Now, researchers are "starting to pay attention to the importance of friendship and social networks in overall health," finding that "older people with a large circle of friends" may be "less likely to die," and that "strong social ties could promote brain health as we age." And, although "many friendship studies focus on the intense relationships of women, some research shows that men can benefit, too."

Researchers remain unclear, however, "exactly why friendship has such a big effect," as "the benefits go well beyond physical assistance." Parker-Pope speculates that "it may be that people with strong social ties also have better access to health services and care," or that "people with strong friendships are less likely than others to get colds...because they have lower stress levels."