Ice-cold water boosts metabolism but may cause discomfort

On World Water Day 2025, many are curious about the effects of drinking ice-cold water. Some believe it helps burn calories, while others worry about its health risks, especially regarding digestion. Drinking cold water is thought to boost metabolism, as the body uses energy to warm it. A study showed that drinking about 500 milliliters of cold water can increase metabolic rate by around 30% for one hour. However, the calorie-burning effect is minor, roughly 17 calories, which is not significant for weight loss. Ice-cold water does have some benefits. It may improve exercise performance in hot conditions and help keep you alert. Many people also find it easier to stay hydrated when drinking cold water. However, there are potential downsides. Cold water can slow digestion by constricting blood vessels in the stomach. It may trigger migraines in some individuals and worsen cold symptoms, like a stuffy nose or sore throat. Additionally, quickly drinking very cold water can cause "brain freeze," a sharp headache. Ultimately, whether to drink ice-cold water is a personal choice. It offers some perks, but it is not a miracle for weight loss. Those with certain health issues may want to choose warmer water instead.