Nelly Can gave a speech about the dangers of alcohol for one's health. She discussed six main points: 1) Alcohol can damage nerves and the brain, causing addiction and loss of control. 2) It often leads to poverty as money is spent on drinks rather than necessities. 3) It disturbs reproductive functions, lowering libido and possibly causing impotence. 4) It can result in mental disorders like decreased concentration and irritability. 5) Metabolism is disrupted as the liver is damaged, spreading toxins. 6) Heart problems may occur like clogged arteries, tightness, and potential death. Each point was accompanied by a picture to illustrate the health problems caused by alcohol.