There’s nothing quite like an ice-cold glass of water on a sweltering summer afternoon. That immediate, brain-freeze-inducing rush feels like a superpower against heat and fatigue.
Scientifically, cold water may slightly boost your metabolism because your body burns a few extra calories to warm it up. However, the effect is modest—about 4 to 7 calories per glass, so don’t trade your workout for a pitcher of ice just yet.
Some research suggests cold water is best during or after intense exercise. It helps cool your core temperature faster and can make you feel more hydrated during a sweat session, helping you drink more overall.
But there’s a catch: if you have a sensitive stomach or suffer from migraines, that icy blast can trigger discomfort or even a headache. For some people, cold water also slows down digestion by constricting blood vessels in the gut.
A Fun Cultural Reality Check
Walk into a restaurant in the United States, and you’ll almost automatically get a glass of water filled with ice. It’s so normal that we rarely question it.
Now hop over to China, Japan, or India, and the default is often warm or room-temperature water, even in summer. In Traditional Chinese Medicine, cold water is seen as a shock to the system—like putting ice cubes on a warm engine.
Whether you call it habit or wisdom, these cultural norms shape how our bodies feel about temperature. Your grandma’s insistence on “no cold drinks” might have centuries of tradition behind it.
