Denby, Nigel. The GDA diet : shop yourself thin : your supermarket weight loss guide : the passport to a lifetime of permanent weight control and better health / Nigel Denby. - Hoboken, NJ : John Wiley & Sons, 2008. - xi ,237 p. : ill. ; 20 cm. Includes index ISBN: 9781906465391 Subjects--Topical Terms: Food--Composition.Food--Labeling.Reducing diets.Shopping.