For a couple of years, Marlies Eriksen had been struggling with headaches that came more and more often. She was sleeping worse than she used to, and a stubborn little belly pouch had appeared. Her bones felt strangely ‘dry.’

Then one morning, on a family vacation on a Greek island, she woke up feeling as if every spark was gone. As if someone had, in an instant, switched off her good mood, the upbeat mindset she had always felt was one of her hallmarks. A defining trait she had valued deeply in herself her whole life.