The Princess Royal is well known for being the hardest-working royal - she carried out no fewer than 214 engagements last year despite the bereavement of losing the late Queen.
And with a leading role in the Coronation announced this week - where the King's sister will act as "personal aide-de-camp" riding behind Charles and Camilla on horseback following the ceremony - her busy role shows no signs of abating.
But what does Princess Anne eat to fuel so many public appearances?
