Food Poisoning: What Is Happening in Your Body and How to Get Through It Safely

What causes food poisoning and how does it work?

Food poisoning occurs when you eat or drink something contaminated with bacteria, their toxins, viruses or parasites. The digestive system responds by trying to expel the threat as quickly as possible through vomiting and diarrhoea. This is a protective response, but the fluid losses it causes are what make the condition dangerous.

The most common bacterial causes include Salmonella, found mainly in poultry and eggs; Escherichia coli, found in raw meat and some produce; Campylobacter, the most common bacterial cause in many parts of the world; and Listeria, which lives in soft cheeses, deli meats and unpasteurised dairy. Staphylococcus aureus is different in that it produces heat-stable toxins in food before you eat it, meaning that reheating contaminated food does not make it safe.

The WHO estimates that 600 million people suffer foodborne illness each year and 420,000 die, most of them children under five in low-income settings. A 2017 review of foodborne disease in the Gulf states noted that rapid population growth, high tourism, large outdoor catering events and extreme heat create specific challenges for food safety in the region.

Why heat and large gatherings multiply the risk in this region

Bacteria multiply fastest in the temperature zone between 4 and 60 degrees Celsius, which food scientists call the danger zone. In summer temperatures that routinely exceed 40 degrees Celsius in many parts of the Middle East, food left on a table or countertop for two hours can become genuinely dangerous. The same dish that would be safe for four hours in a European kitchen may harbour harmful levels of bacteria after ninety minutes in a Gulf summer.

Weddings and large social gatherings are a well-documented setting for mass food poisoning events. The reasons are consistent: large quantities of food that are difficult to keep refrigerated uniformly, long gaps between preparation and serving, and high-turnover catering kitchens where temperature control is inconsistent. A 2024 outbreak study published in BMC Infectious Diseases describing a salmonellosis outbreak at a wedding reception identified food held at unsafe temperatures for extended periods as the key factor, a pattern seen in multiple outbreak investigations across the region.

Power cuts are a practical food safety hazard in Syria, Iraq, Lebanon and Yemen where prolonged outages in summer heat allow refrigerators to warm rapidly. Meat, poultry and dairy that have been unrefrigerated for four or more hours during summer should be treated with caution even if they smell and look normal, because many dangerous bacteria produce no change in taste, smell or appearance.

What are the symptoms and how do you know it is food poisoning?

The typical presentation of food poisoning involves nausea, vomiting, diarrhoea, abdominal cramping and sometimes a low fever. What distinguishes food poisoning from a general stomach virus is often the timing: symptoms appear within hours of a particular meal, and several people who ate the same food develop similar symptoms around the same time. If you ate at a shared meal and two or more people are sick in the same household or group, the probability of a shared food source is high.

Watery diarrhoea usually means the organism is acting in the small intestine, drawing fluid out through toxin action. Bloody diarrhoea is a more serious sign that points to bacterial invasion of the large intestine wall, causing inflammatory colitis. This type warrants medical assessment rather than home management. It is important not to confuse the appearance of a small amount of blood from anal irritation with true bloody stool, which is typically dark red and mixed throughout the stool.

Sometimes the illness is almost entirely vomiting with little or no diarrhoea. This pattern is characteristic of Staph aureus toxin poisoning or Bacillus cereus toxin, both of which act directly on the stomach. These episodes are usually short-lived but extremely unpleasant and carry a dehydration risk if the person cannot keep any fluid down.

How to treat food poisoning at home

The primary goal of home treatment is preventing dehydration. The WHO and the US CDC both identify oral rehydration solution (ORS) as the cornerstone of management because it replaces not only water but the sodium, potassium and glucose that the gut loses during diarrhoea and vomiting. Commercially prepared ORS sachets are widely available in pharmacies across the region and are inexpensive. A 2025 review in Pediatrics in Review confirmed that ORS is equally effective as intravenous fluids in mild to moderate dehydration in children who can drink, which means most children do not need a hospital drip if ORS is given correctly from the start.

Rest allows the gut to recover without additional demands. Food should be reintroduced gradually starting with bland, easily digested choices: plain rice, banana, plain bread or toast, and plain yoghurt which reintroduces helpful bacteria. Fatty, fried and spicy foods should wait until the gut has returned to normal. Most adults with food poisoning can return to a light normal diet within two to three days.

Anti-diarrhoeal medications such as loperamide reduce the frequency of loose stools but do not treat the cause and should not be used in children under twelve, or when there is bloody diarrhoea or high fever, because slowing gut transit can trap bacteria inside the intestine and potentially worsen the situation. For most adults with watery diarrhoea without these red flags, a single dose can provide short-term relief during, for example, a journey, but ORS remains the more important intervention.

Does food poisoning need antibiotics?

In the great majority of cases it does not. A healthy immune system clears most food-poisoning organisms within a few days without any antibiotic. Self-medicating with antibiotics without medical advice is counterproductive for two reasons: it disrupts the protective gut microbiome that helps clear infection, and in some infections, particularly Salmonella, inappropriate antibiotics can paradoxically prolong the duration of illness and increase the risk of the bacteria invading the bloodstream.

Antibiotics are appropriate when a doctor identifies a specific indication: severe or prolonged bloody diarrhoea pointing to Shigella or Campylobacter, infection in an immunocompromised patient, suspected Listeria in a pregnant woman, or a patient sick enough to require hospital admission. In these situations the organism should ideally be identified by stool culture so the antibiotic chosen matches its sensitivity pattern.

