Friends make the world go round, or so the saying goes. ... A study by Harvard University in the US says there's a ripple effect with social or behavioural contagion – so your happiness or good health habits act like a virus, influencing your friends and others in your broader social network.

How do friends influence you?

Friends are important – they give us a feeling of belonging, bring fun and laughter, lend an extra hand, offer emotional support, and give guidance when you need it. And, whether you realize it or not, their influence goes well beyond the moment. Your close friendships help to shape the course of your life.

Can friends affect your personality?

The few studies that have examined the relationship between personality and friendship satisfaction have found that the traits of extraversion and agreeableness are associated with having more friends, closer friendships, and attaining a higher social status; however, few studies have examined the influence ...