GLP-1 Constipation: Why It Happens and How to Find Relief

One of the most common, and admittedly least glamorous, side effects of GLP-1 medications like semaglutide and tirzepatide is constipation.

If you've recently started a GLP-1 medication and noticed that you're going to the bathroom less often or having harder, more difficult bowel movements, you're certainly not alone. Constipation is one of the most frequently reported digestive side effects during the first several weeks of treatment.

The good news is that for many people, constipation improves as the body adjusts to the medication. In the meantime, there are several simple lifestyle changes that can help keep your digestive system moving comfortably while allowing you to continue benefiting from your treatment.

What Is Constipation?

Constipation is generally defined as having fewer than three bowel movements per week, but frequency isn't the only sign. You may also experience:

• Hard, dry stools

• Straining during bowel movements

• A feeling that you can't completely empty your bowels

• Abdominal bloating or discomfort

• Painful bowel movements

While occasional constipation is common, persistent constipation shouldn't be ignored— especially if it's accompanied by severe pain or other concerning symptoms.

Why Do GLP-1 Medications Cause Constipation?

GLP-1 stands for glucagon-like peptide-1, a hormone your body naturally releases after eating.

GLP-1 medications work by mimicking this natural hormone, which helps regulate blood sugar, signals to your brain that you're full, and slows the rate at which food leaves your stomach.

Because food moves more slowly through your digestive tract, your body has more time to absorb water from your stool. As more water is removed, stools become firmer, drier, and more difficult to pass.

Many people also eat significantly less after starting a GLP-1 medication. While this is expected, eating less often means less food moving through your digestive tract, which can further slow bowel movements.

A calorie deficit requires closer attention to your nutrition habits. If you need guidance, we have an article on how to eat in a calorie deficit without feeling hungry or compromising your health.

The result is a perfect storm: slower digestion, less food moving through the intestines, and drier stools.

Fortunately, there are several ways to help keep your digestive system working smoothly.

Stay Well Hydrated

Hydration is one of the most effective ways to prevent and relieve constipation.

Since your intestines naturally pull water from waste as it moves through your digestive tract, drinking enough fluids helps keep stool softer and easier to pass.

Aim for approximately:

• Women: 65-95 ounces of fluids per day

• Men: 100-125 ounces of fluids per day

Your needs may be higher if you exercise regularly, spend time outdoors in hot weather, or perspire heavily.

If plain water is difficult to drink, try adding lemon, cucumber, berries, or sugar-free electrolyte packets for flavor. Many people also find that carrying a reusable water bottle makes it easier to stay consistent throughout the day.

It's also helpful to limit excess alcohol and caffeine, both of which can contribute to dehydration if they replace water throughout the day.

Eat More Fiber Gradually

Fiber plays a major role in digestive health by adding bulk to stool and helping it move more efficiently through your intestines.

Good sources of fiber include:

• Fresh fruits

• Vegetables

• Beans and lentils

• Oats

• Whole grains

• Chia seeds

• Ground flaxseed

Most adults should aim for approximately 25–35 grams of fiber each day.

However, more fiber isn't always better if you increase it too quickly.

If your body isn't used to eating a high-fiber diet, suddenly doubling your fiber intake can actually cause bloating, cramping, and gas. Instead, increase fiber gradually over several days or weeks while also increasing your water intake.

Simple swaps can make a big difference:

• Choose whole grain bread instead of white bread.

• Replace refined pasta with whole wheat or legume-based pasta.

• Snack on whole fruit instead of fruit juice.

• Add vegetables to meals whenever possible.

Fiber works best when paired with adequate hydration. Without enough water, fiber can actually worsen constipation.

Don't Skip Healthy Fats

When people begin trying to lose weight, they often assume that eating as little fat as possible is the healthiest choice. In reality, your body still needs healthy fats, and eating too little may actually contribute to constipation.

Healthy fats help support normal digestion, encourage bowel regularity, and allow your body to absorb important vitamins like A, D, E, and K. They also help meals feel more satisfying, making it easier to stick with healthy eating habits without feeling deprived.

