Insomnia
A single cup of tea contains between 14 to 60 milligrams of caffeine. While this amount is relatively low compared to that found in coffee, it can still enhance energy levels in the human body, with effects varying from person to person. Excessive tea consumption may lead to insomnia, anxiety, and sleep disturbances.
Withdrawal-like Symptoms
Reducing tea consumption can trigger withdrawal symptoms, particularly in individuals accustomed to high intake. Common symptoms include headaches and severe fatigue. According to Johns Hopkins University School of Medicine, these symptoms bear resemblance to mental health disorders.
Skeletal Fluorosis
Excessive tea drinking can result in fluoride accumulation in the bones, potentially leading to skeletal fluorosis. One of the primary symptoms of this condition is bone pain.
Risks for Pregnant Women and Infants
Consuming more than three cups of tea during pregnancy poses health risks. Increased tea intake during this period has been linked to a higher likelihood of miscarriage, Sudden Infant Death Syndrome (SIDS), and low birth weight in infants, who may also exhibit caffeine withdrawal symptoms.
Increased Estrogen Levels in Women
Tea can mimic estrogen in the body; therefore, women with breast, uterine, or ovarian cancer, as well as those suffering from endometriosis or uterine fibroids, are advised to limit their tea consumption to avoid worsening their conditions.
Osteoporosis
High caffeine intake can lead to increased calcium excretion, contributing to osteoporosis. Older women with a genetic predisposition to vitamin D absorption issues should exercise caution when consuming tea. It is recommended that individuals limit their tea intake to no more than 2-3 cups per day.
Reduced Iron Absorption
Green tea contains antioxidants known as flavonoids, which, although beneficial, can bind with iron found in plant sources such as grains, fruits, and vegetables, thereby decreasing its absorption efficiency in the body. Research from the Linus Pauling Institute indicates that consuming green tea alongside meals rich in plant-based iron can reduce absorption by up to 70%.
Other Health Issues
Excessive green tea consumption can impact individuals with anemia, glaucoma, and cardiovascular issues, as well as those with bleeding disorders. It can also cause digestive issues in individuals suffering from diarrhea.