2025 CCEA AS-Level Nutrition and Food Science 3310 模擬試題連答案詳解

Water-soluble vitamins dissolve in water and are not stored in the body to any significant extent, so they generally need to be consumed regularly. The water-soluble vitamins studied are vitamin B1 (thiamin), vitamin B2 (riboflavin), niacin, vitamin B6, vitamin B12, folate and vitamin C. Any two of these is correct.

[1] mark for each correctly named water-soluble vitamin, up to [2]. Accept: B1/thiamin; B2/riboflavin; niacin; B6; B12; folate; vitamin C. Reject fat-soluble vitamins (A, D, E, K).

Major minerals are required by the body in relatively larger amounts than trace minerals. The major minerals studied are calcium, magnesium, phosphorus, potassium and sodium. Any two of these is correct.

[1] mark for each correctly named major mineral, up to [2]. Accept: calcium; magnesium; phosphorus; potassium; sodium. Reject trace minerals (e.g. iron, zinc, iodine, fluorine, selenium).

Non-starch polysaccharide (NSP), commonly referred to as dietary fibre, is found in the cell walls of plant foods. Good food sources include wholegrain bread and cereals, vegetables, fruit (particularly with skins), and pulses such as beans and lentils.

[1] mark for any valid NSP/fibre-rich food source, e.g. wholegrain bread/cereals, vegetables, fruit, pulses.

Omega-3 polyunsaturated fatty acids are essential fatty acids that the body cannot make itself. Valuable food sources include oily fish such as salmon or mackerel, as well as plant sources such as walnuts and flaxseed (linseed).

[1] mark for any valid omega-3 source, e.g. oily fish (salmon/mackerel/sardines), walnuts, flaxseed/linseed.

Function: iodine is an essential component of thyroid hormones (thyroxine), which are produced by the thyroid gland and regulate the body's basal metabolic rate, as well as playing an important role in normal growth and development. Deficiency effects: iodine deficiency impairs the thyroid gland's ability to produce sufficient thyroid hormone; in response, the thyroid gland can enlarge in an attempt to capture more iodine, resulting in a visible swelling in the neck known as goitre. Iodine deficiency also reduces metabolic rate, and if deficiency occurs during pregnancy, it can severely affect the neurological development of the unborn baby, potentially causing irreversible cognitive impairment.

Function (up to [2]): [1] component of thyroid hormone + [1] regulates metabolic rate/growth and development. Deficiency (up to [3]): [1] thyroid gland enlarges (goitre) + [1] reduced metabolic rate + [1] risk to neurological development of the unborn baby if deficient during pregnancy. Maximum [5].

Intrinsic sugars are contained within the intact cell structure of a food (such as whole fruit); because the cell walls must first be broken down during digestion, these sugars are released and absorbed relatively gradually, causing a more moderate rise in blood sugar than an equivalent amount of extrinsic/free sugar. Starch is a complex carbohydrate that must be broken down by digestive enzymes into glucose before it can be absorbed; the speed of this breakdown, and therefore the resulting rise in blood sugar, varies depending on the type of starch and the physical structure of the food (for example, finely milled/refined starchy foods tend to raise blood sugar more quickly than wholegrain, less processed starchy foods). Non-starch polysaccharide (NSP) cannot be broken down by human digestive enzymes at all, so it passes through the small intestine largely undigested and does not directly raise blood sugar; importantly, NSP present in a meal also slows the rate at which other sugars and starches in that meal are digested and absorbed, helping to blunt and slow the overall rise in blood glucose after the meal.

[1]-[2] correct explanation of intrinsic sugars (released/absorbed gradually from within the food's cell structure, moderate rise in blood sugar). [1]-[2] correct explanation of starch (broken down to glucose, rate depends on food type/processing). [1]-[2] correct explanation of NSP (not digested, does not directly raise blood sugar, slows absorption of other carbohydrates in the same meal). Maximum [5].

Functions: water helps regulate body temperature, largely through sweating and evaporative cooling; it forms the main component of blood plasma, allowing the transport of nutrients, oxygen, hormones and waste products around the body; it acts as a lubricant, for example within joints and around organs; and it provides the medium in which many of the body's chemical reactions take place. Factor affecting hydration: climate is one factor that can significantly impact hydration status - in hot conditions, the body sweats more in order to regulate temperature, increasing fluid losses; if these losses are not adequately replaced through increased fluid intake, an individual's hydration status will decline, increasing the risk of dehydration.

