If you’ve been diagnosed with iron-deficiency anaemia you should be aware that, like other teas, green tea contains natural compounds called tannins. These compounds interfere with the absorption of iron– for this reason it’s useful to avoid drinking tea with an iron-rich meal and leave at least one hour before having a brew.
Because of green tea’s beneficial effects, a number of ‘health’ products include traces of green tea. However, there is limited evidence to suggest these products are effective. If you are hoping to use green tea for medicinal purposes, refer to your GP to ensure you may do so without risk to your health.
If you are sensitive to caffeine, it is advisable to limit the total number of caffeinated drinks you drink in a day. Too much caffeine may disrupt sleep and, in some people, increase anxiety; if this is relevant to you, look to reduce your intake and aim to have your last caffeinated drink at about 12 noon.