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Does food/beverage tempurature effect digestion? Is cold water bad for digestion?

by (5232)
Updated about 5 hours ago
Created February 20, 2012 at 6:46 PM

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?

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10044 · March 01, 2012 at 6:23 AM

I don't know Stabby, Jules can be a riot at times.

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8255 · February 29, 2012 at 11:10 PM

You know, I used to drink cold water like you, but then I took an arrow in the knee...

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9812 · February 29, 2012 at 7:45 PM

It was SO hard not to "reply all" with the Snopes link.

Be1dbd31e4a3fccd4394494aa5db256d
17949 · February 29, 2012 at 7:37 PM

Jules is NotAComedian.

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1652 · February 29, 2012 at 7:33 PM

I certify this as not a joke

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2682 · February 29, 2012 at 2:07 PM

I agree with your opinion of consuming cold drinks when you're hot and warm drinks when you are cold. Summers in FL leave me begging for ice-cold water, but my office is kept so cold (year round) I usually have hot tea throughout the day just to stay warm!

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5232 · February 26, 2012 at 11:22 PM

I didn't say it was a cause of all problems but that it may hinder digestion a bit. Paleo is filled with people with crappy a$$ digestion. Maybe staying away from the cold could help them out. And you know, I couldn't imagine a few years back that a little protein could be why I felt crappy all the time. I would have thought it would have made a big impact, but little things matter! i didn't say that TCM is credible because of it's age either. It does give it a little credence in my book but I have a number of practitioner friends who see it work all the time.

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840 · February 26, 2012 at 3:05 AM

LOL (@ what enzymes are required to digest water)

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11557 · February 26, 2012 at 1:51 AM

It's a bit misleading to say "wait for a glass of water to change temperature", because a glass of water is being thoroughly mixed with internal-temp gastric juices in a warm sac inside a warm body.

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11557 · February 26, 2012 at 1:49 AM

I would think that anti-East isn't a "thing" on paleo hacks- people around here are generally "anti believing things just because other people say so even if those things have not been proved".

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2949 · February 24, 2012 at 8:29 PM

Stopped reading at Ayberbede.

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24538 · February 21, 2012 at 4:25 AM

Is there an anti-East ethos? I totally missed that, except maybe questioning whether grains and legumes can ever be "safe". I won't follow TCM blindly, just like I won't follow allopathic medicine, or alternative medicine blindly. I'm here to be really annoying and ask why, why, why, until my curiosity is satisfied. My job is based on TCM, I really dig it, but traditional in and of itself isn't quite enough to qualify something as unquestionably right in my opinion.

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24538 · February 21, 2012 at 4:12 AM

Will do! Tested the warm drink vs. cold drink thing more on myself today, mindful drinking as it were, and I have to say, warm to hot feels a lot less oogy, but then again, I don't normally drink really cold beverages unless I'm about to stick my face in ice water. Not the most super-scientific n=1, but there it is.

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3885 · February 21, 2012 at 4:08 AM

could you elaborate on the 'anti-East ethos' - where do you find it in Paleohacks..

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10255 · February 21, 2012 at 4:00 AM

i take a night school course and my instructor is a ND of norweigian heritage and one of our homework assignments was to switch to cold showers. all but two people in the class reported that the generally feel warmer throughout the day.

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10255 · February 21, 2012 at 3:54 AM

scary....very scary :)

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5232 · February 20, 2012 at 9:32 PM

And to add insult to injury, the body responds to cold by vasoconstricting causing the cooling effect to be even less.

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5232 · February 20, 2012 at 9:32 PM

It eventually will but temperature change isn't instantaneous. Put a glass of ice water at 98.6 degrees. How long does it take to warm?

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10255 · February 20, 2012 at 9:26 PM

this post appears to be about rallying people of a like mind more than anything else.

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5232 · February 20, 2012 at 7:43 PM

HappyNow give me an email @ andrew.day at bastyr dot edu

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24538 · February 20, 2012 at 7:37 PM

I was going to ask about climate in this just because China is so diverse in that sense. Just out of curiosity, do you know what traditional medicine is like in Mongolia, and what their take on beverage temperature is? Personally, I think I'd want a nice warm cup of tea spending time on the Mongolian steppe. In my mind the stereotypical Mongolian diet would be the most like that of our HG ancestors, but I haven't been there to see for myself, so this is pure speculation.

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5232 · February 20, 2012 at 7:21 PM

I wouldn't expect the outcome of drinking cold water to be certain death just impaired health and vitality (stagnation of chi flow and production).

