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ABCN CNP practice questions

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Question 1Nutrition Science Fundamentals

Which macronutrient provides the most energy per gram when metabolized?

  1. Alcohol
  2. Protein
  3. Carbohydrate
  4. Fat Correct answer.

Explanation

Fat yields about 9 kcal per gram, whereas carbohydrate and protein each yield about 4 kcal per gram. Alcohol yields about 7 kcal per gram, so fat remains the most energy-dense macronutrient.

Question 2Nutrition Science Fundamentals

How many kilocalories are provided by a food item containing 20 g carbohydrate, 10 g protein, and 5 g fat?

  1. 190 kcal
  2. 165 kcal Correct answer.
  3. 245 kcal
  4. 215 kcal

Explanation

Multiply each macronutrient by its energy factor: carbohydrate 20 g × 4 = 80 kcal, protein 10 g × 4 = 40 kcal, and fat 5 g × 9 = 45 kcal. Summing these gives 80 + 40 + 45 = 165 kcal.

Question 3Nutrition Science Fundamentals

Which statement best describes an essential amino acid?

  1. It is only required during periods of rapid growth.
  2. It is stored in adipose tissue for later use.
  3. It must be supplied by the diet because the body cannot make it in sufficient quantity. Correct answer.
  4. It can be synthesized by the body in adequate amounts.

Explanation

Essential amino acids cannot be synthesized by the body in amounts sufficient to meet metabolic needs, so they must come from food. Nonessential amino acids, by contrast, can be produced endogenously.

Question 4Nutrition Science Fundamentals

A vegan client wants to meet protein needs by combining plant foods. Which pairing best illustrates complementary proteins?

  1. Honey and almonds
  2. Rice and beans Correct answer.
  3. Olive oil and lentils
  4. Butter and white bread

Explanation

Complementary proteins pair a food limiting in lysine with one limiting in methionine, so together they supply a fuller amino acid profile. Rice is low in lysine while beans are low in methionine, making the combination complementary.

Question 5Nutrition Science Fundamentals

Which enzyme begins the digestion of dietary starch in the mouth?

  1. Trypsin
  2. Salivary amylase Correct answer.
  3. Lipase
  4. Pepsin

Explanation

Salivary amylase (ptyalin) starts hydrolyzing starch into shorter polysaccharides and maltose in the mouth. Its action stops in the acidic stomach but resumes in the small intestine via pancreatic amylase.

Question 6Nutrition Science Fundamentals

Where does the majority of nutrient absorption occur?

  1. Stomach
  2. Large intestine
  3. Esophagus
  4. Small intestine Correct answer.

Explanation

The small intestine, with its villi and microvilli, provides the vast surface area where most macronutrients, vitamins, and minerals are absorbed. The large intestine mainly absorbs water and electrolytes.

Question 7Nutrition Science Fundamentals

Which transport mechanism allows glucose to enter intestinal cells against its concentration gradient?

  1. Simple diffusion
  2. Sodium-dependent active transport Correct answer.
  3. Facilitated diffusion
  4. Osmosis

Explanation

Glucose uptake at the enterocyte brush border uses the sodium-glucose linked transporter, which harnesses the sodium gradient maintained by the sodium-potassium pump. This is a form of secondary active transport that moves glucose against its gradient.

Question 8Nutrition Science Fundamentals

Which lipid fraction is most strongly associated with increased cardiovascular risk when elevated?

  1. Low-density lipoprotein cholesterol Correct answer.
  2. Triglyceride-rich chylomicrons in the fed state
  3. High-density lipoprotein cholesterol
  4. Free fatty acids bound to albumin

Explanation

Elevated low-density lipoprotein cholesterol is a well-established causal factor in atherosclerotic cardiovascular disease. High-density lipoprotein is generally considered protective at typical concentrations.

Question 9Nutrition Science Fundamentals

Which fatty acid is classified as an omega-3 fatty acid?

  1. Arachidonic acid
  2. Oleic acid
  3. Linoleic acid
  4. Alpha-linolenic acid Correct answer.

Explanation

Omega-3 fatty acids have their first double bond three carbons from the methyl end; alpha-linolenic acid is the essential plant-derived omega-3. Linoleic and arachidonic acids are omega-6, and oleic acid is omega-9.

