There are a number of reasons why you might be struggling to get things moving—including not drinking enough water, traveling, lack of physical activity, suboptimal stress management, and again, lack of dietary fiber.
In addition to upping your fiber intake through diet and/or high-quality fiber supplementation, be sure that you’re hydrating properly and moving your body to promote regularity.* If you suspect that external stressors are the reason your poop is MIA, try out a mindfulness practice (like meditation, yoga, or deep breathing exercises).