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5232 · February 20, 2012 at 7:20 PM

Happy now - Great response. In the mountain regions of china they still heated there water because of the digestive benefits. They were entirely terrified of putting cold in their bodies. That includes going out on cold nights or dressing inappropriately for the whether. TCM is very climate based. They think that each individual climate has a drastic impact on people and makes the population who live in that climate susceptible to different sorts of diseases. The parasite idea has crossed my mind but that they're only sticklers about having it body temperature doesn't makes sense of that, IMO.

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24538 · February 20, 2012 at 7:11 PM

I'm on the fence about this particular idea. I can see a number of ways it could go, and why traditional medicine would encourage the drinking of water that had been boiled and steeped with medicinal herbs, especially when drinking from wells in crowded cities and villages. Cholera certainly isn't worth the glass of cold water, and over time it was probably observed that folks who drank hot beverages didn't keel over from water borne illnesses as often. In times of food scarcity, especially agrarian food scarcity, you would want to hold on to every calorie possible, and if warm drinks are less taxing on the body and use less energy to digest that would be a good thing.

Going further back historically, drinking water sources in colder climates probably would have been just above freezing, and if that drastically impaired digestion I don't think there would be as many of us around today. Perhaps we have compromised our digestive enzymes so much with a modern diet that cold water can have this serious of an impact on our digestive abilities.

Third thought, modern day lab setting, maybe cold water is the new Olestra. Perhaps part of the noticed short term "benefit" is from impairing enzymatic activity, and not being able to digest food as well and losing weight from that combined with the thermodynamic effect.

D10ca8d11301c2f4993ac2279ce4b930
5232 · February 20, 2012 at 7:21 PM

I wouldn't expect the outcome of drinking cold water to be certain death just impaired health and vitality (stagnation of chi flow and production).

6120c989fd5b69f42a0834b69b87955b
24538 · February 20, 2012 at 7:37 PM

I was going to ask about climate in this just because China is so diverse in that sense. Just out of curiosity, do you know what traditional medicine is like in Mongolia, and what their take on beverage temperature is? Personally, I think I'd want a nice warm cup of tea spending time on the Mongolian steppe. In my mind the stereotypical Mongolian diet would be the most like that of our HG ancestors, but I haven't been there to see for myself, so this is pure speculation.

D10ca8d11301c2f4993ac2279ce4b930
5232 · February 20, 2012 at 7:20 PM

Happy now - Great response. In the mountain regions of china they still heated there water because of the digestive benefits. They were entirely terrified of putting cold in their bodies. That includes going out on cold nights or dressing inappropriately for the whether. TCM is very climate based. They think that each individual climate has a drastic impact on people and makes the population who live in that climate susceptible to different sorts of diseases. The parasite idea has crossed my mind but that they're only sticklers about having it body temperature doesn't makes sense of that, IMO.

6120c989fd5b69f42a0834b69b87955b
24538 · February 21, 2012 at 4:12 AM

Will do! Tested the warm drink vs. cold drink thing more on myself today, mindful drinking as it were, and I have to say, warm to hot feels a lot less oogy, but then again, I don't normally drink really cold beverages unless I'm about to stick my face in ice water. Not the most super-scientific n=1, but there it is.

D10ca8d11301c2f4993ac2279ce4b930
5232 · February 20, 2012 at 7:43 PM

HappyNow give me an email @ andrew.day at bastyr dot edu

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605 · February 21, 2012 at 12:37 AM

What a timely post for me!

I've never liked drinking cold water (or showering in it for that matter) but just this week I've been giving cold water a try, as I thought it was more logically 'paleo' ! The idea being that when hunters and gatherers were out for the day, and come upon a stream or whatever, they'd just drink the water without bothering to stop and make tea. And honestly I'm not disliking it as much as I thought I would. I've put this down to my paleo diet, as since going paleo I have noticed other temperature (or circulation) related improvements. I used to always have ice cold feet and hands for example but no more.

Whether drinking cold or warm water is 'optimal' for health or not would surely be very difficult to determine conclusively. And perhaps what is best for one person on any particular day might change the next day.

My limited understanding of Ayurveda for example, would lead me to think that I may currently be adjusting from being Vata (always cold, needing warmth) to Pitta (easily heated, prefers cool). It's summer here in Australia and I'll be interested to observe if I adjust back to Vata in the winter.

So my personal opinion, based on no real science at all, would be that the body runs optimally when the temperature of the food or drink consumed is assisting (if required) to keep the inner temperature of the body at its optimal level. So cold drinks and food if you are feeling hot, and warm drink and food if you are cold.

