When a friend visits every month, menstrual blood will carry away some iron. Therefore, it is advisable for women to consume iron-rich foods during this time, such as spinach, apples, and grapes. However, tea contains tannic acid at levels as high as 30% to 50%, which can hinder the intestinal mucosa's absorption and utilization of iron. In the intestines, it easily forms precipitates with iron from food or from iron supplements in chyme.
Pregnancy
Pregnant women should avoid drinking tea because strong tea contains caffeine concentrations as high as 10%, which can increase urination and heart rate, adding to the burden on the mother's heart and kidneys. This can induce conditions like pregnancy toxemia, which is detrimental to the health of both the mother and the fetus. Labor Period
Drinking too much strong tea before labor can cause insomnia due to the stimulating effects of caffeine. If sleep is insufficient before childbirth, it can often lead to exhaustion during delivery, weak contractions, and even dystocia. Breastfeeding
After giving birth, if you plan to breastfeed, it is not advisable to drink large amounts of tea. This is because during this period, the high concentration of tannic acid in the tea can be absorbed by the mucous membranes into the bloodstream, causing astringent and inhibitory effects on mammary gland secretion, leading to insufficient milk production. On the other hand, the caffeine in the tea can also pass into the baby's body through breast milk, affecting the infant's health. Menopause
As women typically enter menopause around the age of 45, they may experience symptoms such as dizziness, fatigue, sometimes a rapid heartbeat, emotional impulsiveness, insomnia, and menstrual dysfunction. Excessive tea consumption can exacerbate these symptoms, making it more difficult to navigate menopause smoothly.