Coffee and zinc absorption

Vinero

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I know Ray recommends having coffee after eating red meat to limit iron absorption.
But since red meat is my main source of zinc ( i don't eat oysters) will coffee also inhibit zinc absorption? Does anyone know if coffee inhibits absorption of other minerals besides iron?

I don't eat a lot of red meat lately since I noticed a while ago when I was eating beef everyday that I got some liver spots/lipofuscin on my face! They have gone partially away when upping my Vitamin E intake. Now I just eat red meat twice a week usually.
 

Filip1993

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I have thought about this too. I drink a lot of coffee so I'm a bit worried that it might interfere with nutrient absorption in some way. This doesn't answer your question though...
 

charlie

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:bump2
 

Giraffe

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Effect of caffeine on zinc absorption and Zn concentration in rat tissue.
http://www.ncbi.nlm.nih.gov/pubmed/2223751

The results consistently showed that the caffeine solution infused into the intestine did not affect intestinal Zn absorption nor was absorption affected by the direct injection of caffeine into the vein. In contrast, injection of different doses of the caffeine solution significantly decreased Zn tissue levels for the heart only. Calcium concentrations in the heart tissue were also decreased, but not magnesium concentrations. Tissue Zn levels recovered immediately on infusion of a Zn solution into the intestine.

Regarding bioavailabilty of vitamins and minerals I often check Australian RDI first...
https://www.nrv.gov.au/nutrients/zinc
 

charlie

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Giraffe, :hattip
 

jyb

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Giraffe said:
https://raypeatforum.com/forums/posts/96890/ Effect of caffeine on zinc absorption and Zn concentration in rat tissue.
http://www.ncbi.nlm.nih.gov/pubmed/2223751

I read the opposite on online textbooks, though I don't find a study specifically for coffee. Not sure if I would trust that study because it doesn't simulate a meal - infusion into intestines directly (what about the stomach?). There does seem to be studies for tea limiting minerals like zinc, though. There's probably a human study for coffee and zinc I'm sure, just need to dig deeper.
 
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tara

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jyb said:
https://raypeatforum.com/forums/posts/96903/
Giraffe said:
https://raypeatforum.com/forums/posts/96890/ Effect of caffeine on zinc absorption and Zn concentration in rat tissue.
http://www.ncbi.nlm.nih.gov/pubmed/2223751

I read the opposite on online textbooks, though I don't find a study specifically for coffee. Not sure if I would trust that study because it doesn't simulate a meal - infusion into intestines directly (what about the stomach?). There does seem to be studies for tea limiting minerals like zinc, though. There's probably a human study for coffee and zinc I'm sure, just need to dig deeper.

Giraffe's study is on caffeine. I thought it might have been other constituents of coffee that were reputed to lower iron absorption?
 
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Giraffe

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This is from a book about coffee (google book preview)... I closed the tab and can't find it again.

High coffee consumption could reduce absorption of zinc through intraintestinal formal of complexes with phytates contained in coffee.

Studies on the Bioavailobility of Zinc in Man.
Effects of the Guatemalan Rural Diet and of the Iron-Fortifying Agent, NaFeEDTA

http://jn.nutrition.org/content/109/9/1519.full.pdf

Probably, phytates, dietary fiber and calcium are major factors, and coffee is a minor factor in this inhibition.

Next question: What about calcium?

Handbook of Human Toxicology edited by Edward J. Massaro (google book preview)

Contrary to animal studies, human studies indicate that dietary calcium has a relatively minor negative effect on zinc status. One study found that adding 500 mg of calcium to the diet did not decrease zinc absorption in humans. Another study found that increasing calcium intake to 2000 mg per day had a slight, although not significant, negative effect on zinc absorption and balance.

Unfortunately the pages with the references were not displayed in the google previews.

Maybe someone digs up a study that makes it a bit clearer.
 

mujuro

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tara said:
jyb said:
https://raypeatforum.com/forums/posts/96903/
Giraffe said:
https://raypeatforum.com/forums/posts/96890/ Effect of caffeine on zinc absorption and Zn concentration in rat tissue.
http://www.ncbi.nlm.nih.gov/pubmed/2223751

I read the opposite on online textbooks, though I don't find a study specifically for coffee. Not sure if I would trust that study because it doesn't simulate a meal - infusion into intestines directly (what about the stomach?). There does seem to be studies for tea limiting minerals like zinc, though. There's probably a human study for coffee and zinc I'm sure, just need to dig deeper.

Giraffe's study is on caffeine. I thought it might have been other constituents of coffee that were reputed to lower iron absorption?

The lead skeptic on Peatarian posted a number of studies showing that almost nothing impacts absorption of heme-iron, that which is found in red meat.
 
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Giraffe

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Wondered about the amount of heme-iron in meat...

Total iron and heme iron content and their distribution in beef meat and viscera.
http://www.ncbi.nlm.nih.gov/pubmed/19475341

HeFe was 64% of TFe in meat and 72.8% in spleen, 53.8% in lung, 35.7% in brain, 35.0% in kidney, 27.3% in heart, and only 13.6% in liver.
___________

I started a new thread about calcium's effect on iron absorption (including heme-iron). viewtopic.php?style=22&f=2&t=7617
 

LucH

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Filip1993 said:
https://raypeatforum.com/forums/posts/59807/ I have thought about this too. I drink a lot of coffee so I'm a bit worried that it might interfere with nutrient absorption in some way. This doesn't answer your question though...
excessive amount of caffeine (more than 3 - 4 mugs) cant interfere with B2. You nee B2 for methylation, a vital process.
Exerpt:
vitamins B1, vitamin B2 deficiency occurs in persons who consume large amounts of tea, coffee and alcohol.

As I suppose many people haven't heard of methylation defect, here is an introduction:
“Methylation is a vital metabolic process that happens in every cell and every organ of our body. Life would simply not exist without it. It takes place more than a billion times per second in the body.”
Chris Kresser MD

“Our bodies contain enzyme machinery to perform a vast array of chemical reactions necessary for life. Scientists often organize these chemical reactions into metabolic pathways that involve a series of reactions that occur together in a sequence. We have metabolic pathways to burn sugar for energy, to detoxify harmful chemicals that we ingest, to make DNA for cell reproduction, to make important brain chemicals like serotonin and dopamine and many others. Many of these metabolic pathways require a methylation reaction. Stated simply, a methylation reaction takes a portion of a chemical molecule called a methyl group and moves it from a donor to a recipient. The recipient molecule has to have the methyl group as part of its structure to function normally.
There are over 200 different chemical reactions in our metabolic pathways where methylation has to occur. Methylation is occurring trillions of times a day throughout all of our cells and tissues. When our bodies do not methylate with ease, we suffer from immune system problems, hormone balance problems, digestive problems, energy problems, brain problems including moods and memory just to name a few. Abnormal methylation blocks normal function of almost all our cells and tissues!”
Wally Taylor MD

Within our bodies, there are countless compounds which require methylation in order to be built, stopped or eliminated
Furter details on the subject if you want more ;)
:hattip
LucH
 

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