Gluten and lactose intolerance

Lactose intolerance happens when the small intestine does not digest lactose, the sugar in milk, effectively. Undigested lactose reaches the bowel and may cause bloating, cramps, gas or diarrhoea after dairy. The amount tolerated can vary, and yoghurt or hard cheese may feel different from a large glass of milk.

Gluten is a protein in wheat, barley and rye. Symptoms after bread, pasta or pastries may reflect coeliac disease, a food intolerance, another ingredient or a digestive condition rather than lactose itself. If dairy is eaten with the suspected gluten food, the meal pattern can be misleading. Symptoms do not identify their cause without assessment.

Record the food, amount, timing and symptoms, including whether the meal contained milk, cream, cheese or ice cream. Note bowel changes and whether symptoms ease when the meal is repeated without dairy. Keep the diary long enough to show a pattern, but do not deliberately provoke severe symptoms.

Ask a clinician whether Food Intolerance Testing is appropriate and whether coeliac evaluation should happen before reducing gluten. A dietitian or Nutrition Counselling service can help you try a limited change while protecting calcium, fibre and overall variety. Lactose-free products may help some people, but they do not answer whether gluten is involved.

Seek medical advice for persistent diarrhoea, repeated abdominal pain, ongoing bloating, weight loss, blood in the stool, fever, vomiting or symptoms that wake you from sleep. Get urgent help for severe pain, faintness, dehydration or swelling of the lips, tongue or throat after food, because that pattern can indicate an allergic emergency rather than intolerance.

Ask whether your symptoms fit lactose intolerance, coeliac disease or another condition; whether you should continue gluten before testing; and how to assess dairy without removing unnecessary foods. Request advice on suitable alternatives and the symptoms that should trigger urgent review.