You can improve your digestive system by eating high quality, fresh organic foods and make sure to chew your food well. You need also to choose unprocessed foods. Junk foods like French fries and anything that is pickled will slow down your digestion. Drink lots of water and eat fruits and veggies in plenty. The fiber in fruits and vegetables helps improve digestion. Check out http://www.ehow.com/how_2092448_improve-digestion.html.
Do you drink water? And I mean water (with nothing added to it). Most people don't drink enough water. The digestive system is usually the first part of the body to shout "give me some water". Are you listening? Drink water before you dash off in a hundred directions in reaction to your replies.