What counts as constipation, what commonly causes it, the everyday changes to fibre, fluids, movement and toilet habits that health services suggest, and the signs that mean it is time to see a doctor.
Which digestive problems become more common with age, how medicines can affect the gut, why fibre, fluids and activity still matter, how bowel cancer screening works, and the warning signs to take to a doctor.
What each letter of FODMAP stands for, why these carbohydrates cause symptoms in some people, how the low FODMAP approach works as a short, dietitian-led process, and what fructose malabsorption is.
What gluten is and where it is found, how coeliac disease, wheat allergy and non-coeliac gluten sensitivity differ, why you should be tested before cutting out gluten, and what living gluten-free involves.
What histamine intolerance is and how uncertain the evidence still is, how sulphites can affect people with asthma, which additives come up most often, how to read labels, and why to get a diagnosis before cutting out foods.
What each part of the digestive system adds, how long food takes to pass through, how nerves, hormones and gut bacteria are involved, and what happens when the pancreas cannot make enough digestive enzymes.
What irritable bowel syndrome (IBS) is, its symptoms, how doctors diagnose it and rule out other conditions, common triggers, how a food diary helps, and practical eating patterns at suhoor and iftar if you plan to fast.
What lactose intolerance is and why it happens, how it differs from a milk allergy, how it is diagnosed, how much dairy many people can still have, and how to get enough calcium.