Try including a moderate serving of healthy fat with your meals, such as:

• Avocados

• Olive oil

• Nuts and seeds

• Natural nut butters

• Butter and whole-fat dairy

• Chia seeds or ground flaxseed

• Salmon and other fatty fish

Remember that healthy fats are calorie-dense, so portion size still matters. A balanced meal that includes lean protein, fiber-rich carbohydrates, healthy fats, and plenty of fluids supports both weight loss and healthy digestion.

Prioritize Balanced Meals

Many people taking GLP-1 medications unintentionally eat too little because their appetite is greatly reduced.

Instead of skipping meals, focus on eating balanced meals that include lean protein, fiber-rich foods, healthy fats, and plenty of fluids throughout the day.

For a deeper dive into GLP-1 nutrition, take a look at our complete nutrition guide for GLP-1 patients.

Even though portions are smaller, nourishing your body consistently helps maintain digestion, preserve muscle mass, and support sustainable weight loss.

Keep Moving

Exercise benefits nearly every system in your body, including your digestive tract.

Regular physical activity stimulates the muscles of your intestines, helping food and waste move through your system more efficiently.

Current guidelines recommend at least 150 minutes of moderate-intensity exercise each week, which could include walking, cycling, swimming, strength training, or whatever gets you inspired to move.

You don't have to complete all 150 minutes at once. Even a short walk after meals can encourage healthy digestion.

Slow Down and Listen to Your Body

GLP-1 medications change how quickly your stomach empties, so your eating habits should change, too.

Eating too quickly or consuming large meals can increase digestive discomfort, nausea, bloating, and constipation.

Instead:

• Eat slowly.

• Take small bites.

• Chew food thoroughly.

• Stop eating when you feel comfortably satisfied, not overly full.

Learning to recognize your body's new fullness signals can make your transition onto GLP-1 medications much more comfortable.

When Lifestyle Changes Aren't Enough

Sometimes lifestyle adjustments alone aren't enough to relieve constipation.

If lifestyle interventions fail, over-the-counter MiraLAX® (polyethylene glycol 3350) is generally considered a safe option for most adults when used according to package directions.

Some people also find probiotics helpful for supporting digestive health. While research is still evolving, foods containing live cultures may promote a healthy gut microbiome. Consider incorporating:

• Yogurt with live cultures

• Kefir

• Kimchi

• Sauerkraut

• Kombucha

If constipation becomes a recurring issue, talk with your healthcare provider before relying on laxatives long term.

When Should You Contact Your Healthcare Provider?

Although constipation is common, certain symptoms require medical evaluation.

Contact your healthcare provider if:

• Constipation lasts several weeks despite lifestyle changes.

• Over-the-counter treatments aren't helping.

• You haven't had a bowel movement for several days.

• You develop severe abdominal pain or significant bloating.

• You cannot pass gas.

• You notice blood in your stool.

• You experience persistent vomiting.

In rare cases, severe constipation may indicate a bowel obstruction or another serious digestive condition that requires prompt medical attention.

If you have a long history of severe chronic constipation before starting GLP-1 therapy, be sure to discuss this with your healthcare provider before beginning treatment.

A good telehealth weight loss program should include access to your provider so that you can quickly address problems that may arise.

The Bottom Line

Constipation is one of the most common side effects of GLP-1 medications, but it's usually temporary and often improves as your body adjusts.

Simple habits like drinking more water, gradually increasing fiber, including healthy fats, staying physically active, eating balanced meals, and slowing down at mealtimes can make a significant difference in keeping your digestive system moving comfortably.

Remember that GLP-1 medications are a tool, not a magic solution. Building healthy habits alongside your medication not only helps minimize side effects but also creates the foundation for long-term, sustainable weight loss.

If you're considering a GLP-1 medication or have questions about managing side effects, our team is here to help. Schedule a free consultation to learn whether our personalized weight loss program is right for you.