Diet, Health Conditions & Lifestyle Choices

Why Diets Need to Change

A single “standard healthy eating” meal plan cannot meet the needs of every person. Medical diagnoses, ethical choices and religious beliefs all create specific dietary requirements that a food-competent person must be able to plan around. This lesson covers three overlapping groups: those with medical dietary needs or nutritional deficiencies, those who have made lifestyle choices such as vegetarianism or veganism, and those whose religious observances shape what they eat. In your exam, you may be given a scenario featuring any one of these individuals and asked to plan a meal, modify a recipe or evaluate a diet — so knowing the specific requirements in each category is essential.

Medical Conditions and Nutritional Deficiencies

Coeliac Disease

Coeliac disease is an autoimmune condition triggered by gluten — the protein found in wheat, barley and rye. When a person with coeliac disease eats gluten, their immune system attacks the lining of the small intestine, damaging the villi that absorb nutrients. This leads not only to digestive symptoms but also to malabsorption of iron, calcium and B vitamins. The only treatment is a strict, lifelong gluten-free diet: replacing wheat flour with rice flour, cornflour, buckwheat or certified gluten-free alternatives. A student baking a sponge cake for a coeliac friend would substitute gluten-free self-raising flour and check that all other ingredients (including baking powder) are certified gluten-free.

Type 2 Diabetes

Type 2 diabetes develops when the body becomes resistant to insulin or cannot produce enough. Insulin is the hormone that moves glucose from the bloodstream into cells. When it fails, blood glucose remains dangerously high after meals. The dietary priorities are: reducing free sugars and refined carbohydrates (white bread, sugary drinks), increasing NSP to slow glucose absorption, choosing lower-glycaemic-index carbohydrates (oats, pulses, wholegrain bread), reducing saturated fat to manage cardiovascular risk, and maintaining a healthy body weight. A person with type 2 diabetes replacing their usual white-rice side dish with brown rice, adding lentils to a curry and choosing water instead of fruit juice is making four evidence-based improvements simultaneously.

Iron Deficiency Anaemia and Cardiovascular Disease

Iron deficiency anaemia occurs when the body lacks sufficient iron to produce adequate haemoglobin, the protein in red blood cells that carries oxygen. Symptoms include fatigue, pallor, shortness of breath and impaired concentration. Dietary management focuses on increasing haem iron (found in red meat, liver, sardines — the most bioavailable form) and non-haem iron (spinach, lentils, fortified cereals) alongside vitamin C-rich foods, which enhance non-haem iron absorption. Tannins in tea and coffee inhibit iron absorption, so a person with anaemia is advised to avoid drinking them with iron-rich meals.

Cardiovascular disease (CVD) — including coronary heart disease (CHD) — is strongly linked to elevated LDL cholesterol, which builds up as plaques (atherosclerosis) on artery walls, narrowing them and raising the risk of heart attack or stroke. High saturated fat intake raises LDL cholesterol. Dietary management involves replacing saturated fats (butter, lard, fatty cuts of meat, hard cheese) with unsaturated fats (olive oil, avocado, oily fish); increasing NSP (which binds cholesterol in the gut and helps excrete it); reducing salt (which raises blood pressure, increasing CVD risk); and limiting free sugars. Liver disease may also affect the body’s ability to process fat-soluble vitamins and cholesterol, requiring additional medical dietary guidance.

Other Conditions: Obesity, Dental Caries, Calcium Deficiency and Intolerances

Obesity management requires a sustained negative energy balance — consuming fewer calories than expended — achieved through reducing energy-dense foods (high fat, high free sugar) and increasing physical activity, not through extreme restriction. Dental caries (tooth decay) results from sugar-fermenting bacteria producing acid that erodes tooth enamel; the dietary fix is reducing frequency of free sugar consumption, particularly between meals. Calcium deficiency (affecting bone health and increasing risk of osteoporosis) is addressed by increasing dairy products, fortified plant milks, tinned fish with bones and green leafy vegetables. Nut intolerance requires strict avoidance of tree nuts and peanuts (a legume) and vigilant reading of food labels. Lactose intolerance (inability to digest lactose, the sugar in milk) requires either avoidance of dairy or use of lactase enzyme supplements; plant-based milks (soya, oat, almond) are common substitutes, but calcium levels vary and must be checked.

Vegetarian and Vegan Diets

The spec names three categories of vegetarian diet that must be known precisely. A lacto-ovo vegetarian eats dairy and eggs. A lacto vegetarian eats dairy but not eggs. A vegan avoids all animal products including dairy, eggs and honey. The key nutritional risks increase as animal foods are excluded: protein quality (essential amino acid completeness), vitamin B12 (found almost exclusively in animal products; vegans must supplement or use fortified foods), calcium (if dairy is excluded), iron (non-haem only, less bioavailable), zinc and omega-3 fatty acids (limited plant sources). Protein complementation — combining plant proteins across meals to ensure all nine essential amino acids are present — is particularly relevant for vegans: rice and lentils together provide a complete amino acid profile that neither provides alone.

Religious Dietary Requirements

Religious beliefs create clear and consistent dietary requirements that food professionals must understand and respect. The spec specifically names Hindu, Muslim and Jewish dietary rules. These are observed as part of religious life and are not “preferences” — they are obligations for practising adherents.

Muslim dietary law (Halal): Halal means permitted in Arabic. Pork and all pork derivatives (including lard, gelatine from pork) are prohibited. Alcohol is also forbidden, so dishes containing wine, beer or spirits cannot be served. Meat must be slaughtered in a specific way with a blessing. Processed foods require certification to confirm no cross-contamination with haram (forbidden) ingredients. Planning a meal for a Muslim family means ensuring all meat is Halal-certified, that no pork-derived additives are present, and that alcohol is absent from any ingredient including marinades or sauces.

Jewish dietary law (Kosher): Kosher means fit or proper in Hebrew. Pork and shellfish are not permitted. Meat must come from animals that have cloven hooves and chew cud (beef, lamb). Meat and dairy must not be prepared, cooked or eaten together, which has significant kitchen implications — separate utensils, pots, plates and storage areas are required. Fish with fins and scales is permitted; shellfish is not. A Kosher deli sandwich would use either a meat filling or a cheese filling, never both.

Hindu dietary practice: Many Hindus are vegetarian, particularly those following strict observance, because of the principle of ahimsa (non-violence towards living creatures). Beef is forbidden for most Hindus — the cow is a sacred animal. Many also avoid pork. Dairy products (milk, ghee, yoghurt) are widely used and considered pure. Some Hindu communities fast on certain days and avoid particular foods (onion, garlic) for spiritual reasons. A Hindu vegetarian wedding buffet might feature paneer (fresh cheese), lentil dal, vegetable curries, rice and yoghurt-based raita — all consistent with a lacto-vegetarian diet.