Adding Milk To Coffee Doesn't Impair Zn-chelating Capacity

Gabriel

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charlie

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So coffee removes zinc?
 
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Gabriel

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I'm not sure. In this study they tested one component of roasted coffee, named ApV. This one can chelate zinc. The effect of whole coffee may be different.
 
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charlie

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I think that would be a bummer if it chelates zinc. :(
 
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Gabriel

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Bad news: This in vitro study tested whole coffee and found that coffee significantly reduces the bioavailability of zinc, even more than it reduces iron.

Figure 4 summarizes results obtained on availability changes of the three elements after spiking increasing amounts of instant coffee. As can be seen calcium availability remains constant, while for iron and especially for zinc a significant decrease is observed (32% at basal level to 21% at a 3.3%-spiking level of Zn).
 
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charlie

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:cry:
 
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jyb

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Gabriel said:
Bad news: This in vitro study tested whole coffee and found that coffee significantly reduces the bioavailability of zinc, even more than it reduces iron.

That would be quite problematic.
 
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Gabriel

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There may be differences to what really happens in the body, as this was just an in vitro experiment.
 
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Gabriel

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More food for thought:

According to this study in rats, coffee impaired iron but not Zn or Cp in nonpregnant rats. However, in pregnant rats lower levels of zinc in the placenta were found.

In this correlative study on women, coffee consumption was paradoxically positively correlated with both serum iron and zinc. The positive correlation was stronger for iron than for zinc. High orange juice consumption was associated with lower zinc status. Vitamin C is known to increase iron and decrease zinc absorption.

This study looked at the effect of discontinuing coffee consumption in young toddlers on serum zinc, copper and iron. They found that discontinuing coffee did not really affect any of the metals.
 
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Dan Wich

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Interesting stuff, thanks Gabriel. I assumed that you'd made a mistake in your sentence about coffee + toddlers, but no, "Coffee is one of the first liquids given to infants in Guatemala."

Huh.
 
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