Petronella is a Functional Medicine Practitioner, writes for Tatler and has a very impressive celebrity client list. She has been in private practice since 2004 and specialises in digestive, skin and weight issues. Petronella is a firm believer in the wisdom of the body and that food and exercise is the only medicine we need – “the power is in our hands,” she says.

Her best-selling book ‘The Human Being Diet’ has sold out many times and her most recent HBD cook book is also heading that way.

There is much conflicting advice out there and Petronella gives us no nonsense nutrition advice to help us live our best lives no matter what age we are.