And I think the pleasurable invigoration from a glass of cold water (similar to the invigoration you feel with a cold shower) is more positive for the body than negative.

B4e1fa6a8cf43d2b69d97a99dfca262c
10255 · February 21, 2012 at 4:00 AM

i take a night school course and my instructor is a ND of norweigian heritage and one of our homework assignments was to switch to cold showers. all but two people in the class reported that the generally feel warmer throughout the day.

61b801de5dc345b557cd4623d4a4f26b
2682 · February 29, 2012 at 2:07 PM

I agree with your opinion of consuming cold drinks when you're hot and warm drinks when you are cold. Summers in FL leave me begging for ice-cold water, but my office is kept so cold (year round) I usually have hot tea throughout the day just to stay warm!

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13635 · February 20, 2012 at 7:48 PM

I must be missing something. Consuming warm or cold food or beverages may give a certain feeling when they go down the hatch, but everything equalizes to body temperature. I can't imagine food, or especially liquids, maintaining their temperature for very long after hitting the stomach, so I guess that's the side of the fence that I'm on.

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5232 · February 20, 2012 at 9:32 PM

And to add insult to injury, the body responds to cold by vasoconstricting causing the cooling effect to be even less.

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5232 · February 20, 2012 at 9:32 PM

It eventually will but temperature change isn't instantaneous. Put a glass of ice water at 98.6 degrees. How long does it take to warm?

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10255 · February 20, 2012 at 9:26 PM

this post appears to be about rallying people of a like mind more than anything else.

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11557 · February 26, 2012 at 1:51 AM

It's a bit misleading to say "wait for a glass of water to change temperature", because a glass of water is being thoroughly mixed with internal-temp gastric juices in a warm sac inside a warm body.

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2890 · February 20, 2012 at 11:31 PM

I had a cup of cold water once.

Nearly died.

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10255 · February 21, 2012 at 3:54 AM

scary....very scary :)

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8255 · February 29, 2012 at 11:10 PM

You know, I used to drink cold water like you, but then I took an arrow in the knee...

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9812 · February 29, 2012 at 7:09 PM

I don't know how it affects digestion, but drinking cold water with food will give you cancer. I got this helpful email from a coworker last year; he was kind enough to forward it to the entire company-

"Cold Water = CANCER

Drinking cold water after meal = Cancer! (this is not a joke)

For those who like to drink cold water, this article is applicable to you. It is nice to have a cup of cold drink after a meal. However, the cold water will solidify the oily stuff that you have just consumed. It will slow down the digestion.

Once this "sludge" reacted with the acid, it will break down and be absorbed by the intestine faster than the solid food. It will line the intestine.

Very soon, this will turn into fats and lead to cancer. It is best to drink hot soup or warm water after a meal."

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17949 · February 29, 2012 at 7:37 PM

Jules is NotAComedian.

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1652 · February 29, 2012 at 7:33 PM

I certify this as not a joke

24fcc21452ebe39c032be6801d6bbadd
9812 · February 29, 2012 at 7:45 PM

It was SO hard not to "reply all" with the Snopes link.

6714718e2245e5190017d643a7614157
10044 · March 01, 2012 at 6:23 AM

I don't know Stabby, Jules can be a riot at times.

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11557 · February 26, 2012 at 1:44 AM

When it is cold outside, I like hot drinks. When it is hot outside, nothing beats a glass of water with ice cubes. I think it can be as simple as that- there is only a small window where the liquid is going to stay at it's original temperature before it gets diluted and cooled/heated to your internal temperature. Unless you are shooting back a liter of ice water at a time, I really can't conceive that this could have a large effect on the gut, particularly in regards to the vasoconstriction that you mentioned.

Just because Americans drink their liquids colder on average (though ice water is very very accessible in many other countries) doesn't mean this is the cause of all of the problems. Regularly mountain hiking and filtering my own water from streams tells me that drinking fresh, cold water is a pretty nice experience. 3000 years of Chinese medicine doesn't mean that it's auto-legit- my Chinese grandma fed me all kind of weird herbs that I now know have little to no efficacy.

Hot or cold, we can handle it either way. Whatever floats your boat when the weather outside is frightful or delightful...

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5232 · February 26, 2012 at 11:22 PM

I didn't say it was a cause of all problems but that it may hinder digestion a bit. Paleo is filled with people with crappy a$$ digestion. Maybe staying away from the cold could help them out. And you know, I couldn't imagine a few years back that a little protein could be why I felt crappy all the time. I would have thought it would have made a big impact, but little things matter! i didn't say that TCM is credible because of it's age either. It does give it a little credence in my book but I have a number of practitioner friends who see it work all the time.