Functions (up to [3]): [1] mark for each correct function, e.g. temperature regulation, transport medium (blood plasma), lubrication, medium for chemical reactions (any three). Factor (up to [2]): [1] correctly identified valid factor (e.g. climate, physical activity level, illness, availability of fluids) + [1] developed explanation of its impact on hydration. Maximum [5].

Pregnant women have increased requirements for several nutrients to support the growth and development of the baby. Folate requirements increase significantly during pregnancy; adequate folate intake, and supplementation with folic acid (recommended before conception and continued through the first 12 weeks of pregnancy), is important because it reduces the risk of neural tube defects (such as spina bifida) in the developing baby, which can occur very early in pregnancy, often before a woman knows she is pregnant. Iron requirements also increase during pregnancy, as the mother's blood volume expands substantially to support the growing baby and placenta, and iron is needed to support this increase in blood volume as well as to supply the developing baby's own iron stores; inadequate iron intake during pregnancy increases the risk of maternal iron-deficiency anaemia.

Folate (up to [2]-[3]): [1] folate needs increase in pregnancy + [1] linked to folic acid supplementation before conception/early pregnancy + [1] reduces risk of neural tube defects. Iron (up to [2]-[3]): [1] iron needs increase in pregnancy + [1] linked to expanded blood volume/supply to baby + [1] reduces risk of maternal anaemia. Maximum [5] overall (award the best five marking points across both nutrients).

A Lower Reference Nutrient Intake (LRNI) is a Dietary Reference Value representing the amount of a nutrient that is sufficient to meet the needs of only the small proportion of a population group (about 2.5%) who have the lowest requirements for that nutrient; most individuals in the group will need more than the LRNI to meet their own personal requirement, meaning an intake persistently below the LRNI is very likely to be inadequate for almost everyone. This differs from an Estimated Average Requirement (EAR), which represents the AVERAGE requirement across the whole group - by definition, roughly half of the individuals in that group will need more than the EAR, and roughly half will need less. The LRNI is therefore set considerably lower than the EAR for the same nutrient and group, reflecting the lowest end of individual variation in requirement rather than the average.

[1]-[2] LRNI correctly described as the amount sufficient for only a small proportion (e.g. approx. 2.5%) of the group with the lowest requirements. [1]-[2] correct comparison with EAR (average requirement, roughly half above/half below) and the point that LRNI is set below the EAR. Maximum [4].

Structure: a saturated fatty acid has a carbon chain in which every carbon atom is bonded to the maximum possible number of hydrogen atoms, meaning there are no carbon-carbon double bonds along the chain (it is 'saturated' with hydrogen). A polyunsaturated fatty acid, in contrast, has two or more carbon-carbon double bonds within its carbon chain, meaning it is not fully saturated with hydrogen. Effect on blood cholesterol: diets high in saturated fatty acids tend to raise the level of low-density lipoprotein (LDL) cholesterol ('bad' cholesterol) in the blood, which is associated with an increased risk of cardiovascular disease. Polyunsaturated fatty acids, when consumed in place of saturated fat, tend to have the opposite effect, helping to lower LDL cholesterol levels, which is why dietary guidance generally recommends replacing saturated fat with unsaturated fat sources where possible.

[1] correct structural description of saturated fatty acids (no carbon-carbon double bonds). [1] correct structural description of polyunsaturated fatty acids (two or more carbon-carbon double bonds). [1] correct effect of saturated fat on blood cholesterol (raises LDL cholesterol). [1] correct effect of polyunsaturated fat on blood cholesterol (helps lower LDL cholesterol when replacing saturated fat). Maximum [4].

Role: vitamin A is required for the normal function of the retina in the eye, particularly for vision in low light conditions; it also supports normal function of the immune system, helping to protect against infection, and contributes to the health of skin and mucous membranes, which act as a barrier against pathogens. Deficiency effects: a deficiency of vitamin A commonly causes night blindness (an inability to see well in low light), and if deficiency is severe or prolonged, it can progress to permanent blindness. Vitamin A deficiency also weakens the immune system, increasing an individual's susceptibility to infections.

