A behavioural psychologist has revealed the exact number of friends you need to be successful – and why having too many can be just as bad as having none.

British anthropologist and ‘mathematician of relationships’ Robin Dunbar believes we can only maintain a certain number of human connections at any one time.

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In his latest book, Friends: Understanding the Power of our Most Important Relationships, the 73-year-old dissects scientific research into human groups to determine that 150 is the ‘magic number’ needed for success.

In modern times, Mr Dunbar says this number chiefly consist of ‘regular’ friends, who we see at weddings and school reunions where we promise to meet up more often, the Australian reported.

Read more at Daily Mail.