Is repeatedly boiled water harmful?

Repeatedly boiled water can easily produce carcinogens, such as sulfite. So don't drink boiled water repeatedly, it's really bad for your health. \x0d\ Four best times to drink water: \x0d\ The first time: I just got up in the morning, which is a state of blood shortage. \x0d\ Second time: 8: 00 a.m. 8:00- 10/0, which can replenish the water lost by sweating during working hours. \x0d\ Third time: Around 3 pm, it's tea time. \x0d\ Fourth time: Before going to bed, the blood concentration will increase when sleeping. If you drink water in moderation before going to bed, it will dilute the backlog and dilate blood vessels, which is good for your health.