Question 10Nutrition Science Fundamentals

Which vitamin is synthesized in the skin upon exposure to ultraviolet B radiation?

  1. Vitamin A
  2. Vitamin C
  3. Vitamin K
  4. Vitamin D Correct answer.

Explanation

Ultraviolet B light converts 7-dehydrocholesterol in the skin to previtamin D3, which isomerizes to vitamin D3. This endogenous synthesis is a major source of vitamin D for many people.

Question 11Nutrition Science Fundamentals

Which vitamin functions as a coenzyme in carboxylation reactions, including the activation of clotting factors II, VII, IX, and X?

  1. Thiamin
  2. Folate
  3. Vitamin K Correct answer.
  4. Vitamin B12

Explanation

Vitamin K is the cofactor for gamma-carboxylation of glutamate residues in several clotting factors, enabling them to bind calcium. Without it, these factors remain functionally inactive.

Question 12Nutrition Science Fundamentals

Which mineral is the primary structural component of hydroxyapatite in bone?

  1. Zinc
  2. Iron
  3. Calcium Correct answer.
  4. Selenium

Explanation

Calcium combines with phosphate to form hydroxyapatite crystals, the main mineral matrix of bone and teeth. About 99% of body calcium resides in bone.

Question 13Nutrition Science Fundamentals

Which condition results from prolonged iodine deficiency?

  1. Scurvy
  2. Pellagra
  3. Goiter Correct answer.
  4. Beriberi

Explanation

Iodine is required to synthesize thyroid hormones; deficiency leads to reduced hormone output and thyroid enlargement known as goiter. Severe deficiency during pregnancy can also impair fetal neurodevelopment.

Question 14Nutrition Science Fundamentals

Which statement accurately describes the role of dietary fiber in glycemic control?

  1. Fiber has no effect on postprandial glucose.
  2. Fiber raises postprandial glucose by delaying gastric emptying.
  3. Insoluble fiber directly lowers blood glucose by stimulating insulin release.
  4. Soluble fiber slows gastric emptying and glucose absorption. Correct answer.

Explanation

Soluble fiber forms a gel that slows gastric emptying and the rate of glucose absorption, blunting postprandial glucose excursions. Insoluble fiber mainly adds bulk and speeds transit.

Question 15Nutrition Science Fundamentals

Which term describes the amount of a nutrient that meets the requirement of 50% of a healthy population group?

  1. Adequate Intake
  2. Tolerable Upper Intake Level
  3. Recommended Dietary Allowance
  4. Estimated Average Requirement Correct answer.

Explanation

The Estimated Average Requirement is the intake level estimated to meet the needs of half the individuals in a group. The Recommended Dietary Allowance is set higher, covering about 97-98% of the group.

Question 16Nutrition Science Fundamentals

A dietary assessment method asks a client to record everything eaten over three consecutive days, including one weekend day. What is the primary advantage of this approach?

  1. It records foods at the time of consumption, reducing reliance on memory. Correct answer.
  2. It requires no training for the client.
  3. It eliminates recall bias entirely.
  4. It captures usual intake without any measurement error.

Explanation

Prospective food records are completed as foods are eaten, which reduces recall error compared with retrospective methods. However, they still carry underreporting and reactivity bias, so they do not eliminate measurement error.

Question 17Nutrition Science Fundamentals

Which factor most increases a person's resting energy expenditure per unit of body mass?

  1. Lower physical activity level
  2. Higher proportion of adipose tissue
  3. Increased age
  4. Higher proportion of lean body mass Correct answer.

Explanation

Lean tissue is metabolically active and burns more energy at rest than fat tissue, so a higher lean mass raises resting energy expenditure per kilogram. Adipose tissue is comparatively less metabolically active.

Question 18Nutrition Science Fundamentals

Which component contributes the largest share of total daily energy expenditure in most sedentary adults?

  1. Thermic effect of food
  2. Physical activity
  3. Adaptive thermogenesis
  4. Resting metabolic rate Correct answer.

Explanation

Resting metabolic rate accounts for roughly 60-75% of total energy expenditure in most adults. Physical activity is the most variable component but usually smaller in sedentary individuals.

