Think of your body like a very expensive, very stubborn thermostat. It has zero interest in letting you freeze from the inside out. The process of warming water—called thermogenesis—is real, but your body is insanely efficient. It wastes almost no energy doing this job. Your liver and kidneys aren’t sweating over a tiny glass of ice cubes. They’re more like grumpy clerks: “Fine, we’ll warm it up. Now stop bugging us.”
A study from 2003 (yes, people get paid to study this) found that drinking 500 ml of cold water increased calorie burn by a whopping 24 to 30 calories over 90 minutes. That’s less than the calories in a single Hershey’s Kiss. To lose one pound of fat (3,500 calories), you’d need to drink 117 glasses of ice water. You’d also need a bathroom the size of a small country.
Burning Calories With Ice Water: Fact Or Fiction? | CPR First Aid
The “Ice Diet” Would Be Hilarious (And Horrible)
Let’s imagine you actually tried to live on an “ice water diet.” You’d spend your entire day shivering, peeing, and explaining to your coworkers why you smell faintly of freezer burn. You’d also risk something called hyponatremia—overhydration that dilutes your blood’s sodium levels. That can cause nausea, headaches, and in extreme cases, your brain swelling up like an angry balloon. So, maybe don’t do that for the sake of four extra calories.
But here’s the fun part: drinking any water—cold or warm—helps you manage weight. It fills your stomach, making you feel fuller so you eat less at meals. It also boosts your metabolism by about 24-30% temporarily, but that’s from the act of hydrating your cells, not from freezing them. So the real villain isn’t temperature; it’s dehydration. Your body hates that more than a cold drink.
If you want a genuinely fun fact: chewing on ice cubes burns marginally more calories than drinking them. Why? Because your jaw muscles have to work. But don’t get excited—you’d need to munch ice for about four hours to burn the calories from one Oreo. Plus, your dentist will send you a very angry bill for chipped enamel. Stick to water. Your teeth will thank you.
Burning Calories | CPR First Aid
