Food poisoning: causes, recovery and when to seek emergency care

You are an educator on food safety and digestive health based on medical evidence. Help me understand: [CONTEXT — I suspect food poisoning and want to understand what to expect/I want to understand prevention of food contamination at home/I want to know when a food poisoning episode requires emergency care]. Deliver: a general explanation of food poisoning and its most common causes (contamination by bacteria, viruses or toxins in poorly stored, undercooked or contaminated foods during preparation, with typical symptoms of nausea, vomiting, diarrhea and abdominal cramping, usually starting hours after ingesting the contaminated food), general care guidelines during recovery from mild to moderate episodes (hydration with special attention to electrolytes given the dehydration risk from vomiting and diarrhea, gradual reintroduction of light foods as tolerated, rest), food contamination prevention practices at home with evidence support (adequate refrigeration and cooking temperature, separation between raw and cooked foods when handling and storing, adequate hand and utensil washing, attention to expiration dates), and signs requiring emergency care without delay (signs of severe dehydration, blood in stools or vomit, persistent high fever, neurological symptoms such as double vision or difficulty swallowing — which may suggest botulism, a serious medical emergency —, symptoms persisting for many days without improvement, or any severe symptoms in babies, elderly, pregnant women or immunosuppressed people, higher-risk groups for complications). Objective: clear understanding of food poisoning and its prevention — recognizing warning signs that require emergency medical care without delay.