Role (up to [2]): [1] needed for normal vision (particularly in low light) + [1] needed for healthy immune function/skin (either). Deficiency (up to [2]): [1] night blindness + [1] risk of permanent blindness/increased susceptibility to infection. Maximum [4].

Function: iron is an essential component of haemoglobin, the protein within red blood cells responsible for binding to and transporting oxygen from the lungs to tissues throughout the body; without adequate iron, the body cannot produce enough functional haemoglobin, which is why iron deficiency leads to anaemia and associated symptoms such as fatigue. Sources: valuable dietary sources of iron include red meat (a source of well-absorbed haem iron) and plant-based sources such as pulses (for example lentils or beans) or iron-fortified breakfast cereals (sources of non-haem iron). Absorption: because non-haem iron from plant sources is less readily absorbed than haem iron, the woman's absorption of iron from plant-based sources could be improved by consuming a source of vitamin C (for example a glass of orange juice, or including peppers) at the same meal, as vitamin C enhances the absorption of non-haem iron in the gut.

Function (up to [2]): [1] component of haemoglobin + [1] haemoglobin carries oxygen around the body. Sources (up to [2]): [1] mark for each correct valuable source (e.g. red meat, pulses, fortified cereals), up to [2]. Absorption factor (up to [2]): [1] vitamin C identified as the factor + [1] correct explanation that it enhances absorption of non-haem iron. Maximum [6].

Dietary Reference Values (DRVs) are a set of estimates of the energy and nutrient requirements of different groups of healthy people within the UK population, broken down by age and sex, and include several specific types of reference value such as Estimated Average Requirements (EARs), Reference Nutrient Intakes (RNIs) and Lower Reference Nutrient Intakes (LRNIs). To assess whether the client's diet is adequate, the dietitian would first need to record and analyse the client's actual dietary intake, for example through a food diary, to calculate their average daily energy and nutrient intake. This actual intake could then be compared against the relevant DRV and EAR for the client's specific age and sex group; if the client's energy intake is close to or above the EAR for their group, and their nutrient intakes are close to or above the relevant RNI, their diet is more likely to be adequate. If intakes fall notably below these reference values (for example, close to or below the LRNI for a nutrient), this would suggest the diet may be inadequate in that respect and could be prioritised for dietary advice or intervention.

[1]-[2] DRVs correctly explained as reference values estimating nutrient/energy needs of population groups by age/sex. [1] correct point that the client's actual intake must first be assessed/calculated (e.g. via a food diary). [1]-[3] correct explanation of comparing actual intake against the relevant EAR/RNI/LRNI to judge adequacy, excess or deficiency. Maximum [6].

A breastfeeding (lactating) mother has increased nutritional needs compared with a non-pregnant, non-lactating woman, in order to support the production of breast milk and to protect her own nutritional stores. Energy requirements increase to provide the extra energy needed to produce milk. Protein requirements increase, as protein is a key component of breast milk. Calcium requirements remain elevated to support milk production while protecting the mother's own bone health. Fluid requirements also increase substantially, since breast milk itself is largely composed of water. These increased needs can be met through appropriate food choices, for example: eating regular, well-balanced meals and nutritious snacks to meet increased energy needs; including good sources of protein (such as lean meat, fish, eggs, dairy or pulses) at meals; including calcium-rich foods such as dairy products (or fortified alternatives) regularly; and increasing fluid intake throughout the day, for example by drinking a glass of water each time she breastfeeds.

1 mark per valid point, up to [6]: increased energy needs [1]; increased protein needs [1]; increased calcium needs [1]; increased fluid needs [1]; a valid food-based strategy to meet energy/protein needs (e.g. regular balanced meals, protein sources) [1]; a valid food-based strategy to meet calcium/fluid needs (e.g. dairy foods, increased fluid intake) [1]. All other valid points given credit.

A high-scoring answer discusses both sources/functions and evaluates several alternative fluids with balanced detail.

Sources: fluid in the diet comes not only from directly drinking water, but also from other beverages (such as milk, tea, coffee, fruit juice and soft drinks) and from the water content of foods themselves, particularly fruit, vegetables and soups, which can contribute a meaningful proportion of total daily fluid intake.

