact with others. The brain effectively says to us: Yes, more of this, please. Positive interaction tells our bodies that we are safe, reducing our physical arousal and increasing our sense of well-being. By contrast, negative experiences and interactions create a sense that we are in danger and stimulate us to produce stress hormones like adrenaline and cortisol. These hormones are part of a cascade of physical reactions that raise alertness and help us respond to situations of critical importance—the “fight or flight” response. They are a big part of what gives us that feeling of stress.

To say that human beings require warm relationships is no touchy-feely idea. It is a hard fact. Scientific studies have told us again and again: human beings need nutrition, we need exercise, we need purpose, and we need each other.

The same is true for social fitness.

It’s not easy to take care of our relationships today, and in fact, we tend to think that once we establish friendships and intimate relationships, they will take care of themselves. But like muscles, neglected relationships atrophy. Our social life is a living system. And it needs exercise. You don’t have to examine scientific findings to recognize that relationships affect you physically. All you have to do is notice the invigoration you feel when you believe someone has really understood you during a good conversation, or notice the tension and distress after an argument, or the lack of sleep during a period of romantic strife.

Our brains, tuned for novelty and danger, catch fire when stimulated by the wonders of new technology and the stresses of the workplace. Compared to those two things, the subtle currents of our positive relationships, so important to our well-being, are likely to be overshadowed. If our relationships—both at work and at home—are going to thrive in this new work environment, we have to elevate and care for them. We are the only ones who can. If we don’t, and if the Harvard Study still exists in eighty years, then when today’s youngest generation reaches their 80s and the interviewers ask if there was anything they regret about their lives, they might look back, as some of our First Generation participants did in their comments quoted earlier in this chapter, and realize that something crucial has been lost.