In the early 1960s scientists at the University of California, Berkeley set out to establish the key factors affecting health and longevity.

Their results, known as the 'Alameda 7', you already know: don't smoke, drink in moderation, sleep seven to eight hours a night, exercise, eat regular meals, maintain a moderate weight, eat breakfast.

Years later, however, the same team discovered an eighth factor, one that proved more important than all the others: social connection.

When we form meaningful bonds with others, our wounds heal faster, we shake off infections more quickly and our blood pressure drops. We are less likely to have Alzheimer's, heart attacks or strokes. When people feel that they have strong social support, they perform better on tests of mental focus, memory and problem solving. Greater connection can fuel creativity, increase our financial stability and enhance our work productivity. But making friends can also be daunting.