Functions: water performs several essential functions, including regulating body temperature (through sweating), acting as the main component of blood plasma to transport nutrients, oxygen and waste products around the body, lubricating joints and tissues, and providing the medium for the body's many chemical reactions.

Evaluating other fluids: milk provides fluid alongside valuable nutrients such as protein, calcium and B vitamins, making it a nutritionally valuable fluid choice, particularly for children and older adults. Fruit juice provides fluid alongside vitamin C and some other micronutrients from the fruit; however, because juicing breaks down the fruit's cell structure, the sugars in fruit juice are classed as non-milk extrinsic sugars (NMES), meaning fruit juice can also contribute significantly to sugar intake if consumed in excess, and is generally recommended to be limited to a small portion per day. Tea and coffee provide fluid and contain antioxidant compounds, but also contain caffeine, which has a mild diuretic effect (increasing urine output), meaning it may be slightly less effective at contributing to hydration than an equivalent volume of plain water, particularly if consumed in large amounts. Soft/carbonated drinks, particularly those with added sugar, provide fluid but comparatively little nutritional benefit, and can contribute excess NMES and empty calories to the diet.

A thorough response concludes that, while a wide variety of fluids can contribute usefully to hydration and can each offer specific nutritional advantages, water itself remains the most straightforward, calorie-free way to meet fluid needs, and the nutritional value of alternative fluids should be weighed against any drawbacks such as added sugar or caffeine content.

Levels of Response (12 marks total, AS1 Section B 4-band grid).

Basic [0]-[3]: Limited response; may mention only water itself or one alternative fluid with little development; weak specialist vocabulary.

Adequate [4]-[6]: Some sources and functions of water described; at least one alternative fluid evaluated with basic detail; underdeveloped overall.

Competent [7]-[9]: Clear description of sources and functions of water; sound evaluation of two or more alternative fluids (e.g. milk, fruit juice, tea/coffee), with both benefits and drawbacks considered; good specialist vocabulary.

Highly competent [10]-[12]: Comprehensive, well-developed discussion of sources and functions of water; thorough, balanced evaluation of multiple alternative fluids with accurate, specific nutritional detail (e.g. NMES in fruit juice, diuretic effect of caffeine); excellent specialist vocabulary; clear, coherent, well-organised response throughout.

A high-scoring answer discusses at least one fat-soluble and one water-soluble vitamin, covering role, deficiency and excess for each.

Vitamin D (fat-soluble): vitamin D promotes the absorption of calcium and phosphorus from the gut, supporting normal bone mineralisation. Deficiency causes rickets in children (soft, bowed bones) and osteomalacia in adults (soft, weakened, painful bones). Because vitamin D is fat-soluble, it can be stored in the body's fat tissue and liver; taken in very large amounts, particularly from high-dose supplements over a long period, excess vitamin D can cause the blood calcium level to become too high (hypercalcaemia), which can lead to symptoms including nausea and, in severe cases, damage to the kidneys through calcium deposits.

Vitamin C (water-soluble): vitamin C acts as an antioxidant and is essential for the synthesis of collagen, needed for healthy skin, blood vessels, gums and wound healing. A severe, prolonged deficiency of vitamin C causes scurvy, a condition characterised by bleeding gums, poor wound healing and, in the past, has historically been strongly associated with sailors on long voyages without fresh fruit or vegetables. Because vitamin C is water-soluble, it is not significantly stored in the body; any excess consumed beyond what the body needs is generally excreted in the urine, meaning the risk of toxicity from dietary or moderate supplemental intake is low, though very high supplemental doses can occasionally cause digestive upset such as diarrhoea.

A thorough response draws a clear contrast: fat-soluble vitamins, because they can be stored in the body, carry a greater risk of toxicity from excessive intake over time (particularly from supplements), whereas water-soluble vitamins are less likely to accumulate to toxic levels because excess is more readily excreted, though this also means they generally need to be consumed more regularly to avoid deficiency.

Levels of Response (12 marks total, AS1 Section B 4-band grid).

Basic [0]-[3]: Discusses only one vitamin, or discusses vitamins with little or no reference to both deficiency and excess; weak specialist vocabulary.

Adequate [4]-[6]: Discusses at least one fat-soluble and one water-soluble vitamin with basic description of role and deficiency; little or no reference to the effects of excess.

