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Mrs. Jones is a sedentary 83-year-old woman who is 5 ft 4 in tall and weighs 125 lb. She has been at this weight for about a year. She says that a typical diet for her includes a breakfast of toast (white bread, no butter), a boiled egg, and coffee with cream. For lunch she often has a cheese sandwich (white bread) and a glass of whole milk. For supper she prefers cream of chicken soup and a slice of frosted cake. Mrs. Jones ’ s diet is most likely to be inadequate in which one of the following?