 Grant suffered with chronic indigestion and rheumatoid arthritis, but discovered that the Hay diet helped to alleviate the symptoms.She became a passionate believer in the diet, and after advocating for it in a series of articles in "Sunday Graphic", she was visited by William Howard Hay, the developer of the diet, who asked her to create a recipe for British tastes.The book, "The Hay System Menu Book" was published in 1937.