Competent [7]-[9]: Clear discussion of at least one fat-soluble and one water-soluble vitamin, covering role, deficiency AND excess with reasonable accuracy and detail; good specialist vocabulary.

Highly competent [10]-[12]: Comprehensive, well-developed discussion of at least one fat-soluble and one water-soluble vitamin, covering role, deficiency and excess in depth with accurate, specific detail; draws a clear, accurate contrast between the storage/toxicity risk of fat-soluble versus water-soluble vitamins; excellent specialist vocabulary; clear, coherent, well-organised response throughout.

(a) True - current UK guidelines recommend adults aim for at least 150 minutes of moderate-intensity activity (or 75 minutes of vigorous-intensity activity) per week. (b) False - the guidelines also recommend that adults carry out muscle-strengthening activities that work all the major muscle groups on at least 2 days a week, in addition to the 150 minutes of moderate-intensity activity.

[1] mark for correctly identifying statement (a) as TRUE. [1] mark for correctly identifying statement (b) as FALSE. Maximum [2].

(a) False - although BMI is a commonly used measure, other methods are also used to assess overweight and obesity, such as waist circumference and waist-to-hip ratio, which give additional information about the pattern of body fat distribution. (b) True - fat stored centrally around the abdomen (sometimes called 'central' or 'android' fat distribution) is associated with a greater risk of conditions such as cardiovascular disease and Type 2 diabetes than fat stored on the hips and thighs ('gynoid' distribution), as central/abdominal fat is more closely linked to insulin resistance and metabolic risk.

[1] mark for correctly identifying statement (a) as FALSE. [1] mark for correctly identifying statement (b) as TRUE. Maximum [2].

Energy balance describes the relationship between the amount of energy an individual consumes through food and drink, and the amount of energy they expend through basal metabolism and physical activity. When energy intake and energy expenditure are equal (energy balance), body weight remains stable over time; a sustained positive energy balance (intake greater than expenditure) leads to weight gain, while a sustained negative energy balance (expenditure greater than intake) leads to weight loss. Factor 1: physical activity level directly affects energy expenditure, as more active individuals, or those who exercise more, expend more energy than sedentary individuals. Factor 2: basal metabolic rate (BMR), the energy needed to maintain the body's basic functions at rest, also affects total energy expenditure; BMR is influenced by factors such as body composition (a higher proportion of lean muscle mass increases BMR, since muscle is more metabolically active than fat), as well as age and sex.

[1]-[2] energy balance correctly explained as the relationship between energy intake and energy expenditure, linked to stable/changing body weight. [1] first valid factor affecting energy expenditure (e.g. physical activity level). [1] second valid factor affecting energy expenditure (e.g. basal metabolic rate/body composition, age, sex). Maximum [4].

A shift towards more sedentary, desk-based employment has reduced the amount of energy people typically expend during their working day compared with more physically active occupations of the past, contributing to a more positive energy balance if food intake does not adjust accordingly. In addition, longer working hours and time spent commuting can reduce the time and energy individuals have available for shopping for and preparing meals from fresh ingredients, increasing reliance on convenience foods, pre-prepared ready meals, and eating out or ordering takeaway food. These convenience options are often higher in energy density, fat, salt and sugar than home-cooked meals made from fresh ingredients, meaning this employment-driven shift in behaviour has contributed to less healthy overall food consumption trends and an increased prevalence of diet-related disorders such as obesity.

[1] correctly identifying reduced energy expenditure from more sedentary work. [1] correctly identifying reduced time for shopping/food preparation due to work patterns. [1] correctly linking this to increased reliance on convenience foods/ready meals/eating out. [1] correctly explaining these foods tend to be higher in energy/fat/salt/sugar. Maximum [4].

Type 2 diabetes is a condition in which the body's cells become resistant to the effects of the hormone insulin (insulin resistance), and/or the pancreas is unable to produce enough insulin to maintain normal blood glucose control, resulting in persistently raised blood glucose levels. Common symptoms include increased thirst, needing to urinate more frequently (particularly at night), increased tiredness/fatigue, and unexplained weight loss. Risk factor 1: obesity is a major risk factor, as excess body fat, particularly around the abdomen, is strongly linked to insulin resistance. Risk factor 2: physical inactivity is also a significant risk factor, since regular muscular activity normally helps maintain the sensitivity of the body's cells to insulin; a sedentary lifestyle reduces this protective effect.

