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Upon entering after exposure to extreme heat, the body temperature is raised, blood vessels are dilated for cooling, and the blood system is overactive. Drinking ice-cold water will create an abrupt change in temperature, leading to some undesirable reactions.

The quick cooling can lead to constriction of blood vessels, particularly in the throat and stomach. This can temporarily reduce circulation, prevent rapid rehydration, and cause cramps or discomfort. The digestive enzymes are more active in warm temperatures; when they are suddenly exposed to cold, this can cause a sore throat, indigestion, or bloating.

At the worst, the result of this thermal shock could be the heart becoming strained or triggering a vagal response that causes dizziness, but unfortunately, there are myths: a severe condition such as fainting or stroke seldom happens. It is traditional wisdom that has been passed on through the centuries, particularly in hot climates such as India, to wait 10-15 minutes before drinking water (which should be lukewarm or at room temperature) for safer rehydration.

Better alternatives: Let body cool down slowly, and slowly consume normal water. If necessary, add electrolytes. This way, you absorb faster and won't burden your organs needlessly. Reduce the risk and get water smart this summer—little changes for a big impact on health.