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An 84-yeаr-оld mаle, is brоught tо the clinic by his dаughter, who is concerned about his poor appetite, frequent complaints of fullness after small meals, and recent 8-pound weight loss over the last month. He denies nausea, vomiting, or abdominal pain, but says he feels “stuffed” quickly and doesn’t enjoy food like he used to. His bowel habits are unchanged. Vital signs: BP: 128/76 HR: 78 Temp: 97.8°F Weight: 132 lbs (previously 140 lbs two months ago) Physical exam reveals a soft, non-distended abdomen with normal bowel sounds. He takes a proton pump inhibitor (PPI) daily for GERD. The nurse recognizes the need to assess for digestive system changes associated with aging. Which of the following age-related digestive changes is most likely contributing to Mr. D.'s symptoms?