
What is Food Poisoning?
Food poisoning, also known as food-borne illness, occurs when a person consumes contaminated, spoiled, or toxic food. The most common symptoms include nausea, vomiting, and diarrhea. Despite its discomfort, food poisoning is common.
The Centers for Disease Control and Prevention (CDC) reports that about 48 million people in the U.S. (1 in 7) experience food poisoning annually, with 128,000 requiring hospitalisation (Gould et al., 2007).

Food Poisoning Symptoms
In my clinical experience, most all cases of food poisoning generally involve mild symptoms, although they may seem to be severe to the sufferer.
The more common symptoms of food poisoning vary depending on the infection source, but the most common symptoms include abdominal cramps, diarrhoea, nausea and vomiting, a mild fever, weakness, and headaches.
Severe Food Poisoning Symptoms
that may indicate a life-threatening situation include:
Seek immediate medical attention if these severe symptoms arise.
Duration of Food Poisoning
The onset of food poisoning symptoms can vary, appearing anywhere from 30 minutes to 8 weeks after consuming contaminated food. Most cases resolve within 1 week, with or without treatment.
Causes of Food Poisoning
Food poisoning is primarily caused by:
These pathogens are present in nearly all foods. However, most pathogens are destroyed during cooking. Raw foods or those handled improperly are common sources of contamination.
Commonly contaminated foods include:
Bacterial Causes
Bacteria are the leading cause of food poisoning especially E.coli (Shiga toxin-producing strains, or STEC). Salmonella is responsible for 1.35 million U.S. cases and 26,500 hospitalisations annually (CDC).
Key bacterial culprits include:
Campylobacter Jejuni: Understanding, Prevention, and Treatment
Food poisoning is a widespread issue, with Campylobacter jejuni being one of the leading bacterial causes of infection worldwide, alongside Salmonella. Symptoms vary from mild discomfort to severe dehydration, and it often leads to diarrhea. Contaminated food, especially poultry, shellfish, and unpasteurized milk, are the primary sources of infection.
Causes of Campylobacter Infection
Symptoms of Campylobacter Infection
Many patients exhibit “never been well since” patterns, with lingering gastrointestinal issues potentially triggering secondary infections or long-term problems like E. coli or fungal overgrowths.
Campylobacter Enterotoxin and Infection Mechanism
Campylobacter produces an enterotoxin that alters intestinal permeability, causing diarrhoea by increasing bowel fluid secretion. The bacteria can evade detection by invading and hiding in intestinal cells, which may lead to “false negatives” in stool tests (Sheppard et al., 2015).
Food Poisoning Natural Treatment Options
The good news is that food poisoning is rarely life-threatening, and most individuals recover within a few days without treatment. While many cases resolve without medication, natural remedies can help expedite recovery.
Conclusion
By practicing good hygiene, safe food handling, and considering natural treatments, you can protect yourself from Campylobacter jejuni infections.
Prevention is key, especially when it comes to poultry and shellfish, and maintaining a strong digestive system is crucial for long-term health.
Parasitic Causes
Though less common than bacterial food poisoning, parasites pose serious risks, particularly to those with weakened immune systems. Common parasites include:
Parasites can sometimes remain in the digestive tract for years, particularly affecting pregnant individuals and those with compromised immune systems.
Viral Causes
Viruses also contribute to food-borne illnesses. Noro virus causes 19 to 21 million U.S. cases of vomiting and diarrhoea annually.
Key viral pathogens include:
Key Food Reaction Groups
Here are some common categories of food reactions:
Reactive Foods List
The most reactive foods vary depending on the individual, but many elimination diets tend to highlight certain culprits that trigger responses in people with food sensitivities.
An elimination diet helps isolate these triggers through the systematic removal and reintroduction of these foods. The full elimination and food challenge is a part of the Ultimate Candida Cleanse Program.
Foods That Increase Risk of Food Poisoning
High-risk foods include:
Food Poisoning Treatments
Home Treatment for Mild Cases
Most cases of food poisoning can be treated at home. Important treatments include:
Stay Hydrated
Herbal teas such as chamomile and peppermint can soothe an upset stomach.
Over-the-Counter (OTC) Medications
Prescription Medications
In severe cases, a doctor may prescribe specific medications based on the pathogen involved:
Medications can be crucial for pregnant individuals and immunocompromised individuals, as certain infections may pose serious risks to unborn babies.
What to Eat and Avoid After Food Poisoning
Foods to Eat
Once vomiting and diarrhea subside, gradually reintroduce bland, easy-to-digest foods:
Foods to Avoid
To prevent further stomach upset, avoid:
Also, steer clear of:
Diagnosis of Food Poisoning
In mild cases, a doctor may diagnose food poisoning based on symptoms. For severe cases, diagnostic tests may include:
Risk Factors for Food Poisoning
Anyone can get food poisoning, but certain groups are more vulnerable:
Prevention of Food Poisoning
To reduce the risk of food poisoning:
Foods to handle with care:
Frequently Asked Questions
What’s the Difference Between Food Poisoning and a Stomach Bug?
Final Take-Away
Millions suffer from food poisoning each year, but most cases resolve without medical intervention. Prevention is key—always handle food safely, wash your hands, and avoid raw or undercooked foods.

Eric Bakker N.D.
Greetings! I am a naturopathic physician from New Zealand. Although I’ve retired from clinical practice since 2019 after 34 years of clinic. I remain passionate about helping people improve their lives. You’ll find I’m active online with a focus on natural health and wellbeing education through my Facebook page, Reddit page and YouTube channel, including this website.