Rhiannon Lambert, celebrity nutritionist on being a 17-year-old opera singer, social media sabbaticals and foods for your brain

Rhiannon Lambert - celebrity nutritionist to the stars - was plucked from relative obscurity at just 17 via a radio competition to become a leading soprano opera singer. She now has three degrees, a published book and a hugely engaged social following. We chat about food and mood, the way food and diet is presented in social media and how she wants to re-define the word ‘selfish’.