Lucy is a 34-year-old female training for a marathon race of26.2 miles. She is 5 ft 5 in tall and currently weighs 120 lb. Onher long runs of more than 3 hours, she has been drinking water,approximately 30 oz, and consuming one GU (an energy supplementcontaining 100 kcal from simple sugar) at the 2-hour mark. Lucy iscoming to you for advice because she is becoming increasingly weakand nauseous toward the end of her runs. She reports feelinglight-headed and irritable on her long training days. Lucy statesthat she is eating a tuna fish sandwich with 4 oz of tuna mixedwith 3 tbsp of mayonnaise on whole wheat bread approximately 20minutes before her run. How much fluid should Lucy be consumingduring a 3-hour run? Please show the calculations you used to comeup with the answer.
