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the effect of different types of tea on iron absorption
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More people drink tea than any other beverage except water. Tea, especially green tea, may lower your risk for many health conditions. However, tea can also decrease the amount of iron you absorb, which can be important if you already don't consume enough iron.
The iron that our body absorbs to our hemoglobin is Fe+2.
Drinking tea can decrease the absorption of iron from plant-based sources. Compounds in tea bind to iron, decreasing its absorption to more than 50 percent.
the effect of different types of tea on iron absorption
how can we solve this problem?
hypothesis
Tea does have an inhibiting effect on iron absorption but what we’re really trying to answer is “Which tea has the most effect on inhibiting iron absorption: Red tea, Green tea, or White tea? And which one of them has the least effect on it?”
Red tea, green tea, and white tea naturally contain compounds called tannins. Tannins give tea their color and characteristic taste. However, our hypothesis about that was that red tea has the highest effect on iron absorption in our body since it has the darkest color.
Material
1. extracted iron from green beans
2. red tea
3. green tea
4. white tea
5. lemon juice
6. boiling water
7. dropper
8. beaker
9. 6 test tubes
what's up with tea and iron?
step 1
prepare the 3 different types of tea and the extracted iron into the beakers.
Procedure
step 3
As we can see, red tea has the darkest black color, green is a little bit lighter and white has the lightest black color.
record your observation
step 2
pour some of the extracted iron (from the green beans boiled for 1 hour) into the test tubes, then put some drops of each and watch.
step 4
prepare another 3 test tubes with tea added to the extracted iron, then add on each one a few drops of lemon juice.
results
conclusion
Red tea has the most inhibiting effect on iron absorption because when we drink it, a compound called xanthan (a water-soluble natural gum produced by the fermentation of sugar) clogs the pores in the human’s intestines and tends to prevent efficient iron absorption.
continued
We added lemon; which is rich in vitamin C, because it may partially counteract this effect.
So its not good to drink tea after a meal that contains iron, unless after 2 hours.
And as the results showed, white tea has the least inhibiting effect on iron absorption because it has the least amount of xanthan clogs and tannis.
amount of tannins
highest
medium
lowest
effect on
iron absorption
highest
medium
lowest
type of tea