The happiness gene that determines how happy we are!

How happy we are may depend as much on our genes as how well our lives are going, researchers have found.

They say that they have found a gene that releases 'happy' chemicals into the brain.

The 5-HTT gene also helps nerve cells recycle serotonin, another chemical in the brain which is linked to mood and depression.

Scientists from the London School of Economics analysed the genes of 2,500 people and found the happiest were the ones who inherited two 'long' versions of the 5-HTT gene.

The least happy were those who inherited the two 'short' versions of the gene.

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