Iron and calcium absorption

[Guest guest]

http://www.albion.com.br/textos/med2.php3

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" Effect of Calcium Carbonate and Hydroxyapatite on Zinc and Iron

Retention In Postmenopausal Women. "

Dawson-, B. et al., Am J Clin Nutr, 1986; 44:83-88.

STUDY CONCLUSION: The absorption of non-heme iron was greatly reduced by

the addition of calcium supplements to a meal. Zinc absorption did not

seem to be affected by the additional calcium. As evidenced by the

conclusions of these studies, as well as many others, there are many

factors that can cause a less than desirable absorption of inorganic

iron salts. These include:

Phytates ... Divalent Anions

Oxalates Phosphates

Antacids Tetracyclines

Calcium Supplements

Zinc

SO, the advice we've heard here many times, NOT to take calcium with

your iron, and not to take anything other than Vitamin C and a few trace

B vitamins with your iron, seems to be borne out by at least one

respectable study.

Ziobro

Open RNY 09/17/01

http://www.ziobro.us

[Guest guest]

This study is applicable only to calcium in calcium carbonate and

hydroxyapatite forms, but is not applicable to calcium in calcium

citrate or calcium amino acid chelate form. It is also applicable only

to non-heme iron, i.e., iron from other than meat sources. This is also

the reason why ferrous sulfate may not be an effective form of iron

supplementation when taken with a meal. Ferrous sulfate itself is very

absorbable. Too absorbable in fact. It breaks down very easily is just

water. The problem is that it then forms a new compound which can not

be broken down by gastric juices and which is therefor unabsorbable

=

Ray Hooks

For WLS nutrition info, visit

http://www.bariatricsupplementsystem.com

Ziobro wrote:

>

> http://www.albion.com.br/textos/med2.php3

> <http://www.albion.com.br/textos/med2.php3>

>

> " Effect of Calcium Carbonate and Hydroxyapatite on Zinc and Iron

> Retention In Postmenopausal Women. "

> Dawson-, B. et al., Am J Clin Nutr, 1986; 44:83-88.

>

> STUDY CONCLUSION: The absorption of non-heme iron was greatly reduced by

> the addition of calcium supplements to a meal. Zinc absorption did not

> seem to be affected by the additional calcium. As evidenced by the

> conclusions of these studies, as well as many others, there are many

> factors that can cause a less than desirable absorption of inorganic

> iron salts. These include:

>

> Phytates ... Divalent Anions

> Oxalates Phosphates

> Antacids Tetracyclines

> Calcium Supplements

> Zinc

>

> SO, the advice we've heard here many times, NOT to take calcium with

> your iron, and not to take anything other than Vitamin C and a few trace

> B vitamins with your iron, seems to be borne out by at least one

> respectable study.

>

> Ziobro

> Open RNY 09/17/01

> http://www.ziobro.us

>

>