Why diabetics should strictly avoid coconut water in summer

As Bengalureans are already feeling the heat of summer, hydration is key. While normal people can consume liquids to keep hydrated, the biggest challenge is for diabetics as they cannot drink all the liquids like normal people. Dietician Dr T Ramalakshmi from Vasavi Hospitals stressed the importance of proper hydration for diabetics. She said, "As dehydration can lead to electrolyte imbalances, acute gastroenteritis, loose stools, and even kidney issues. Moreover, diabetic patients experience excessive thirst and frequent urination due to polyuria symptoms."


She said that diabetics except cardiac patients need to consume two to three liters of water daily. "Diabetics can consume buttermilk, lime water with salt, and cucumber slices can help maintain hydration. While most fruits should be avoided, watermelon in controlled portions (100-150 grams once a day), oranges, and mosambi are permissible as they have high water content.The other options could be soups or ganji can also be beneficial."


What to avoid:

She said, "Fruit juices, tender coconut water, and jaggery-based drinks due to high sugar content. There is also a need to avoid excessive coffee, tea, and herbal decoctions (kashaya) as they can increase acidity. Lime juice in hot water should be avoided; it is best consumed in normal water."


She said that fenugreek water is recommended, but the seeds should be chewed after soaking overnight, as it contains mucilage and antioxidants, making it more beneficial than cumin (jeera) water.


She said that people, especially diabetics should ensure that there is no dehydration as it can cause fatigue and kidney injury, which can be detected through blood tests. "Diabetics must stay well-hydrated to prevent complications and ensure overall well-being during the summer months. Diabetics can also consume ragi malt mixed with plain water or butter milk can be consumed", she added.

Words of caution:
Coconut water might seem like the perfect summer drink—cooling, natural, and refreshing—but if you’re diabetic, it’s something to sip with caution. While it’s often marketed as a healthy, hydrating beverage, coconut water contains natural sugars that can raise blood glucose levels, especially when consumed in large quantities.

One tender coconut can have around 6–8 grams of sugar depending on its size and maturity. For someone managing diabetes, this spike in natural sugar can throw off blood sugar control, particularly if it’s not paired with any fiber, fat, or protein to slow down absorption.

Also, the summer heat makes people drink more fluids, and diabetics might unknowingly consume too much coconut water, thinking it’s guilt-free. Unlike plain water, coconut water has a glycemic impact, and repeated intake can cause blood sugar levels to gradually rise through the day.

That said, a small amount—like 100–150 ml occasionally—may still be okay if your sugar levels are stable. But it’s always best to consult a doctor or dietitian before making it a regular part of your summer hydration routine. When in doubt, plain water or unsweetened herbal drinks are safer, blood sugar-friendly options to beat the heat.