In 1939, a doctor at Harvard University initiated a research study into long term health and happiness. He recruited 268 physically and mentally healthy young men who were all in their second year of study at Harvard University, including one John F. Kennedy, who went on to become US President. As the story goes, as part of the recruitment process, “the men who were chosen for the study had what the team considered a ‘masculine body build’: significant muscle mass, narrow hips and broad shoulders. The study participants were asked about masturbation and their thoughts on premarital sex. They were also measured for brow ridge, moles, penis function and the hanging length of their scrotum.”

As it turns out, the hanging length of one’s scrotum isn’t a significant factor in one’s long term health and happiness.

What is important is love.

Over the last eight decades, the study has grown to include a number of control groups, wives and children. The longer the trial has gone on, the stronger the conclusions, that “Close relationships, more than money or fame, are what keep people happy throughout their lives, the study revealed. Those ties protect people from life’s discontents, help to delay mental and physical decline, and are better predictors of long and happy lives than social class, IQ, or even genes.”

The short and intense forms of love are very strongly associated with happiness. Remember the study we discussed in earlier posts from George MacKerron, who mapped the correlation of happiness to activity and location of the users of his specifically designed mobile phone app? With hundreds of thousands of data points, he was able to show that people were happy when they were exercising, when they were at the theatre, ballet, or a concert; when they were at a museum or an art exhibit; and while doing an artistic activity (like painting etc.). Though at the top of his list, the greatest number of people were at their greatest level of happiness during “sexually intimate moments” (on a date, kissing, or having sex).

Of course, love is more than just a good snog, but it demonstrates that intimate connection with another person you love, and who loves you, is an intense and intoxicating source of joy.

Other research into the relationship between love and joy shows the same thing as the Harvard Study of Adult Development. The “Very Happy People” study showed that there was a 0.7 correlation between social support and happiness, which is higher than the connection between smoking and cancer. People with one or more close friendships are more likely to be happier, and those with few social connections are more likely to be depressed than those who have more social connections. People with strong and healthy relationships are less likely to feel stressed by challenging situations. Supportive marriage is a cause of happiness.

We always need to be careful in interpreting these sorts of conclusions, remembering that correlation does not equal causation – people don’t get depressed because they have no friends. Often times there are underlying factors contributing to both a persons depression and difficulty in forming solid friendships.

What we can safely say is that happiness and love are intimately connected. The deeper the social bond, the more likely there is to be happiness.

It’s also important to remember that it’s not quantity of the social connections that’s important, but the quality of the social connections. A hundred loose associates, or deep but unequal, unreciprocated relationships are not associated with happiness. Joy comes from sincere, committed love that gives as much as it receives.

Do those themes sound familiar? They are the same sort of themes that we have discussed on other blogs in this series, the same sort of things that are common to our personal search for joy – kindness, giving, honesty and acceptance, committed action to a deeper value. When you apply the same things that bring individual joy to a relationship, they also bring joy, but to more than just yourself.

And what else better sums up love, but sharing the best things in life with another person.

If you want to foster happiness, invest in quality connections with other people by sharing those same things that bring individual joy. Be thankful, be kind, be generous and be committed and there will be more than enough joy to go around.