As you may already know, fruits are great as a natural cure for constipation.
Grape fruits are great for challenging your digestive system, and prunes off course works wonders as we all know. Most people would probably prefer the grapes over the prunes, I know I would.

You also should consider apples a natural cure for constipation, because their skin has a lot of fiber in them and therefore are great as a constipation cure.
If you have a sweet tooth, you might eat a little apple pie, as long as the apple skin is in the pie, it will help your digestive system on its way.
If you are a little overweight, the raw apples might be the better choice as it has a lot less calories…