Sources

Annie Lowrey: Do fruit and veg make you happy, or do happy people eat more fruit and veg? Science says: Dunno! Both? http://t.co/rEFGf3V5 via @felixsalmon

felix salmon: Eat plants, be happy http://t.co/mSBGG4Yw

Henri Tournyol du Cl: This has to be the economic paper of the year: http://t.co/lFBt2GRW

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