1. Increase caffeine intake: Oolong tea contains a moderate amount of caffeine, and excessive drinking will lead to insomnia, headache, palpitation and anxiety.

2. Too much sugar: Bottled oolong tea on the market often contains a lot of added sugar. Excessive sugar intake can lead to obesity, hyperglycemia and cardiovascular disease.

3. May contain additives: Some bottled oolong tea may contain artificial pigments and other chemicals, and excessive drinking may cause allergic reactions.

4. Harmful to teeth: Long-term drinking in the mouth may damage teeth.

Therefore, moderate consumption of bottled oolong tea is safe for the general healthy population, but excessive consumption may have some negative effects. It is recommended to drink in moderation, and at the same time pay attention to the content of calories, sugar, additives and other ingredients. It is best to choose sugar-free or low-sugar tea drinks to maintain healthy eating habits.