However, we also need to keep and prepare foods safely in the home, and be alert when eating out. Foodborne illness is caused by eating food that contains harmful bacteria, toxins, parasites, viruses, or chemical contaminants. Eating even a small portion of an unsafe food may make you sick. Signs and symptoms may appear within half an hour of eating a contaminated food or may not develop for up to 3 weeks. Most foodborne illness lasts a few hours or days.
Some foodborne illnesses have effects that go on for weeks, months, or even years.
If you think you have become ill from eating a food, consult your health care provider. Follow the steps below to keep your food safe. Be very careful with perishable foods such as eggs, meats, poultry, fish, shellfish, milk products, and fresh fruits and vegetables. New information on food safety is constantly emerging. Recommendations and precautions for people at high risk are updated as scientists learn more about preventing foodborne illness.