Basic concepts

Recording food immediately after eating captures the item, approximate portion, ingredients, time, and circumstances before they are forgotten. It therefore reduces recall bias and can reveal skipped meals, repeated snacks, sugary drinks, or other patterns that a person may overlook later. A diary is most useful when entries are honest and sufficiently detailed.

Clinical nutrition depends on understanding nutrients, digestion, absorption, energy needs, requirements, and assessment. These basic ideas allow a professional to modify an ordinary diet safely for a disease or medical condition. Without them, therapeutic diet planning would lack a scientific foundation.

Basal metabolic rate, or BMR, is the energy the body requires at rest to maintain essential functions such as breathing, circulation, and temperature regulation. It forms a starting point for estimating total energy needs, after considering activity, growth, illness, and other factors.

Macronutrients are nutrients required in relatively large amounts. Carbohydrate and fat mainly provide energy, while protein supports growth, repair, and other functions; all three are macronutrients. Vitamins and minerals are micronutrients, and water is also essential despite not supplying energy.

Nutrient density means that a food supplies a relatively large amount of essential nutrients in relation to its energy or serving size. A person with poor appetite may eat only small portions, so nutrient-dense choices help provide protein, vitamins, minerals, and other needed nutrients without requiring a large volume of food. Examples may include milk, eggs, pulses, nuts, and fortified foods, selected according to the person’s condition. Thus option A is correct.

A person who has been consuming very little fibre may develop gas, abdominal fullness, cramps, or discomfort if fibre is increased suddenly. Gradual addition gives the digestive system time to adapt and is usually combined with adequate fluid intake and regular movement, unless a medical condition requires a different plan. Fibre should come from foods such as whole grains, pulses, vegetables, fruits, and seeds. Therefore, option A is correct.

Tea contains polyphenols, including tannins, which can bind with non-haem iron and reduce its absorption. This is particularly relevant when meals rely on plant sources or when a person has iron deficiency. Separating tea from meals and using vitamin C sources can support iron absorption.

Home preparation does not automatically guarantee a healthy meal. Excess oil can raise energy density, excess salt can increase sodium intake, and excess sugar adds calories with limited nutrient value. Healthfulness depends on ingredients, preparation method, portion size, variety, and food safety.

Raw meat, eggs, fish, and unwashed produce may carry harmful microorganisms. If the same knife or board is used for ready-to-eat food, those organisms can transfer through cross-contamination. Separate, properly cleaned equipment reduces this risk and helps protect consumers from foodborne infection.

Nutrition education is not successful merely because a learner can repeat definitions or list nutrients. Its practical outcome appears when knowledge influences decisions and produces healthier behaviour, such as choosing a varied diet, following safe food practices, controlling portions, and maintaining suitable meal habits. Hence option B is correct.

Diet counselling works only when the client understands the advice and can apply it in daily life. Excessively technical or difficult language may create confusion, embarrassment, and misunderstanding. The person may then fail to follow meal instructions correctly. Clear, simple, culturally suitable language improves comprehension and compliance, so option C is correct.

Cutting vegetables into very small pieces increases the surface exposed to air and water. Prolonged cooking, especially in excess water, can destroy heat-sensitive vitamins and allow water-soluble vitamins and minerals to leach into the cooking liquid. Appropriate cutting and shorter cooking help retain nutrients, so option A is correct.

Ageing may be accompanied by dental problems, reduced appetite, slower digestion, difficulty swallowing, chronic disease, and altered nutrient requirements. Meals should therefore have suitable texture, adequate protein and micronutrients, moderate salt and sugar, and appropriate portions, while respecting medical advice. Hence option C is correct.

Protein is essential, but a high-protein diet alone cannot supply every requirement. The body also needs energy from carbohydrate and fat, essential fatty acids, vitamins, minerals, fibre and water. Adequate energy prevents protein from being unnecessarily burned as fuel. Therefore, the diet should be balanced and modified according to age, health status, kidney function and professional advice.

Whole grains retain more of the grain components, especially the bran and germ, than refined grains. Consequently, they can contribute carbohydrate energy together with dietary fibre, B vitamins, minerals and bioactive compounds. Fibre supports bowel function and may improve satiety and glucose control. Whole grains are nutritious foods, not medicines, and they still contain digestible carbohydrate.

Essential fatty acids are called essential because the human body cannot synthesise enough of them to meet physiological needs. They must therefore be obtained through food, such as suitable vegetable oils, nuts, seeds and other sources. They contribute to cell membranes and signalling functions. Essential does not mean toxic, and eliminating all dietary fat can create nutritional problems.

Most water-soluble vitamins, particularly vitamin C and many B vitamins, are not stored in large quantities in the body. Regular dietary intake helps maintain adequate status, and deficiency can develop when intake or absorption remains poor. Excess is often excreted in urine, but this does not make very high-dose supplements automatically safe; toxicity and interactions are still possible for some vitamins.

Fat-soluble vitamins A, D, E and K are absorbed with dietary fat and can be stored in body tissues, especially the liver and adipose tissue. Repeated high-dose supplementation may therefore accumulate and produce adverse effects, unlike the assumption that all excess is simply excreted. Supplements should be taken for a clear indication and in an appropriate dose, with professional guidance when necessary.

Iodine in iodized salt can be lost to some extent through prolonged heating, moisture and improper storage. Adding the salt later in cooking, keeping the container covered and dry, and avoiding unnecessary repeated heating may help preserve more iodine. Iodized salt supplies iodine needed for thyroid hormone production; it is not an energy source and should still be used in moderation.

Sodium and potassium are charged minerals, so they function as electrolytes in body fluids. Their concentrations help regulate fluid distribution, osmotic balance, nerve impulse transmission and muscle contraction, including cardiac activity. The kidneys and hormones help maintain their levels. Severe imbalance can be dangerous, so supplementation or restriction should be based on clinical assessment rather than a general assumption.

The small intestine provides a very large absorptive surface through its length, folds, villi and microvilli. Digestive enzymes and bile make nutrients available for uptake, while specialised cells transport sugars, amino acids, fatty acids, vitamins, minerals and water into blood or lymph. Although some absorption occurs elsewhere, the small intestine is the principal site for most digested nutrient absorption.

Waist circumference is a practical indicator of central or abdominal fat, particularly visceral fat around internal organs. Excess visceral fat is associated with insulin resistance, abnormal blood lipids, hypertension and greater cardiometabolic risk, even when BMI does not fully reveal the risk. Waist measurement is not a diagnosis by itself; it should be interpreted with sex, population cut-offs, medical history and other clinical indicators.

Body weight is the combined result of muscle, fat, bone, water and other tissues, so it cannot show every nutritional change. A person may lose muscle while gaining fat or retaining fluid and still weigh the same. Therefore, nutritional assessment should also consider body composition, diet history, physical signs, biochemical findings and functional condition.

Clinical signs and biochemical values provide different kinds of information and may be influenced by illness, medicines, inflammation, hydration or timing of testing. A sound nutrition assessment therefore interprets both findings together with diet history, medical history, physical examination and disease condition instead of relying on one indicator alone.

Dietary intake often changes according to work, school, holidays, social events and family routines. A weekday-only history may therefore miss restaurant meals, snacks, celebrations or irregular portions eaten at weekends. Asking about weekend intake helps the assessor obtain a more representative picture of usual eating habits and nutrient exposure.