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78422 · February 20, 2012 at 11:50 PM

My seventeen year experience with Ayurveda leads me to sit on the warm side of the fence. The ice water thing is so American.( Like pasturized milk.) I just ordered eight more bottles of PQQ, so I 'm a big Quilt fan. But I'll go with David Frawley(Ayurvedic Mavin) on this issue. I also NEVER mix fruits and veggies. Instant stomach ache every time. The East has lots of things to teach us. This anti-East ethos is one of the weaker aspects of Paleohacks. Just saying......

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3885 · February 21, 2012 at 4:08 AM

could you elaborate on the 'anti-East ethos' - where do you find it in Paleohacks..

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24538 · February 21, 2012 at 4:25 AM

Is there an anti-East ethos? I totally missed that, except maybe questioning whether grains and legumes can ever be "safe". I won't follow TCM blindly, just like I won't follow allopathic medicine, or alternative medicine blindly. I'm here to be really annoying and ask why, why, why, until my curiosity is satisfied. My job is based on TCM, I really dig it, but traditional in and of itself isn't quite enough to qualify something as unquestionably right in my opinion.

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2949 · February 24, 2012 at 8:29 PM

Stopped reading at Ayberbede.

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11557 · February 26, 2012 at 1:49 AM

I would think that anti-East isn't a "thing" on paleo hacks- people around here are generally "anti believing things just because other people say so even if those things have not been proved".

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20908 · February 26, 2012 at 1:46 AM

Here are some (unorganized) thoughts, I've had about this over the years.

The Ahrennius (check the spelling) equation gives a rule of thumb about chemical reaction rates. The basic result of that is that every 10 degrees (Celcius) you increase a reaction's temperature, you double the reaction rate. So your body is at 37 degrees, and it's nothing to drink ice water at 0 degrees, so that's nearly 40 degrees, which would be slowing down the reaction rate of digestion by 16 times. So until the water warms up, you will be slowing down any (temperature dependent) reactions with the stomach acid and your food.

You're also diluting the stomach acid, so that will affect digestion rates too

Those two statements above are true statements as they deal with the underlying physics and chemistry of the situation; however, the real question we should be asking is "does it matter?". I don't know. My guess is that the water should be warmed up pretty quickly, so the reaction rates should come up pretty quickly. And we should be able to pump more acid to make up for the dilution. I'd say that most of it is personal experience and for you to try it and see how your body reacts to it.

One more thought, a (food) Calorie is defined as the energy required to heat 1 kg (1 L) of water 1 degree Celcius. So just drinking one liter of ice water would require you to burn 37 calories just to warm it up to body temperature.

Also, see my other post on drinking too much and diluting stomach acid.

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30 · February 26, 2012 at 1:06 AM

I've heard that warm/hot water helps with the digestion process

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260 · February 25, 2012 at 8:43 PM

When I visited southeast China, it was impossible to find a cold drink. Everything was room temp or hot, and our translator told us that cold drinks are unhealthy. N=1, I found no noticeable change in my digestion. However, I was only there for 2.5 weeks. I also hadn't discovered paleo at that time so I was stuffing my face with dumplings and room-temp Pepsi on a daily basis... I'd be willing to try the "no cold drinks" thing again; this is some really interesting stuff.

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10255 · February 20, 2012 at 10:45 PM

what enzymes are required to digest water?

how does the gut produce heat?

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840 · February 26, 2012 at 3:05 AM

LOL (@ what enzymes are required to digest water)

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4111 · February 20, 2012 at 7:11 PM

I do like ice cold water when I'm doing an intense exercise or warm. Warm water doesn't sound appealing though. Vasoconstriction of the GI blood vessels could also slow digestion speed, which would result in harder bolus.

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0 · July 14, 2013 at 12:20 AM

Immune systems do their best work at higher temperatures. Bacteria and viruses gain their greatest advantage at lower temperatures. Foodborne illness peaks in the hottest days of summer. If this is because of the degree (pun) of cold foods consumed I would not be surprised. Shutting down the equilibrium of the digestion pros by thermal means could also shut down the digestive tracts immune system giving an opportunity for bugs to more easily infect. We do now that our immune system's thermoregulation system's last resort is fever. Fever is the scourge of viruses as their ability to replicate inside cells is lost at high temperature which in effect ends its growth so the immune system can clean up the prior damage the viruses did.

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50 · March 05, 2012 at 9:55 PM

Yeah. I drink my water warm. It makes sense NOT to drink anything with my meal, because I have poor digestive enzymes.

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