The same pattern of casual antibiotic use without a prescription that drives antibiotic resistance in urinary infections applies in food poisoning. Resistance in Salmonella, Campylobacter and Shigella has risen substantially across the region and limits the treatment options a doctor has when antibiotics genuinely are needed. Reserving antibiotics for the cases that truly require them is a shared responsibility.

How to keep your family safe from food poisoning

Food safety rests on four consistent rules: clean, separate, cook and chill. Thorough handwashing with soap before handling food, after handling raw meat, and after using the bathroom removes most of the bacteria that cause food poisoning. Kitchen surfaces, chopping boards and utensils should be cleaned after every contact with raw poultry or meat, not just rinsed.

Cross-contamination between raw and cooked food is a common source of illness. Raw chicken should be stored on the lowest shelf of the refrigerator in a sealed container to prevent drip contamination. Separate chopping boards for raw meat and ready-to-eat food eliminate a common transfer route. Poultry and minced meat should be cooked until the juices run clear and the centre is no longer pink, and a food thermometer confirms this more reliably than visual inspection.

Refrigeration slows bacterial growth but does not stop it, and it does not reverse growth that has already occurred. Cooked food should not be left at room temperature for more than two hours in summer. Leftovers should be stored in sealed containers and reheated thoroughly until steaming throughout before eating. In settings with frequent power cuts, a bag of ice in the refrigerator and keeping the door closed as much as possible buys additional time.

Food poisoning at weddings and large gatherings

When several guests at the same event become ill with similar symptoms within a similar time frame, this is a foodborne outbreak and it should be reported to the local health authority. Reporting is not about blame: it allows the source to be identified and prevents more people from becoming sick if the contaminated food is still being served or sold. Most countries in the region have a health directorate number or ministry helpline for this purpose.

At large events, practical risk reduction means being more cautious with foods that are difficult to keep at safe temperatures: mayonnaise-dressed salads, cream-filled pastries, custard dishes, dishes made with raw or undercooked egg, and any meat that has been sitting at room temperature for an unknown length of time. Freshly cooked food that is still hot carries substantially lower risk than food that was prepared hours earlier.

If you develop mild symptoms after attending an event and you are otherwise healthy, home management with ORS and rest is appropriate. However, if an elderly family member, a child under two, a pregnant woman, or anyone with diabetes or kidney disease develops symptoms after the same event, do not wait to see how the illness progresses. These groups dehydrate and deteriorate faster and benefit from earlier medical assessment.

When food poisoning points to something else

Bloody diarrhoea with high fever may represent haemorrhagic colitis from enterohaemorrahgic E. coli (EHEC) or Shigella. EHEC is particularly dangerous in children because it can trigger haemolytic uraemic syndrome (HUS), a condition that damages the kidneys and red blood cells and requires urgent hospital care. This is rare but important to know because delaying treatment worsens outcomes significantly.

Diarrhoea that persists for more than two weeks has usually moved beyond the acute food poisoning category and deserves investigation for other causes: intestinal parasites including Giardia and Entamoeba histolytica, both common in the region, inflammatory bowel disease including ulcerative colitis and Crohn's disease, or coeliac disease. A stool examination for parasites and a medical consultation are appropriate at this point.

Some people experience a period of gut sensitivity for several weeks after recovering from food poisoning, with looser stools and increased bloating compared to their baseline. This is recognised as post-infectious irritable bowel syndrome and usually settles with time without specific treatment. It is different from an ongoing infection and does not require more antibiotics.

Groups that need extra caution

Children under two years are most vulnerable to death from dehydration related to food poisoning. Their body fluid makes up a larger proportion of their body weight and they lose it faster. ORS should be started from the first loose stool, offered by teaspoon if the child resists drinking from a cup or bottle. Do not give a homemade salt solution to an infant without medical guidance on the correct concentration.

Elderly people may not feel thirsty even when significantly dehydrated, and their early signs of dehydration can look like confusion or weakness rather than dry mouth. People taking medication for hypertension, heart conditions or diabetes should seek medical advice when they develop significant food poisoning because dehydration alters how these medications work and can cause dangerous interactions.

Pregnancy creates specific vulnerability because Listeria monocytogenes, which contaminates soft cheeses, cold cuts, smoked fish and unpasteurised milk, can cause a mild flu-like illness in the mother while causing severe harm to the fetus including miscarriage, stillbirth or severe newborn infection. Any food poisoning during pregnancy warrants a call to a doctor rather than waiting to see if symptoms settle.

Sources

• Kirk MD, Pires SM, Black RE et al: World Health Organization Estimates of the Global and Regional Disease Burden of 22 Foodborne Bacterial, Protozoal, and Viral Diseases, 2010: A Data Synthesis, PLoS medicine, 2015
• Todd ECD: Foodborne disease and food control in the Gulf States, Food control, 2017
• Gazezova S, Nabirova D, Waltenburg M et al: Salmonellosis outbreak associated with the consumption of food at a wedding in an urban restaurant in Kazakhstan: a retrospective cohort study, BMC infectious diseases, 2024
• King CK, Glass R, Bresee JS et al: Managing acute gastroenteritis among children: oral rehydration, maintenance, and nutritional therapy, MMWR. Recommendations and reports, 2003
• Imdad A, Rani U: Oral Rehydration Salt Solutions for Children: A Review, Pediatrics in review, 2025
• World Health Organization: Food safety fact sheet. WHO, 2022