Growing numbers of people catching coronavirus are experiencing an unpleasant distortion of smells. Scientists are still unsure what causes this often distressing condition, known as parosmia, where previously enjoyable aromas trigger feelings of disgust. Madeleine Finlay talks to science correspondent Linda Geddes about her own parosmia, and chemist Dr Jane Parker discusses research into why the smell of coffee seems to be a trigger for so many people. Help support our independent journalism at theguardian.com/sciencepod