1. Accelerate metabolism: Lemon and black tea are rich in antioxidants and vitamin C, which can promote metabolism and help the body detoxify.

2. Improve digestion: Both lemon and black tea contribute to digestion, and rock sugar helps to relieve stomach discomfort such as gastric acid and gastric acid reflux.

3. Replenish energy: Rock sugar is rich in glucose and is the energy source needed by the body. Lemons and black tea also contain caffeine, which can increase physical strength and mental state.

4. Lowering cholesterol: Lemon black tea helps to lower the levels of total cholesterol and low-density lipoprotein cholesterol, thus reducing the burden on the cardiovascular system.

5. Improve immunity: Lemon and black tea are rich in antioxidants and vitamin C, which can enhance immunity and prevent diseases such as colds.