musicianman
07-13-2009, 01:08 AM
EDIT:
See this thread; there's no point in having two.
http://forum.bodybuilding.com/showthread.php?t=117656121
in10city
07-13-2009, 02:07 AM
No need to make up theories.
http://jcem.endojournals.org/cgi/content/full/92/8/3334
http://jcem.endojournals.org/cgi/content/full/88/12/6015
http://jcem.endojournals.org/cgi/content/full/91/9/3598
nano.ix
07-13-2009, 03:44 AM
they talked about this on a tv show and they pointed out that you would only burn 7 pounds yearly by drinking the eqiv. of a huge fish tank ... then they pointed out that they burned the same amount of calories just talking in the 30min show.
dont know if it is 100% true, but the conclusion sure is
AbAbber2k
07-13-2009, 06:19 AM
Your math LOOKS solid (course I'm no scientist) but I think there are other factors which reduce the actual benefit significantly.
I've seen this discussed MANY times before and I seem to recall the actual number to be more like 5-10cal per cup. In other words you might burn a little over an extra pound a month at best. However, judging by these articles, even that may be over estimating the benefit.
From the 3rd link that in10city provided:
"Cooling the water before drinking only stimulated a small thermogenic response, well below the theoretical energy cost of warming the water to body temperature. These results cast doubt on water as a thermogenic agent for the management of obesity."
The study noted a meager 4.5% increase in energy expenditure over the 60min following ingestion of 2cups of 3C water. If you're burning 3000cal per day, thats 125 per hour... which gives you a paltry 5.6 extra calories burned. Multiply that by 8 (16cups per gallon) and you've got 45 calories burned per day due to drinking icewater. Thats only five pounds over the course of a year.
Now ice-water guzzling enthusiasts will point out that 5lbs is pretty significant. And it is. Except that its only going to matter to those people tightly controlling their diets for TWELVE MONTHS STRAIGHT. I'm still going to tell someone to drink one less Pepsi a day before I start advising them to carry around a bucket of ice-water.
Still, if you're on a cut it won't hurt. And if you've got a ready supply of freezing cold water on tap at all times... go for it.
Robby Coker
08-02-2009, 04:48 PM
Your math LOOKS solid (course I'm no scientist) but I think there are other factors which reduce the actual benefit significantly.
I've seen this discussed MANY times before and I seem to recall the actual number to be more like 5-10cal per cup. In other words you might burn a little over an extra pound a month at best. However, judging by these articles, even that may be over estimating the benefit.
I found this page a while back. Here, it says that ice water burns 25 Calories per glass, whereas, room temp water burns 16.
http://stanford.wellsphere.com/exercise-article/8-foods-to-boost-your-metabolism/538210
Is the 5-10 Caloric value you mention the difference between the ice water and the room temp water?
In Total Metabolism Forecaster, I have a section for water intake where you enter a parameter for the amount of water that you drink regularly.
Currently, in the functions for it, I use the average of those figures (from the above page) of the ice water and room temp water, which comes to 20.5.
I have 48 oz., which is likely average water intake, set as the base or median. Any amount you enter below this gives a negative %, which is a decrease in metabolism (by 20.5 Calories per cup less than 48 oz.), as dehydration is a debility to your metabolism.
On the other hand, an amount you enter above 48 oz. gives an increase (positive %) as drinking more water is shown to raise metabolism. Here, this is by 20.5 Calories for every 8 oz. above 48 oz. The cap for metabolic increase is based on max recommended water intake, which is based on total body weight or LBM (if body fat % is known). So, the less you weigh and the less LBM you have, the less increase in metabolism you get from drinking more water.
From the 3rd link that in10city provided:
"Cooling the water before drinking only stimulated a small thermogenic response, well below the theoretical energy cost of warming the water to body temperature. These results cast doubt on water as a thermogenic agent for the management of obesity."
The study noted a meager 4.5% increase in energy expenditure over the 60min following ingestion of 2cups of 3C water. If you're burning 3000cal per day, thats 125 per hour... which gives you a paltry 5.6 extra calories burned. Multiply that by 8 (16cups per gallon) and you've got 45 calories burned per day due to drinking icewater. Thats only five pounds over the course of a year.
Now ice-water guzzling enthusiasts will point out that 5lbs is pretty significant. And it is. Except that its only going to matter to those people tightly controlling their diets for TWELVE MONTHS STRAIGHT. I'm still going to tell someone to drink one less Pepsi a day before I start advising them to carry around a bucket of ice-water.
Still, if you're on a cut it won't hurt. And if you've got a ready supply of freezing cold water on tap at all times... go for it.
I'm currently working on the next version of Total Metabolism Forecaster.
So, I will take a look at these studies posted in this thread, and depending on what I find as far as metabolic changes linked to higher water intake, I might do some modifications to the water intake section.