[1] correct definition of Type 2 diabetes (insulin resistance/inadequate insulin production, leading to poor blood glucose control). [1] correct symptom(s) (e.g. increased thirst, frequent urination, fatigue - any one/two for the mark). [1]-[2] first risk factor correctly outlined (e.g. obesity). [1]-[2] second risk factor correctly outlined (e.g. physical inactivity, diet, genetics). Maximum [5].

Body fat: carrying excess body fat, particularly around the abdomen, is associated with an increased risk of several cancers. This is thought to be linked to the fact that fat tissue itself is hormonally active; excess fat tissue is associated with raised levels of certain hormones, including oestrogen and insulin, which can promote the growth and division of cells, potentially contributing to cancer development if this occurs in an uncontrolled way. Physical activity: regular physical activity is associated with a reduced risk of developing certain cancers. This protective effect is thought to work through several mechanisms, including helping to maintain a healthy body weight (reducing the cancer risk associated with excess body fat described above), helping to regulate hormone levels such as insulin and oestrogen, and reducing chronic low-level inflammation within the body, all of which are linked to a reduced risk of cancer development.

Body fat (up to [2]-[3]): [1] excess body fat linked to increased cancer risk + [1]-[2] valid mechanism (e.g. raised oestrogen/insulin promoting cell growth). Physical activity (up to [2]-[3]): [1] regular activity linked to reduced cancer risk + [1]-[2] valid mechanism (e.g. helps maintain healthy weight, regulates hormone levels, reduces inflammation). Maximum [5] overall.

When a pregnant woman consumes alcohol, it passes across the placenta directly to the developing baby. Because the baby's liver is immature and cannot metabolise (break down) alcohol as effectively as an adult's liver, alcohol - and its toxic breakdown product, acetaldehyde - can remain in the baby's system for longer, where it can damage developing cells, tissues and organs, including the developing brain. Alcohol exposure during pregnancy can result in a range of effects, collectively known as fetal alcohol spectrum disorder, which can include restricted growth, characteristic facial abnormalities, and lifelong learning and behavioural difficulties in the child. Justification for complete avoidance: because scientific research has not identified any level of alcohol consumption during pregnancy that can be guaranteed to be completely safe, and because the potential harm to the developing baby (including irreversible, lifelong effects on development) is serious, current guidance recommends that pregnant women avoid alcohol completely throughout pregnancy, as the safest and most cautious approach to protecting the baby's health.

[1] alcohol crosses the placenta to the baby. [1] baby's liver cannot metabolise alcohol as effectively as an adult's. [1]-[2] correct description of potential harm (e.g. fetal alcohol spectrum disorder, growth problems, facial abnormalities, learning/behavioural difficulties). [1]-[2] justified explanation for complete avoidance (e.g. no safe threshold established, risk of serious/irreversible harm). Maximum [6].

Overweight and obesity: carrying excess body weight increases the workload placed on the heart, as it must work harder to pump blood around a larger body mass; excess body fat is also associated with raised blood pressure and an unfavourable blood lipid profile (including raised LDL cholesterol and triglycerides), both of which directly contribute to the development of atherosclerosis (the build-up of fatty deposits within artery walls) that underlies CVD. Hypertension: persistently high blood pressure places excessive mechanical strain on the walls of the arteries; over time, this can damage the delicate inner lining of blood vessels, making them more susceptible to the build-up of fatty plaques, and further increases the risk that an artery will become dangerously narrowed or that a plaque will rupture, leading to a heart attack or stroke. Dietary recommendation: reducing sodium (salt) intake is a well-justified dietary recommendation to help prevent CVD, because a high sodium intake is directly linked to raised blood pressure; by lowering salt intake (for example, by reducing use of table salt and choosing lower-salt processed foods), blood pressure can be reduced, directly lowering the mechanical strain on artery walls and reducing an individual's overall risk of developing CVD.

