Is drinking too much coconut water bad for health?

According to Dr. Huynh Tan Vu, University Medical Center HCMC – Branch 3, the demand for refreshment, rehydration, and cooling the body spikes during the hot season. Among natural beverages, coconut water is a popular choice for its mild sweetness and freshness and essential minerals.

Fresh coconut water consists of 95% water and is rich in electrolytes. A single 240 ml glass contains up to 600 mg of potassium (equivalent to 12% of the recommended daily intake), 57.6 mg of calcium, 60 mg of magnesium (both 10% of requirement), and 252 mg of sodium.

As a result, it helps quickly recover after exercise, cools the liver, acts as a diuretic, and quenches thirst.

Furthermore, with only 46 calories and 10 grams of natural sugar, it serves as a better alternative to carbonated soft drinks or sugar-laden bottled beverages.

But Vu points out that coconut water cannot entirely replace water. Drinking too much coconut water in a day can lead to an excess of minerals, causing electrolyte imbalances or an unwanted spike in sugar intake.

Concurring with this, his colleague Dr. Nguyen Thi Son says nutritionists recommend a maximum of 2 - 3 coconuts per week, or about 500 ml per serving. Exceeding this dosage can cause several side effects.

Drinking a large volume at once can cause bloating, with water retention in the stomach causing the abdomen to distend, she says.

An electrolyte imbalance occurs when potassium and sodium concentrations in the fall above or below the normal ranges.

Consuming coconut water constantly fluctuates potassium and sodium levels in the blood, slows down the blood flow to the heart, which leads to irregular heartbeat and, in severe cases, even cause cardiac arrest.

Drinking a lot of coconut water increases the frequency of urination, forcing the kidneys to work overtime, causing temporary swelling in renal parenchymal cells. If this persists, kidney function may decline.

Fresh coconut water is widely enjoyed during the hot season. Photo by My Y

Despite being nutrient-dense, coconut water should not be consumed indiscriminately, especially by individuals with specific body traits or underlying medical conditions.

Vu says people with a "cold" body constitution - those who frequently experience stomach chills, diarrhea, slow digestion, or reduced tolerance to cold temperatures - should avoid regular consumption of coconut water since ingesting large amounts of a beverage with cooling properties can worsen digestive disorders, leading to prolonged diarrhea.

Coconut water is also unsuitable for evening consumption. Its cooling properties and high mineral content can slow down the digestive process, causing bloating and sleep disruptions, particularly if consumed with ice or coconut meat.

Patients with kidney failure must also drink coconut water with caution, as its high potassium and sodium levels can affect the kidneys' filtration and clearance functions if consumed in excess.

Coconut water is recognized as a rich source of potassium - one of the essential nutrients for patients with hypertension. However, excessive intake can lead to a potassium surplus, lowering blood pressure and causing dizziness, lightheadedness, or even fainting.

Coconut water contains approximately 5 grams of carbohydrates per 100 ml.

So people undergoing diabetes treatment should monitor their daily intake to prevent the risk of hyperglycemia and other serious complications.

While rising temperatures during peak summer make reducing body heat essential, experts advise people to listen to their bodies and consume coconut water properly.

For those with underlying medical conditions or special health concerns, it is best to consult a physician before regularly consuming coconut water.