Over at another question I commented that cold water is traditionally thought to be hard on digestion. I wrote "Drinking ice water is a ridiculous idea that is uniquely american. Enzymes work in a very narrow temperature range so if you throw cold fluids on them it headers their ability to perform. This forces the digestive tract to use energy heating food rather than digesting it."
This prompted Dr. The Quilt to respond with a study that showed that cold water increases full body metabolism.
Me: "Just because it increases metabolism doesn't mean it's a good thing. I didn't say it doesn't increase metabolism. What I was saying is that it is a stupid way to increase metabolism. Stressing the gut so the body freaks out so that it can digest doesn't sound like a good idea to me and a lot of traditional medicine agrees with that diagnosis. Reams of n=1 also confirm this."
Jack/Dr. Quiltness: "you said it was an American thought......it was german. And it works too. You can call BS if you choose but it works. Many studies have confirmed this too. NASA showed that 40 degree water is the ideal water temp for their training for spacewalk weight loss prevention...Nasa actually heat water up in space because of this. The astronauts shred weight in space like mad. So any savings they look for so they do not have to send up more payload on trips requiring long space exposures"
Me: Cooling your digestive track shouldn't be a weight loss strategy. Not because it doesn't cause weight loss but because it interferes with digestion both by moving enzymes outside of their optimal temperature range and by causing vasoconstriction in the GI. In the short term it might not be a bloody huge deal but long term it can wreak havoc on the gut. And what I said was that drinking ice water is more of an American culture idea not that Germans didn't do studies on it.
Primallykosher: I would think the food would warm up in the stomach anyway.
Me: yeah, it doesn't seem like a big deal at first glance. Most people already have a low core temp. Throw a bolus of cold on top that and you're stressing the core temp even more often. There is very little research out there that I can find on the bodies ability to warm cold food so I've got to go with physiological plausible mechanisms and n=1 stories. Try removing cold from your diet and see if your digestion improves. Easiest thing the world to try and 3000 years of Chinese medicine will support your decision to try it. They'd actually prefer that you only drink liquid body temperature and above but I'm a bit of softy and am not an oriental medicine doc so I allow room temperature beverages into my body.
What side of the fence do you fall on?