Overweight/obesity (up to [2]): [1] increases workload on heart/raises blood pressure + [1] negatively affects blood lipid profile, contributing to atherosclerosis. Hypertension (up to [2]): [1] damages/strains artery walls + [1] accelerates atherosclerosis/increases risk of rupture or blockage. Recommendation (up to [3]): [1] valid recommendation named (e.g. reduce sodium/salt intake, increase soluble fibre, reduce saturated fat) + [1]-[2] justified explanation of how it reduces CVD risk. Maximum [7].

A high-scoring answer defines the terms accurately, discusses multiple reasons for rising prevalence, and proposes well-justified recommendations for both children and adults.

Definitions: overweight and obesity refer to an excessive accumulation of body fat that presents a risk to health; they are commonly measured and classified using Body Mass Index (BMI), calculated from a person's weight and height, with additional measures such as waist circumference sometimes used to assess the pattern of fat distribution.

Reasons for rising prevalence: a range of interacting factors have contributed to rising obesity levels in both adults and children, including greater availability and affordability of energy-dense, highly processed foods high in fat and sugar; larger average portion sizes in restaurants, takeaways and packaged foods; more sedentary lifestyles, with more time spent on screen-based activities and less on active transport or outdoor play, particularly among children; and socio-economic barriers, where the cost and accessibility of healthier food options can make a lower-energy, nutrient-dense diet harder to achieve for some households.

Recommendations: to help achieve a healthy weight, individuals should be supported to achieve a sustainable, moderate reduction in energy intake, for example by choosing smaller portions and reducing intake of energy-dense, low-nutrient foods, while increasing intake of fruit, vegetables and fibre-rich foods, which are lower in energy density and help promote fullness/satiety. Alongside dietary change, increasing physical activity levels - in line with current guidelines - helps increase energy expenditure and supports both weight management and broader health. For children specifically, recommendations should focus on establishing healthy family eating patterns and encouraging active play, given the importance of instilling lifelong habits during childhood. Recommendations are strengthened when supported by practical behaviour-change strategies, such as gradual, realistic goal-setting, given that abrupt, extreme dietary restriction is generally difficult to sustain long-term.

A thorough response justifies each recommendation clearly, for example explaining that a moderate rather than extreme energy deficit is more likely to be sustained, supporting lasting weight management rather than short-term, unsustainable weight loss.

Levels of Response (15 marks total, AS2 Section B 4-band grid).

Basic [0]-[3]: Limited definitions; one reason for rising obesity given with little development; recommendations vague or unjustified; weak specialist vocabulary.

Adequate [4]-[7]: Reasonable definitions; some reasons for rising prevalence identified with basic development; some recommendations proposed, but justification is limited.

Competent [8]-[11]: Clear, accurate definitions; several distinct reasons for rising obesity discussed with reasonable development; sound, mostly justified dietary and lifestyle recommendations covering both diet and activity; good specialist vocabulary.

Highly competent [12]-[15]: Comprehensive, accurate definitions; wide range of reasons for rising obesity discussed in depth (dietary, environmental, socio-economic, behavioural); thorough, clearly justified recommendations for both children and adults, covering diet, activity and behaviour change; excellent specialist vocabulary; clear, coherent, well-organised response throughout.

A high-scoring answer discusses a wide range of dietary and lifestyle factors, in each case explaining the mechanism of increased or decreased risk, and proposes justified recommendations addressing multiple factors.

Dietary factors: a high intake of processed and red meat is linked to increased cancer risk, particularly bowel cancer, associated with compounds formed during processing/curing and high-temperature cooking. High salt intake is linked to increased risk of stomach cancer, thought to be related to damage to the stomach lining. In contrast, wholegrain plant foods, fruit and vegetables are protective, providing dietary fibre (which speeds transit time through the bowel, reducing contact time with potentially harmful substances) and antioxidant nutrients (which help protect cells from damage linked to cancer development).

Lifestyle factors: excess body fat is linked to increased cancer risk, partly through raised levels of hormones such as oestrogen and insulin that can promote cell growth. Physical inactivity is linked to increased risk, partly because it is associated with excess body fat and reduced regulation of these hormones. Excessive alcohol consumption increases risk through its toxic breakdown product, acetaldehyde, which can damage cellular DNA. Smoking exposes cells directly to numerous carcinogenic chemicals, strongly linked to lung and other cancers. Excessive sun exposure, particularly resulting in sunburn, damages skin cell DNA and is linked to skin cancer.

