For more than 75 years, Harvard University studied a group of men from all walks of life to find what the key to happiness was.
It found that as long as people had a roof over their head and food on the table - love is the answer.
The Harvard Study of Adult Development has tracked the lives of 724 men for more than 75 years. The study has looked into their lives – their work, their home life, and their quality of life.
The study was divided into two groups of men. One group started when the men were sophomores at Harvard. Many of these participants graduated and went to serve in World War II. The second group were young boys from some of the poorest neighborhoods of Boston. Every two years, these men are interviewed.
60 of the original 724 participants are still alive today.
Its conclusion from tracking their lives over three-quarters of a century is that the key to keeping us happier and healthier is good relationships.
Researchers discovered that when you have someone to rely on, your nervous system relaxes, your brain stays healthier for longer and reduces both emotional and physical pain. You don't just feel better - you are better.