Food Intolerance Symptoms

Symptoms that follow eating are common, and food is only one of several possible explanations. Stress, sleep, medication, illness, hormones and gut conditions can all produce the same feelings, which is why no screen — including ours — can tell you a food caused a symptom.

What a symptom can do is narrow where you start looking. Bloating that arrives predictably after bread points somewhere different to fatigue that follows any large meal. The pages below set out what people most often report, which foods tend to come up alongside each pattern, and where a symptom warrants a GP appointment rather than a diet experiment.

If a symptom is sudden, severe, or accompanied by weight loss, blood, difficulty breathing or swelling, please see a doctor first. Nothing on these pages is a substitute for that.

Browse by symptom

• Bloating
• Gas & Wind
• Stomach Pain & Cramps
• Tiredness After Eating
• Brain Fog
• Nausea After Eating
• Diarrhoea After Eating
• Constipation
• Itchy Skin & Food
• Joint Pain & Food