The document discusses several negative effects of underage drinking including:
1) Brain damage can occur from drinking alcohol at a young age due to shrinking of the brain over time which can lead to memory loss later in life.
2) Teenage drinking can result in alcohol-related accidents that kill over 8 teenagers every day and account for around 2,000 deaths of people under 21 annually.
3) Underage drinking is associated with risks like unprotected sex, substance abuse, violence, and depression which sometimes leads to suicide.