I have heard the last meal I ate is what caused my foodborne illness (food poisoning), is this true?

Except for some toxins and viruses, most harmful microorganisms take longer than a few hours to make you sick. Symptoms of foodborne illness can start anywhere from a few hours to several weeks after eating contaminated food. So don't be so quick to blame your illness on the restaurant you ate at today for lunch - you may have gotten sick from something you ate a few days ago. Contact your local health department if you suspect you have a foodborne illness or want to file a complaint about unsafe food handling practices at a restaurant.

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1. What should I do if I think a meal I ate made me sick?
2. What is the best thing I can do to prevent food-borne illness at home?
3. I have heard the last meal I ate is what caused my foodborne illness (food poisoning), is this true?
4. Should I prepare food for others when I am ill?