Yogurt that contains Probiotics which is live bacteria which is great for your digestive system can sometimes help relieve a person of constipation.
Although Yogurt does work to relieve some people of constipation and others say it doesn't work for them but it's worth a try and yogurt is good for your health and digestive system anyway.
If you're still constipated you can drink some prune juice or eat prunes and even sometimes Cranberries and Cranberry Juice can help get rid of constipation.