Dr. Andrei Tiagilnikov, a chief independent specialist in primary healthcare at the Health Management in Moscow, advises against excessive consumption of concentrated black tea. He points out that "this particularly includes people suffering from high blood pressure and pregnant women." According to him, black tea has a noticeable stimulating effect, antimicrobial properties, beneficial effects on the nervous system, improves mood, and enhances metabolism.
Green tea, being less processed, retains more vitamins, minerals, antioxidants, and other elements. It can lower blood pressure, improve immunity, decrease blood glucose levels, and enhance concentration and attention. He states: "However, neither tea nor other beverages can replace water. Because, in addition to its mentioned benefits, tea has properties that help expel fluids from the body. For example, hot tea increases the sweating process. Tea also has diuretic properties and contributes to the removal of calcium from the body. Therefore, to compensate for the fluid loss in blood, lymph, and cells, one should drink pure water without chemical impurities."
The doctor also emphasizes that "green tea cannot be a substitute for food, even though it is often included in various diets for weight loss. Tea nourishes and energizes the body as it is a source of vitamins, minerals, enzymes, and amino acids, which allows for a longer feeling of fullness, helps normalize metabolic processes, and reduces swelling."
