That lovin’ feeling: It only lasts a year. “The powerful emotions that bowl over new lovers are triggered by a molecule known as nerve growth factor (NGF), according to Pavia University researchers.

The Italian scientists found far higher levels of NGF in the blood of 58 people who had recently fallen madly in love than in that of a group of singles and people in long-term relationships.

But after a year with the same lover, the quantity of the ‘love molecule’ in their blood had fallen to the same level as that of the other groups.”

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