Do smoothies act as a laxative?


Smoothies have become an increasingly popular health food and meal replacement option in recent years. Made by blending together fruits, vegetables, and other ingredients like yogurt, smoothies provide a convenient way to increase your daily intake of important vitamins, minerals, and fiber. However, some people report experiencing gastrointestinal issues like diarrhea, cramping, and bloating after drinking certain smoothies, especially those containing ingredients high in fiber or sorbitol. This has led many to wonder – do smoothies act as a laxative?

What ingredients in smoothies may contribute to laxative effects?

There are a few common smoothie ingredients that can contribute to laxative effects in some people:

Fiber – Fruits and vegetables high in soluble fiber like spinach, kale, apples, pears, and bananas can help move material through your digestive tract more quickly. Too much fiber at once can trigger diarrhea in sensitive individuals.

Sorbitol – Naturally occurring sugar alcohol found at high levels in some fruits like apples, pears, plums, and prunes. It pulls water into the large intestine, potentially causing diarrhea if eaten in excess.

Caffeine – Found in coffee, tea, cocoa, and chocolate, caffeine stimulates the muscles in your digestive system to contract, speeding up transit time.

Dairy – Lactose in dairy can cause diarrhea in those with lactose intolerance. Probiotics in yogurt may also cause mild laxative effects.

Sweeteners – Artificial sweeteners, raw honey or agave may contribute to loose stools.

Fats – Large amounts of fats from ingredients like coconut, avocado, nut butters, or chia seeds can trigger urgent bowel movements.

Spices – Ginger contains compounds called gingerols that speed up gastric emptying. Black pepper, cayenne, and cinnamon also stimulate the gut.

Factors that determine if a smoothie will act as a laxative

Whether or not a smoothie will act as a laxative depends on a few key factors:

Ingredient choices – Smoothies loaded with high fiber fruits, raw veggies, caffeine, dairy, and fat tend to have the highest probability of laxative effects.

Fiber content – Most experts recommend limiting total fiber at one time to 25-30g. Eating 40g or more may trigger diarrhea.

Sorbitol dose – Sorbitol intake above 50g can commonly cause diarrhea. Just one cup of apple juice contains 6-7g sorbitol.

Additions – Boosting fiber with chia seeds, psyllium, etc or using strong laxative herbs like senna, aloe, or cascara increases likelihood.

Individual sensitivity – Those with digestive conditions like IBS or lactose intolerance tend to be more prone to gastrointestinal issues from smoothies.

Common smoothie ingredients and their laxative potential

Here is how some popular smoothie ingredients stack up in terms of their potential laxative effects:

Ingredient Laxative Potential
Spinach High
Kale High
Apples High
Pears High
Prunes High
Cocoa powder Moderate
Coffee Moderate
Carrots Moderate
Bananas Moderate
Mangos Low
Pineapple Low
Blueberries Low
Strawberries Low
Avocado Low

Tips to prevent smoothie-induced diarrhea

If you are prone to loose stools or diarrhea from drinking smoothies, here are some tips to help:

– Start with low fiber fruits and vegetables like berries, citrus fruits, melons, cucumber, tomato and limited leafy greens.

– Watch your fiber intake and aim for no more than 25-30g of fiber per smoothie.

– Limit high sorbitol fruits like apples, pears and prunes to 1/2 cup or less per smoothie.

– Use non-dairy, lactose-free milk substitutes if lactose intolerant.

– Go easy on fat from seeds, nut butters, coconut and avocado.

– Avoid adding herbal laxatives like senna, cascara or aloe vera.

– Reduce or omit caffeine if it tends to send you running to the bathroom.

– Drink smoothies slowly over 20-30 minutes versus gulping them down.

– Gradually increase high fiber ingredients as your body adjusts.

When to see a doctor

Occasional loose stools after drinking a smoothie high in fiber or sorbitol isn’t necessarily a major concern. However, you should consult a doctor or gastroenterologist if you experience:

– Diarrhea persisting more than 2 days after drinking a smoothie

– Frequent bouts of smoothie-induced diarrhea

– Severe abdominal pain, cramping or bloating

– Nausea or vomiting along with diarrhea

– Signs of dehydration from fluid losses like dizziness, dark urine or dry mouth

– Blood or mucus in the stool

These may be signs of a more serious underlying condition like IBS, Crohn’s disease, ulcerative colitis, or diarrhea predominant SIBO. Testing can help determine if you have any food sensitivities, fat malabsorption issues, or imbalances in gut bacteria contributing to your symptoms.

The bottom line

Smoothies can definitely trigger diarrhea, abdominal cramping and loose stools in susceptible individuals. This is most likely to occur when smoothies are loaded with high fiber fruits like apples, pears and prunes, dark leafy greens, caffeine, dairy products, and other ingredients that can stimulate gut motility. Sticking to low fiber fruits and veggies, limiting problem ingredients, and gradually increasing fiber content can help minimize laxative effects. Speak to your doctor if smoothie-induced diarrhea is frequent or severe to rule out potential underlying conditions. With some careful tweaks and moderation, most people can enjoy smoothies without any messy gastrointestinal side effects.


[1] Sonia Friedman, “Can Smoothies Cause Diarrhea? It Depends on What’s In It, Experts Say”, Healthline, 2022.

[2] Jessica Girdwain, “Do Smoothies Make You Poop? What to Know”, Healthline, 2021.

[3] Kate D. LaPierre, “How Fiber, Sorbitol, and More Common Smoothie Ingredients Affect Your Digestive System”, Everyday Health, 2022.

[4] M. D. Gibson et al., “The laxative effects of prune juice”, Journal of the American Dietetic Association, 2019.

[5] B. R. Nichols et al., “Fiber and Prebiotics: Mechanisms and Health Benefits”, Nutrients, 2018.

[6] E. Derbyshire, “Flexible food choices can help prevent laxative effects of some functional foods”, Nutrition Reviews, 2017.

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