Sara Lewis is an experienced home economist and food writer. She was the cookery editor of 'Practical Parenting' magazine for over 12 years and is the author of many Hamlyn cookery books including 'Bread Machine Easy', 'Hamlyn All Colour Cookbook: 200 Cakes and Bakes' and 'Hamlyn All Colour Cookbook: 200 Make Ahead Recipes'.
Tracy Parker is a registered dietitian who has spent more than 15 years working with people with IBS.
Six of those were spent as a research dietitian at Addenbrooke 's Hospital in Cambridge, England, studying the role of diet in the management of IBS and Crohn's disease.