
As we age, nerve cells that control muscles that move food through the digestive tract gradually die off, especially in the large intestine—one reason why constipation may occur more frequently as you get older. Fiber helps keep things moving. Men 50-plus should aim for 30 grams of fiber per day; women, 21 grams. Get your fill by eating plenty of whole-grain cereals and breads, fruits, vegetables and beans.