High caffeine intake, especially from strong teas like black or green tea, can lead to difficulty falling asleep and disrupted sleep patterns.
Caffeine is a stimulant that can lead to increased anxiety, restlessness, and nervousness in some individuals.
Excessive tea consumption can cause digestive problems such as acid reflux, stomach upset, and diarrhea.
Caffeine can temporarily raise heart rate and blood pressure, which might be problematic for those with certain heart conditions.
Tea contains compounds that can hinder the absorption of non-heme iron (from plant-based foods) in the body. This can be a concern for individuals with iron-deficiency anemia.
The tannins in tea can stain tooth enamel, leading to discoloration over time.
Excessive tea consumption, particularly in those who have a low calcium intake, might be associated with a slightly increased risk of osteoporosis due to the oxalates in tea.
Caffeine withdrawal or sensitivity to caffeine can trigger headaches or migraines in some individuals.
Tea, particularly black tea, contains oxalates, which can contribute to the formation of kidney stones in susceptible individuals.