For anyone trying to lose weight, this question is an exciting one! If you simply want to know if your body burns calories warming up the water,
the answer is yes. But if you want to know if drinking a lot of ice
water can help you lose weight, or keep weight off, this "yes" needs to
be qualified with some calculations.
First of all, calories are case-sensitive. There are calories and then there are Calories. Calories with a big "c" are the ones used to describe the amount of energy contained in foods.
A calorie with a little "c" is defined as the amount of energy it takes
to raise the temperature of 1 gram of water 1 degree Celsius.
most people think of as a Calorie is actually a kilo-calorie: It takes
one Calorie to raise the temperature of 1 kilogram of water 1 degree
Celsius. So when you drink a 140-Calorie can of cola, you are ingesting
140,000 calories. There is no cause for alarm, because the conversion
applies across the board. When you burn 100 Calories jogging a mile, you
are burning 100,000 calories.
So, considering that the definition
of a calorie is based on raising the temperature of water, it is safe
to say that your body burns calories when it has to raise the
temperature of ice water to your body temperature. And unless your urine
is coming out ice cold, your body must be raising the temperature of
the water. So calories are being burned.
Let's figure out exactly what you're burning when you drink a 16-ounce (0.5 liter) glass of ice water:
The temperature of ice water can be estimated at zero degrees Celsius.
Body temperature can be estimated at 37 degrees Celsius.
It takes 1 calorie to raise 1 gram of water 1 degree Celsius.
There are 473.18 grams in 16 fluid ounces of water.
in the case of a 16-ounce glass of ice water, your body must raise the
temperature of 473.18 grams of water from zero to 37 degrees C. In doing
so, your body burns 17,508 calories. But that's calories with a little
"c." Your body only burns 17.5 Calories, and in the grand scheme of a
2,000-Calorie diet, that 17.5 isn't very significant.
But let's say you adhere to the "eight 8-ounce glasses of water a day" nutritional recommendation.
In 64 ounces of water, there are 1,892.72 grams. So to warm up all that
water in the course of a day, your body burns 70,030 calories, or 70
Calories. And over time, that 70 Calories a day adds up. So, while you
definitely shouldn't depend on ice water consumption to replace exercise
or a healthy diet, drinking cold water instead of warm water does, in
fact, burn some extra Calories!