Research: Does Watermelon Make You Poop?

One of summer’s iconic fruits has a surprising number of health benefits, as well.

Watermelon is a sweet treat with plenty of vitamins – and it packs a hydrating punch, too, perfect for beating the heat!

But when you’re making a long trip to a family reunion, a bit of googling might make you think twice about indulging too much in this tasty snack.

Does watermelon help you poop? Does watermelon cause diarrhea? Will you regret it halfway home without a bathroom stop in sight?

On the flip side – there’s rumors that watermelon can be great for constipation.

If you’re stuck in the bathroom (or out of it), it’s tempting to think that a sweet, healthy fruit can help ease your pains.

Rest assured, my friends: we’ve done the research, and we’re here to give you the facts.


Watermelon and nutrition

First, though, let’s look at the other reasons why you might want to eat watermelon.

As far as hydration goes, it really can’t be beat; according to the USDA, 100g of edible fruit contains an average of 91g is pure water.(1)

You’ll also get 112mg of potassium, 8.1g of vitamin C, and 569 IUs of vitamin A.

Yum, right?

While it only clocks in at 30 calories per 100g serving, it does have 6.2g of sugar.

This may seem a lot, at first – its glycemic index is high for a reason! – but because it’s such a small amount in comparison to its serving size, scholars Venn and Green say its glycemic load is very low, meaning that it’s not going to cause a blood sugar spike.(2)

In fact, a 2014 study shows that watermelon seeds might be able to help treat diabetes-related complications.(3)

Not only is watermelon sweet, it’s also safe for the diabetics in your family.

Onto the nitty-gritty details, though. We did some googling, and found many sites that wrote how this delicious fruit was either good for constipation, or might cause you diarrhea:


Watermelon, lycopene, and diarrhea

woman with a fruit outside

One article, LiveScience, states that one of the antioxidants found in watermelon, lycopene, can cause diarrhea if more than 30mg is consumed a day.(4)

They linked to a general page of the American Cancer Society – but while the website mentions there is some risk associated with taking too much as a supplement, neither the American Cancer Society, nor the lycopene page of MedlinePlus, mentions such a side effect.

Moreover, the 30mg daily limit stated doesn’t quite add up – the MedlinePlus page states that 120mg supplements have been taken daily for a year with no adverse side effects.

Where did this rumor start, then?

Numerous studies on the relationship between lycopene and colon cancer show a small number of participants dropped out due to reactions like diarrhea, but this might simply be because of a lycopene allergy.

Emily DeLacey, a registered dietician, has suggested there is a potential for digestive issues, nausea, or diarrhea with a lycopene sensitivity, though most of the related information is about tomatoes, since they have more lycopene in them than watermelon per serving.(5)

That’s it, though.

Lycopene isn’t the culprit we’re looking for.


Does watermelon have sorbitol?

young man offers watermelons

This site by Stylecraze is full of misconceptions we’ve already disproved, from lycopene to diabetes, but they also mention that watermelon has sorbitol, a sugar linked diarrhea.(6)

They aren’t the only ones to claim this, either – that watermelon contains sorbitol – but let’s see what the science has to say!

According to MedlinePlus, sorbitol is a sugar alcohol that, while containing about half the calories of regular sugars, can also cause stomach cramps and diarrhea in some people.

If sorbitol were present in watermelon, it might be the reason behind why it makes people poop.

However, while sorbitol is found in some fruits, a 2014 study shows that watermelon doesn’t have any detectable amount of the poop-inducing sugar.(7)

Rather, watermelon has sucrose, glucose, and fructose.

Of the three, sucrose is the most likely to cause an issue, but those who experience problems in their bowels most likely have an uncommon sucrose intolerance caused by a lack of sucrase, the enzyme used to break sucrose down, in the body.

If you suspect you have a sucrose intolerance, be sure to speak to your doctor.


The water in watermelon

Finally, we have the claims from websites like LittleThings, which boldly claim that watermelon makes you poop.(8)

Their reasoning?

Watermelon has no dietary fiber (which is wrong – it has 1.1g per 100g serving) and a lot of water. Basically, since watermelon is like drinking a glass of water, it’ll help you poop better.

I don’t think we need to explain where the problem with that one is.

Make sure you’re hydrated, and you’ll probably have less problems in the bathroom!


Other natural ways to relieve constipation

Toilets Sign

So what are some other natural ways to relieve constipation? has some great recommendations.

The easiest way, as mentioned earlier, is to drink some water, as it’s necessary to making easy-to-pass stools and regular bowel movements.

Eating consistently (don’t skip meals!) and teaching your body to expect a good poop at a certain time every day – like after breakfast or dinner – can also help you pass more pleasantly.

Regular physical activity may also help keep you regular.

Try methods like slowly introducing fiber into your diet. Too much at once can cause cramps and bloating, but getting regular fiber from whole grains, beans, and figs will help move things along.

Fruits with fiber in them – berries, peaches, apricots, plums, raisins, rhubarb, and prunes – can be a great in-the-moment fix, as well.

Pro tip: just be sure to leave the skin on, as that’s where most of the fiber is stored (assuming that the skin is edible).

In the moment, though, the best way to relieve constipation is to talk to your doctor.

Constipation can get serious if left untreated, so be sure to keep good track of your bowel movements, and let your primary care physician know if something is up.

While you’re waiting, though, be sure to avoid greasy, processed foods, as those can hold things up.


Conclusion: Does watermelon make you poop?

All in all, if you’re looking to avoid a pooping problem from eating too much watermelon, be of good cheer: watermelon will not lead you to the toilet.

If you’re looking for something to alleviate your constipation, the best start is to talk to your general health provider.

Happy pooping!