Christina was born in Edinburgh and lived there until she was 18. Her aunt, Midi Fairgrieve, was a practising nutritional therapist in Edinburgh and helped to develop Christina's interest in nutrition from a young age. Midi then went on to set up Detox International, pioneering juice cleanse-based holistic residential retreats. This was to lay the foundations for Christina's own professional path.
Christina read law at Oxford University where she was also a keen sportswoman, competing in swimming, running and modern pentathlon (the latter at an international level). She worked at a magic circle City law firm for several years while also gaining a BSc in Nutritional Medicine. After deciding to leave law, in 2009 she set up Radiance, the UK's first nationwide juice cleanse delivery service, with her best friend Clare Neill. Radiance specialises in certified organic, cold-pressed nutritional juice cleanse programmes.