Because Tieguanyin contains more polyphenols, aldehydes and alcohols, these substances have little effect on healthy people, but for patients with poor gastrointestinal function, especially those with chronic gastrointestinal inflammation, these substances will stimulate gastrointestinal mucosa, and people with poor gastrointestinal function are more likely to induce stomach diseases, so it is not advisable to drink more.

In addition, Tieguanyin also contains more caffeine, active alkaloids and a variety of aromatic substances, which will also excite people's central nervous system. Patients with neurasthenia and cardiovascular and cerebrovascular diseases should drink it in moderation, not before going to bed or on an empty stomach.

Extended data:

Classification of Tieguanyin varieties:

1. Fragrant Tieguanyin: Fragrant Tieguanyin has a light taste and a slightly sweet tongue tip, and tends to be made by modern technology. At present, the market share is the largest. The fragrant Tieguanyin is green in color, clear in soup color, rich in aroma, obvious in floral fragrance and mellow in taste.

2. Luzhou-flavor Tieguanyin: Luzhou-flavor Tieguanyin has a mellow taste, a long aroma and a sweet taste. It is a product made of tea baked by traditional technology. Luzhou-flavor Tieguanyin has the characteristics of "fragrance, concentration, alcohol and sweetness".

3. Tieguanyin in Sean: Tieguanyin in Sean, also known as old tea or cooked tea, is a semi-fermented tea made from Tieguanyin with strong aroma or faint fragrance, which has been stored for a long time and reprocessed repeatedly. Sean Tieguanyin has the characteristics of "thick, mellow, moist and soft".

? Baidu Encyclopedia-Tieguanyin