Constipation is one of the most common digestive concerns seen by dietitians. Whether you’re experiencing occasional constipation after travel or struggling with chronic hard stools, many people want to know if there are foods that soften stool naturally before reaching for a laxative.
The good news is that nutrition can play a powerful role in improving stool consistency. While fibre is often the first recommendation, stool softness depends on much more than fibre alone. Hydration, gut bacteria, movement, and certain nutrients all work together to keep bowel movements comfortable and regular.
In this article, we’ll explain how stool softening works, highlight the best foods that soften stool naturally, discuss foods that may contribute to constipation, and explain when supplements such as magnesium may be appropriate.
How Stool Softening Works
Stool is made up of much more than undigested food. It consists of water, dietary fibre, bacteria, digestive secretions, and waste products that gradually move through the digestive tract.
As stool travels through the colon, water is absorbed back into the body. If too much water is removed or stool moves too slowly, it becomes dry, firm, and difficult to pass.
The goal of treating constipation isn’t simply to increase the number of bowel movements—it’s to improve stool consistency so bowel movements are comfortable and complete.
Several factors influence stool softness, including:
- Adequate fluid intake
- Soluble and insoluble fibre intake
- Healthy gut bacteria that ferment fibre into short-chain fatty acids
- Regular physical activity
- Medications and underlying medical conditions
Research shows that increasing dietary fibre can improve stool frequency in many people with constipation, although fibre alone does not always completely resolve symptoms. This is why a comprehensive approach—including hydration, diet, and lifestyle—is often most effective.
10 Foods That Soften Stool Naturally
Many of the best foods that soften stool naturally work by increasing water content within the stool, supporting healthy gut bacteria, or providing soluble fibre that forms a soft gel during digestion.
1. Kiwi
Kiwi is one of the best-studied foods for constipation. Research has shown that consuming two green kiwis daily can improve stool frequency and consistency while causing less bloating than some fibre supplements.
2. Prunes
Prunes contain both fibre and the natural sugar alcohol sorbitol, which draws water into the bowel and helps soften stool. They also contain polyphenols that may support a healthy gut microbiome.
3. Pears
Pears provide soluble fibre and naturally contain sorbitol, making them one of the most effective fruits for relieving mild constipation.
4. Apples (with the skin)
Apples are rich in pectin, a soluble fibre that helps retain water in the stool and supports beneficial gut bacteria.
5. Oats
Oats are an excellent source of beta-glucan, a soluble fibre that creates a gel-like consistency in the digestive tract and helps produce softer, easier-to-pass stools.
6. Chia Seeds
When mixed with water, chia seeds absorb many times their weight in fluid, increasing stool moisture while providing fibre that supports regular bowel movements.
7. Ground Flaxseed
Ground flaxseed contains both soluble and insoluble fibre, making it an excellent addition to oatmeal, yogurt, or smoothies for improving stool consistency.
8. Legumes
Beans, lentils, and chickpeas provide a combination of soluble fibre, resistant starch, and prebiotics that nourish healthy gut bacteria while increasing stool bulk and softness.
9. Cooked Vegetables
Cooked carrots, squash, sweet potatoes, broccoli, and spinach are generally easier to digest than raw vegetables while still providing fibre and water to soften stool.
10. Yogurt and Kefir
Although not a stool softener on their own, fermented dairy products containing live probiotics may improve bowel regularity in some individuals by supporting a healthier gut microbiome.
Soluble Fibre Foods
Not all fibre behaves the same way. Soluble fibre dissolves in water to form a soft gel that helps retain moisture within the stool. This is particularly helpful for individuals with hard, dry stools.
Excellent sources of soluble fibre include:
- Oats
- Barley
- Psyllium husk
- Apples
- Pears
- Citrus fruits
- Carrots
- Sweet potatoes
- Beans
- Lentils
- Chia seeds
- Ground flaxseed
Rather than dramatically increasing fibre overnight, aim to increase intake gradually over several weeks. Most adults should aim for approximately 25–38 grams of fibre daily, while also drinking enough fluids to support fibre’s beneficial effects.
Hydrating Foods
Water plays an equally important role in preventing constipation. Even a high-fibre diet may worsen constipation if fluid intake is inadequate. Fibre needs water to work effectively. Along with drinking fluids throughout the day, many foods naturally contribute to hydration because they contain over 90% water.
Some of the best hydrating foods include:
- Watermelon
- Cucumber
- Tomatoes
- Lettuce
- Oranges
- Strawberries
- Celery
- Zucchini
- Soups and broths
Aim for approximately 1.5–2 litres of fluids daily, or more if you’re physically active, exercising regularly, or spending time in hot weather.