Recommendations: to reduce cancer risk, dietary and lifestyle recommendations should include limiting intake of processed and red meat and high-salt foods; increasing intake of fruit, vegetables and wholegrain foods to provide fibre and antioxidants; maintaining a healthy body weight through balanced energy intake and regular physical activity; limiting alcohol consumption within recommended guidelines; avoiding smoking entirely; and using appropriate sun protection (such as sunscreen and appropriate clothing) to reduce UV skin damage.

A thorough response justifies each recommendation by clearly linking it back to the specific mechanism of risk it addresses, demonstrating an integrated understanding of how multiple, interacting diet and lifestyle factors combine to influence overall cancer risk.

Levels of Response (15 marks total, AS2 Section B 4-band grid).

Basic [0]-[3]: One or two factors mentioned with little development; recommendations vague or unjustified; weak specialist vocabulary.

Adequate [4]-[7]: Some dietary AND/OR lifestyle factors identified with basic description; some recommendations proposed but justification limited or one-sided (diet only or lifestyle only).

Competent [8]-[11]: Clear discussion of several dietary factors AND several lifestyle factors, each reasonably explained; sound, mostly justified recommendations addressing multiple factors; good specialist vocabulary.

Highly competent [12]-[15]: Comprehensive, well-developed discussion of a wide range of both dietary and lifestyle factors, each explained with accurate mechanistic detail; thorough, clearly justified recommendations addressing diet, weight, activity, alcohol, smoking and sun exposure; excellent specialist vocabulary; clear, coherent, well-organised response throughout.

A high-scoring answer discusses a range of non-modifiable and modifiable risk factors and proposes recommendations clearly justified against the modifiable factors.

Non-modifiable risk factors are those an individual cannot change: genetics/family history increases risk if close relatives have had CVD; gender means men are generally at higher risk at a younger age than pre-menopausal women, whose risk rises after menopause; age increases risk as arteries naturally stiffen and plaque accumulates over time; and factors such as ethnicity, socio-economic status and low birth weight are also associated with differing baseline CVD risk.

Modifiable risk factors can potentially be changed through lifestyle: smoking damages the lining of blood vessels and accelerates atherosclerosis; reduced physical activity is linked to higher risk through effects on weight, blood pressure and lipid profile; low fruit and vegetable intake reduces protective antioxidant and fibre intake; excessive alcohol intake can raise blood pressure and contribute to weight gain; high blood cholesterol (particularly LDL) directly contributes to plaque formation in artery walls; high sodium intake raises blood pressure; and low soluble fibre intake is linked to less favourable blood cholesterol levels, as soluble fibre helps reduce cholesterol absorption in the gut.

Recommendations: because non-modifiable factors cannot be changed, dietary and lifestyle recommendations should focus on the modifiable factors: stopping smoking, to prevent further damage to blood vessel linings; increasing regular physical activity, to improve blood pressure, lipid profile and help maintain a healthy weight; reducing sodium (salt) intake, to directly help lower blood pressure; increasing intake of soluble fibre (for example from oats and pulses) and fruit and vegetables, to improve blood cholesterol profile and antioxidant intake; and moderating alcohol intake within recommended limits.

A thorough response justifies each recommendation by explaining precisely which modifiable risk factor mechanism it addresses, and recognises that while non-modifiable factors cannot be changed, understanding them helps identify individuals who may benefit most from proactively managing the modifiable factors within their control.

Levels of Response (15 marks total, AS2 Section B 4-band grid).

Basic [0]-[3]: One or two risk factors named with little or no distinction between modifiable/non-modifiable; recommendations vague or unjustified; weak specialist vocabulary.

Adequate [4]-[7]: Some non-modifiable AND some modifiable risk factors identified with basic description; some recommendations proposed, but justification against specific risk factors is limited.

Competent [8]-[11]: Clear discussion of several non-modifiable and several modifiable risk factors, correctly distinguished; sound, mostly justified recommendations addressing the modifiable factors; good specialist vocabulary.

Highly competent [12]-[15]: Comprehensive, well-developed discussion of a wide range of non-modifiable and modifiable risk factors with accurate detail; thorough, clearly justified recommendations, each explicitly linked to the specific modifiable risk factor(s) it addresses; excellent specialist vocabulary; clear, coherent, well-organised response throughout.