What is food poisoning, and what causes it?
Food poisoning results from consuming food or beverages contaminated with bacteria, viruses, parasites, or their toxins. In France, outbreaks of foodborne illness account for more than 1,500 reported cases per year.
Arnaud, a Doctor of Pharmacy, recommends rehydration with oral rehydration solutions as the first line of treatment before any other intervention.
- Salmonella: undercooked poultry and eggs, mayonnaise — fever, diarrhea, vomiting 12–36 hours after ingestion — duration 4–7 days
- Staphylococcus aureus: preformed toxin in deli meats, cream-filled pastries, and improperly refrigerated prepared foods—very rapid onset (1–6 hours), predominantly severe vomiting
- Listeria monocytogenes: raw-milk cheeses, deli meats, smoked products — long incubation period (up to 70 days) — severe in pregnant women (fetal listeriosis), immunocompromised individuals, and the elderly
- Norovirus: the leading cause of winter gastroenteritis—highly contagious—raw oysters, buffet foods—rapid person-to-person transmission
- Enterohaemorrhagic E. coli (STEC): undercooked ground beef, sprouts — bloody diarrhea — serious complication: hemolytic uremic syndrome (HUS) in children → pediatric emergency
Management and Treatment of Food Poisoning
- Rehydration is the top priority: oral rehydration solution (ORS)—replenishes fluid and electrolyte losses—for children, use pediatric ORS (Hydralin, Picolite) rather than plain water or soda — see our stomach and digestive health product line
- Digestive rest: small, light meals (rice, banana, toast, fruit compote) in the first 24–48 hours — gradually resume a normal diet
- Useanti-diarrheal medications with caution: loperamide (Imodium)—contraindicated if there is a high fever or blood in the stool (risk of toxin retention)—never give to children under 2 years of age—see our page on diarrhea
- Smectite (Smecta): intestinal adsorbent — binds toxins and pathogens — no risk of retention — safe for use in children and pregnant women
- Antiemetics: only on medical advice — do not suppress vomiting, as it helps eliminate toxins in the first few hours
When should you seek emergency care?
Most cases of food poisoning resolve on their own within 24–72 hours. Certain symptoms require urgent medical attention or a call to 15.
- Signs of severe dehydration: intense thirst, dry mouth, no urine for more than 8 hours, sunken eyes, sunken fontanelle in infants—pediatric emergency
- Blood in the stool or vomit: suggest STEC (HUS) or dysentery—do not take loperamide—seek immediate medical attention
- Fever > 38.5°C persisting for more than 48 hours, severe chills, deterioration in general condition → possible sepsis caused by Salmonella or Listeria
- At-risk individuals: pregnant women (listeriosis), children < 2 ans, personne >, people aged 75 and older, immunocompromised individuals—seek medical attention at the first sign of symptoms; do not wait 48 hours
- Call 15 if: loss of consciousness, seizures, difficulty breathing, stiff neck (Listeria meningitis)
Prevent food poisoning: the 4Cs rule
- Clean: Wash your hands for 30 seconds with soap before and after handling food—disinfect cutting boards, utensils, and kitchen surfaces
- Separate (Cross-contamination): Never cut raw meat and vegetables on the same cutting board — refrigerate raw and cooked foods separately — use different utensils
- Cook: Cook poultry to an internal temperature of 74°C and ground beef to 71°C—use a food thermometer—never reheat a dish more than once
- Chill: Refrigerate leftovers within 2 hours (1 hour in summer or if the temperature is above 30°C) — keep the refrigerator at 4°C or below — never refreeze a thawed product
- Mandatory reporting of foodborne illness outbreaks: any suspected outbreak of foodborne illness must be reported to the ARS (Regional Health Agency) for epidemiological investigation
