overnight tea means 12 hours. Overnight tea generally refers to tea that has been soaked for more than 12 hours or left overnight, and is called overnight tea. Overnight tea doesn't just mean a night apart, but is defined according to the soaking time, which generally refers to tea that has been placed for a long time. The main effective component in tea is tea polyphenols, which has antibacterial effect, so the microorganisms in overnight tea will be inhibited by tea polyphenols.

Precautions for drinking tea:

1. Avoid drinking tea for a long time. Any kind of tea should not be soaked in water for too long. Because the concentration of tea soup after long soaking is too high, or some substances that are not easily soluble in water will also leach out, which will have a bad influence on the body.

2. Avoid drinking overnight tea. Most of the tea brewed after a long time has bred and multiplied a lot of bacteria. To be exact, it is not recommended to drink tea that has been left for a while.

3. Avoid drinking strong tea. Strong tea contains a lot of irritating theophylline, which will make you uncomfortable.