A decreased appetite is almost always seen among elderly adults, and no physical cause may be found. But emotions such as sadness, depression, or grief can lead to a loss of appetite. People with chronic illness need to increase their protein and calorie intake by eating high-calorie, nutritious snacks or several small meals during the day. Liquid protein drinks may be helpful. Family members should try to supply favorite foods to help stimulate the person's appetite. Keep a record of what you eat and drink for 24 hours. This is called a diet history.