Foods to Avoid
No single food causes constipation, but some eating patterns can make hard stools more likely.
If constipation is an ongoing issue, consider limiting:
- Highly processed snack foods
- Fast food
- Refined grains (white bread, pastries, many crackers)
- Large amounts of cheese
- Diets very low in fruits and vegetables
- Low fluid intake
- Excess alcohol, which may contribute to dehydration
Rather than eliminating foods completely, focus on adding more fibre-rich and hydrating foods while maintaining adequate fluid intake.
When to Add Magnesium
If dietary changes alone aren’t improving constipation, magnesium supplementation may be worth discussing with your healthcare provider.
Certain forms of magnesium, particularly magnesium oxide, act as osmotic laxatives by drawing water into the intestines, producing softer stools and improving bowel movement frequency. Magnesium citrate can have a similar effect and is commonly used for occasional constipation, although it may be more likely to cause loose stools in some individuals.
Some naturally magnesium sulfate-rich mineral waters have also demonstrated improvements in stool consistency and bowel movement frequency in clinical studies. However, these products are not widely available in Canada, and some contain higher sodium levels that may not be appropriate for individuals with hypertension or heart disease.
Magnesium supplementation isn’t appropriate for everyone. People with kidney disease, significantly reduced kidney function, or certain medical conditions should consult their physician before using magnesium regularly.
If you’re experiencing chronic constipation that isn’t responding to dietary changes, working with a registered dietitian can help identify the underlying cause and determine whether magnesium, fibre supplements, or other treatments may be appropriate.
Key Takeaways
If you’re looking for foods that soften stool naturally, start by focusing on the foundations:
- Eat a variety of soluble fibre-rich foods every day.
- Include naturally hydrating fruits and vegetables.
- Drink adequate fluids throughout the day.
- Increase fibre gradually to minimize bloating.
- Stay physically active to support normal bowel function.
- Consider magnesium only when dietary strategies are insufficient and after discussing it with your healthcare provider.
For many people, consistent dietary changes provide long-term relief and help reduce reliance on stimulant laxatives.
When Should You See a Healthcare Professional?
Occasional constipation is common, but persistent constipation should always be evaluated.
Speak with your healthcare provider if you experience:
- Constipation lasting longer than three weeks
- Blood in the stool
- Unexplained weight loss
- Severe abdominal pain
- Vomiting
- A sudden change in bowel habits
- Constipation that does not improve with dietary and lifestyle changes
These symptoms may indicate an underlying medical condition requiring further assessment.
Need Help Managing Constipation?
If you’re struggling with ongoing constipation, hard stools, bloating, or digestive discomfort despite making dietary changes, you don’t have to figure it out alone. Chronic constipation can have many underlying causes—including inadequate fibre or fluid intake, medications, pelvic floor dysfunction, irritable bowel syndrome (IBS), or other digestive conditions—and the right treatment depends on identifying what’s contributing to your symptoms.
At Gut Healthy Dietitian, our registered dietitians take an evidence-based, personalized approach to constipation management. We’ll work with you to identify the root cause of your symptoms and develop a nutrition plan tailored to your lifestyle, whether that includes optimizing fibre intake, improving hydration, adjusting meal patterns, recommending appropriate supplements such as magnesium or psyllium, or coordinating care with your healthcare team when needed.
Ready to find lasting relief? Book a consultation with one of our registered dietitians today and take the first step toward healthier digestion and more comfortable bowel movements.
References
- World Health Organization. Guideline: Sodium Intake for Adults and Children. 2012.
- Yang J, Wang HP, Zhou L, Xu CF. Effect of dietary fiber on constipation: A meta-analysis. World Journal of Gastroenterology. 2012;18(48):7378-7383. https://doi.org/10.3748/wjg.v18.i48.7378
- Johanson JF. Review of the treatment options for chronic constipation. MedGenMed. 2007;9(2):25. PMID: 17955081
- Xing JH, Soffer EE. Adverse effects of laxatives. Diseases of the Colon & Rectum. 2001;44(8):1201-1209. https://doi.org/10.1007/BF02234645
- Dupont C, Hébert G. Magnesium Sulfate-Rich Natural Mineral Waters in the Treatment of Functional Constipation. Nutrients. 2020;12(7):2052. https://doi.org/10.3390/nu12072052
- Heizer WD, et al. Intestinal effects of sulfate in drinking water on normal human subjects. Digestive Diseases and Sciences. 1997;42(5):1055-1061. https://doi.org/10.1023/a:1018801522760
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