What can be the solution fot proper digestive system?

Eat healthy/exercise. Your question is a little vague, but you can't go wrong with the following advice: eat healty, well-balanced meals high in fiber & low in animal fat; practice moderation & avoid excess calories to keep your weight under control; regular exercise improves GI transit of food through your gut. Keep in mind that too much of a good thing is not a good thing; fad diets & supplements often come & go.