16/07/2021
Factors affecting absorption of dietary iron
Foods containing phytates, calcium and polyphenols can significantly reduce iron absorption.
➡Calcium-Rich Foods
➼Excess calcium taken as supplements can all depress non heam iron absorption.
➼165 mg of calcium from milk, cheese or a supplement reduced iron absorption by around 50–60%.
➼In the case of supplements, calcium and iron supplements should be taken at different times of the day, if possible.
➼To maximize absorption, calcium-rich foods should not be eaten with meals that provide most of your dietary iron.
➡ Foods Containing Polyphenols
➼Polyphenols are found in various amounts in plant foods and beverages, including vegetables, fruits, some cereals and legumes, tea, coffee and wine.
➼Coffee and tea, both of which are widely consumed around meals, have a high content of polyphenols, and they have been shown to inhibit the absorption of non-heme iron.
➼Drinking a cup of black tea with a meal reduced iron absorption by 60–70%.
➡ Foods Containing Phytate
➼Phytate, or phytic acid, is found in foods like whole grains, cereals, soy, nuts and legumes.
➼Even a small amount of phytate can significantly decrease iron absorption .
➼ 2 mg of phytate in foods inhibited iron absorption by 18% .
➼Negative effect of phytate can be counteracted by consuming foods that enhance non-heme iron absorption, such as vitamin C or meat.
Regards:-
Dr Ammara Iqbal Dietitian and Nutritionist