# Fiber in the third trimester

Source: https://www.pregnancypowerhour.com/nutrition/fiber-trimester-3
Last updated: 2026-07-01

> In the third trimester, adequate fiber intake becomes especially crucial to gently support digestion and manage constipation, often exacerbated by the growing uterus.

As you move into the third trimester, the physical changes within your body, particularly the increasing size of your uterus, can place additional pressure on your digestive system. This can often lead to increased instances of constipation, making adequate fiber intake a particularly important focus during these final months. While fiber is a vital macronutrient throughout pregnancy, its role in maintaining comfortable bowel movements becomes even more pronounced as your body prepares for birth.

The Institute of Medicine (IOM) suggests a daily fiber intake of 28g for pregnant individuals. However, many people in the U.S. typically consume closer to 15g per day, leaving a significant gap. Bridging this gap can make a tangible difference in your daily comfort. When combined with sufficient water intake—aiming for at least 8 glasses per day—fiber is considered a first-line approach by organizations like the American College of Obstetricians and Gynecologists (ACOG) for managing pregnancy-related constipation. This collaborative approach, focusing on both fiber and hydration, offers a gentle and effective way to support your digestive system.

Beyond digestive comfort, fiber also plays a valuable role in supporting stable blood sugar levels. It helps to slow down the absorption of glucose, which can be beneficial for overall energy and metabolic balance as your body manages the demands of late pregnancy. This is a practical way to support your body's systems, much like considering your [Magnesium in the third trimester](/nutrition/magnesium-trimester-3) intake for muscle function and relaxation, or ensuring adequate [Zinc in the third trimester](/nutrition/zinc-trimester-3) for immune support.

Incorporating more fiber into your diet can be a straightforward process, focusing on whole foods. Vegetables, fruits, whole grains, legumes, nuts, and seeds are all excellent sources. For those times when dietary intake alone feels challenging, safe fiber supplements like psyllium husk and methylcellulose can be supportive options throughout pregnancy. It's always about finding what works best for you and your body at this stage.

While increasing fiber is generally beneficial, it's also helpful to be mindful of balance. Consuming excessive amounts, typically over 50g per day, can sometimes lead to bloating or potentially reduce the absorption of other important minerals. As with any aspect of your prenatal wellness, working collaboratively with your care provider is always your best resource for personalized guidance, ensuring your choices align with your specific health needs. This collaborative approach to nutrition, much like understanding your [Choline in the second trimester](/nutrition/choline-trimester-2) needs, helps you make informed decisions for your well-being.