While black tea is often celebrated for its rich flavour and potential health benefits, it can also have negative effects if consumed excessively. One of the primary concerns is its caffeine content, which can lead to increased heart rate, insomnia, and anxiety in sensitive individuals. Additionally, overconsumption of black tea may contribute to digestive issues, such as acid reflux or stomach discomfort, particularly in those with pre-existing conditions.

Furthermore, black tea contains tannins that can hinder the absorption of certain nutrients, notably iron, potentially leading to deficiencies over time, especially in those with already low iron levels. Another aspect to consider is the possibility of dental stains and enamel erosion from prolonged exposure to the acids and pigments found in the tea. As with many things, moderation is key; enjoying black tea in reasonable amounts can help mitigate these adverse effects while allowing one to savour its robust taste.