By Suraj Karowa / ANW
London, December 16, 2025

Several kinds of bacteria can give you an upset stomach. Here is how to steer clear of the worst offenders, and what to do if they do make it through.
– As families across the UK gear up for Christmas dinners laden with roast turkey, mince pies, and festive buffets, health experts are issuing stark warnings about a surge in food poisoning cases.
With the holiday season in full swing, reports from the NHS indicate a 15% uptick in gastrointestinal complaints compared to last year, attributing the rise to lapses in food handling amid the chaos of party preparations.
“The festive rush often leads to shortcuts – leaving rice out too long or cross-contaminating boards – and that’s when bacteria strike,” says Dr. Masarat Jilani, an NHS gastroenterologist specializing in infectious diseases.
Food poisoning, or foodborne illness, strikes an estimated 1 in 10 people annually in the UK, according to Food Standards Agency (FSA) data. But the numbers tell only part of the story.

Beware the bacteria … they can lurk in every crevice.
What happens inside the body when that turkey leg or creamy trifle turns traitor? It’s a microbial battlefield, where pathogens like Salmonella, E. coli, and Campylobacter wage war on your gut, leading to symptoms ranging from mild nausea to life-threatening dehydration.
The culprits are diverse, each with its own modus operandi. Take Bacillus cereus, a sneaky bacterium often lurking in reheated rice – a staple in many holiday leftovers.
It produces heat-stable toxins before you even ingest it, triggering violent vomiting within hours. “It’s like a pre-loaded bomb,” explains Dr. Emma Doughty, an infectious disease researcher at the University of Manchester.
“By the time you’re ill, the damage is done.” In contrast, Salmonella and E. coli multiply in the intestines post-meal, inflaming the gut lining and causing prolonged diarrhea that can last days.

Beige food – bananas, rice, applesauce and toast, among other things – is best for an upset stomach.
Campylobacter jejuni, frequently found in undercooked poultry, adds a twist: its spiral shape allows it to burrow through intestinal walls like a corkscrew, evading immune defenses.
Then there’s Shigatoxigenic E. coli (STEC), notorious for releasing Shiga toxins that can escalate to hemolytic uremic syndrome, a kidney-damaging condition especially dangerous for children and the elderly.
Antibiotics? Often a no-go. “Killing the bacteria can release a toxin flood, worsening the illness,” Doughty notes. Diagnosis relies on stool tests, but with overwhelmed holiday clinics, most cases are managed at home with hydration and rest.
This year’s spike isn’t just anecdotal. The UK Health Security Agency (UKHSA) logged over 8,000 confirmed cases in November alone, with projections for December pushing toward 12,000.
Climate change plays a role too: warmer winters have extended the breeding season for pathogens in livestock, while global supply chains bring exotic risks like Vibrio in imported oysters.
“Oysters are a perennial gamble,” Jilani warns. “Raw meat trends, like medium-rare burgers at barbecues, are troubling – mince needs thorough cooking since bacteria can infiltrate every grind.”
Social media isn’t helping. TikTok videos glorifying “chicken washing” – rinsing raw poultry under the tap – have racked up millions of views, despite FSA campaigns debunking the myth.
Splashing water aerosolizes bacteria, spreading them to counters, sinks, and even nearby salads. “It’s counterproductive,” says Doughty. “Heat kills germs; water just relocates them.”
Prevention boils down to basics, yet compliance wanes under festive pressure. The “four Cs” – clean, cook, chill, cross-contamination – remain golden rules.
Wash hands rigorously after toilet use or handling raw meat; use separate boards for poultry and veg; cool leftovers within two hours and fridge them promptly; cook to safe temps (75°C for poultry).
Meat thermometers are cheap insurance – £5 at most supermarkets – but only 30% of Brits own one, per a recent Which? survey.
For those hit hard, recovery focuses on rehydration. Oral rehydration salts (ORS) packets, available over-the-counter for £2, replace lost electrolytes better than plain water.
The BRAT diet – bananas, rice, applesauce, toast – eases the gut back into action, providing bland, binding carbs without irritation.
But watch for red flags: persistent fever over 38°C, bloody stools, or dizziness signaling sepsis. “Call 111 immediately,” Jilani urges. “Sepsis kills in hours if untreated.”
Longer-term, some face post-infectious irritable bowel syndrome (IBS), with chronic pain and bloating affecting 10-20% of severe cases. Mental health takes a hit too – the embarrassment of sudden dashes to the loo can linger.
Experts like Doughty call for systemic fixes: better farm biosecurity, clearer labeling on imports, and education in schools.
“Food poisoning isn’t inevitable; it’s preventable negligence,” she says. The FSA’s “Safer Food, Better Business” toolkit, free online, offers tailored advice for home cooks and caterers.
As plates pile high this Christmas, remember: joy comes from shared meals, not shared misery. Ditch the tongs for fresh ones mid-barbie, skip the raw oyster shots, and toast with safely chilled bubbly. Your stomach – and guests – will thank you.
In the spirit of the season, the Guardian’s Feast app launches a holiday hygiene feature today, with interactive checklists and timer alerts for chilling times. Download it for a worry-free feast.
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