10 Major Side Effects Of Eating Too Many Watermelons

Watermelon is a delicious fruit that grows on a tree of the same name. It belongs to the Cucurbitaceae family and is related to cucumber, squash, and pumpkin, etc. They are considered as both fruit and vegetable. Vitamins, minerals, antioxidants, and dietary fibers, etc in watermelon provide many health and beauty benefits. However, there are also some side effects of eating too many watermelons.

Side Effects Of Eating Too Many Watermelons

Following are the major side effects of eating too many watermelons.

watermelon side effects

(1) May Cause Internal Internal Disturbances

Lycopene, a carotenoid phytonutrient in watermelon strengthens our bones, provides anti-inflammatory benefits, and reduces the risk of various cancers.

However, an excess amount of lycopene may cause nausea and other digestive problems like bloating, diarrhea, vomiting, indigestion, and flatulence, etc.

Eat watermelon in moderation to avoid the risk.

(2) May Cause Cardiovascular Problems

Watermelon is good for our heart health as they contain antioxidants and relevant compounds such as lycopene that protect our cardiovascular system from free radical damage.

Watermelon manages cholesterol and reduces the risk of atherosclerosis, a condition that hardens and narrows our arteries due to the accumulation of plaque and fat deposits in the arterial walls.

It is a leading cause of cardiovascular problems like heart attack, heart stroke, and coronary artery disease.

Watermelon contains potassium, a natural vasodilator that relaxes blood vessels, improves blood circulation, and provide relief from hypertension, a 

However, too much potassium may drop our blood pressure below the healthy range and give rise to cardiovascular problems like weak pulse, irregular heartbeat, and cardiac arrest. It may also affect the functioning of the nervous system. 

(3) Watermelon And Diabetes

Despite having a high glycemic index of 80, watermelon help in managing diabetes as it is low in carbohydrates and has a glycemic load of 5.

Because of its low carbohydrates level, watermelon doesn’t cause a sudden spike in blood sugar level and helps in managing diabetes. 

Dietary fibers in watermelon slow down the rate at which sugar is absorbed by the bloodstream and keep blood sugar under control.

However, overeating watermelons may disrupt our blood sugar levels as they are rich in natural sugars.

Excessive consumption of watermelon may increase the risk of high blood sugar and give rise to symptoms such as increased thirst, frequent urination, fatigue, nausea and vomiting, shortness of breath, stomach pain, and dry mouth, etc. 

If you take diabetes medication, eat watermelon after consulting with your doctor and ensure there is no risk of food-drug interference. 

  10 Benefits And Side Effects of Onion Tea

(4) May Drop Blood Pressure

The vasodilating properties of potassium in watermelon relax our blood vessels, improve blood circulation, and provide relief from hypertension or high blood pressure.

Hypertension or high blood pressure is a silent killer that increases the risk of cardiovascular and other health problems. 

Eat watermelons moderately as otherwise they may drop blood pressure below the healthy range and cause fainting, nausea, trouble breathing, dizziness, irregular heartbeat, blurred vision, dehydration, pale skin, and lack of concentration, etc. 

Consult your doctor before eating watermelons while being on blood pressure medication, and ensure there is no food-drug interference. 

(5) May Cause Allergies

Avoid watermelon if you are allergic to watermelon as it may cause mild rashes, anaphylaxis, and facial swelling. 

You are more likely to be allergic to watermelons if you are allergic to carrots, latex, or cucumber. 

(6) Eating Watermelon During Pregnancy And Nursing

Natural sugars in watermelon may cause and worsen the risk of gestational diabetes during pregnancy.

Watermelon may also interact with other medications prescribed by the doctor during pregnancy.

Consult your doctor before eating watermelons during pregnancy, and ensure there is no risk involved. 

  7 Major Side Effects of Eating Too Many Wood Apples

(7) May Cause Digestive Problems

Dietary fibers and abundance of water ( around 92 percent) in watermelon improve our bowel movement and relieve constipation.

However, watermelon also contains Sorbitol, a natural sugar that may cause digestive problems like bloating, abdominal pain, and flatulence, etc. 

To avoid the risk, eat watermelons moderately. 

(8) Arginine Side Effects

Watermelon contains arginine, an amino acid that improves sexual health and provides other benefits such as relieving chest pain, preventing inflammation, regulating high blood pressure, and so on.

However, overeating watermelon may increase the arginine level in our body.

In large doses, arginine may cause abdominal pain, bloating, diarrhea, gouts, allergies, and worsen asthma symptoms.

  11 Benefits And Side Effects of Magnesium

(9) May Cause Overhydration

Our body needs water for various biochemical activities. Our body is made up of about 70 percent water, and some vital organs like the liver and kidneys are more than 80 percent water. 

Watermelon has an abundance of water ( about 92 percent) and fulfills our body’s need for hydration.

However, overconsuming watermelon may overhydrate our body and dilute the level of essential nutrients and mineral salts such as potassium and magnesium, etc.

It may increase the risk of water retention which may cause swelling in the legs, and increase the risk of fatigue with people with weak kidneys. 

(10) Not Suitable For People Suffering From Hyperkalemia

Overeating watermelons may raise potassium levels in our body, and increase the risk of hyperkalemia

It may cause cardiovascular problems like irregular heartbeat, weak pulse, cardiac arrest, and poor nerve health. 

High potassium level is bad for people suffering from kidneys, and they should be cautious of the same.


The information contained in the post is for general purpose only and shouldn’t be considered as medical advice or as an alternative to medical advice. Although I’ve tried my best to keep the information contained in this post as accurate and updated as possible, I make no guarantee of the accurateness of the same.

P.S- Consider sharing this post, if you find it useful and/or interesting.

Scroll to top