The advantage yogurt has over other milk products is that it is a probiotic food, which means that it nourishes the helpful bacteria in your gut. But not just any yogurt, and not even Greek yogurt. Choose low-fat probiotic yogurt that contains an extra dose of helpful bacteria. Yogurt containing Lactobacillus GG (LGG) has shown to relieve the adverse gastrointestinal effects including constipation.