Question 19Nutrition Science Fundamentals

Which hormone is released by adipose tissue and signals satiety to the hypothalamus?

  1. Ghrelin
  2. Glucagon
  3. Insulin
  4. Leptin Correct answer.

Explanation

Leptin is secreted by adipocytes in proportion to fat stores and acts on hypothalamic receptors to reduce appetite. Ghrelin, in contrast, is a gastric hormone that stimulates hunger.

Question 20Nutrition Science Fundamentals

Which dietary pattern is most consistent with a reduced risk of hypertension according to the DASH approach?

  1. High in sodium and low in potassium
  2. Rich in fruits, vegetables, and low-fat dairy with reduced sodium Correct answer.
  3. High in saturated fat and refined grains
  4. Very low in total carbohydrate and high in sodium

Explanation

The DASH pattern emphasizes fruits, vegetables, whole grains, and low-fat dairy while limiting sodium, which together lower blood pressure. Potassium-rich produce counterbalances sodium's pressor effect.

Question 21Nutrition Science Fundamentals

Which statement about glycemic index is accurate?

  1. It is identical to glycemic load for all foods.
  2. It measures total carbohydrate content per serving.
  3. It reflects the insulin content of a food.
  4. It ranks foods by their blood glucose response relative to a reference food. Correct answer.

Explanation

Glycemic index compares the blood glucose response to a fixed amount of available carbohydrate from a test food against a reference food such as glucose. Glycemic load adjusts this value for the actual carbohydrate quantity in a serving.

Question 22Nutrition Science Fundamentals

Which nutrient is most likely to be inadequate in a strict plant-based diet unless fortified foods or supplements are used?

  1. Vitamin B12 Correct answer.
  2. Fiber
  3. Potassium
  4. Vitamin C

Explanation

Vitamin B12 occurs naturally almost exclusively in animal-derived foods, so strict plant-based diets require fortified foods or supplements. Plant foods are typically rich in vitamin C, potassium, and fiber.

Question 23Nutrition Science Fundamentals

A client reports consuming 2,000 kcal daily with 300 g of carbohydrate. What percentage of total energy comes from carbohydrate?

  1. 55%
  2. 45%
  3. 75%
  4. 60% Correct answer.

Explanation

Carbohydrate provides 300 g × 4 kcal = 1,200 kcal. Dividing 1,200 by 2,000 kcal and multiplying by 100 gives 60% of total energy.

Question 24Nutrition Science Fundamentals

Which mechanism best explains how dietary calcium absorption is enhanced?

  1. Low gastric acidity
  2. Binding to phytates in the gut
  3. High intake of oxalate-rich foods
  4. Presence of vitamin D in its active form Correct answer.

Explanation

Calcitriol, the active form of vitamin D, increases intestinal synthesis of calcium-binding proteins that facilitate absorption. Phytates and oxalates instead bind calcium and reduce its bioavailability.

Question 25Nutrition Science Fundamentals

Which statement correctly distinguishes between undernutrition and overnutrition?

  1. Undernutrition excludes deficiencies of single nutrients.
  2. Overnutrition can coexist with micronutrient deficiencies. Correct answer.
  3. Overnutrition always results in adequate micronutrient status.
  4. Undernutrition refers only to insufficient calorie intake.

Explanation

Overnutrition, or excess energy intake leading to overweight, can occur alongside inadequate intake of vitamins and minerals, a situation sometimes called hidden hunger. Undernutrition also encompasses deficiencies of specific nutrients, not just calories.

Question 26Nutrition Science Fundamentals

Which enzyme begins the chemical digestion of starch in the mouth and small intestine?

  1. Trypsin
  2. Lipase
  3. Amylase Correct answer.
  4. Pepsin

Explanation

Amylase hydrolyzes the alpha-1,4 glycosidic bonds of starch, producing shorter polysaccharides and maltose. Salivary amylase starts this in the mouth, and pancreatic amylase continues it in the small intestine lumen.

Question 27Nutrition Science Fundamentals

Which substance is the primary emulsifier of dietary fat in the small intestine?

  1. Pepsinogen
  2. Intrinsic factor
  3. Bile salts Correct answer.
  4. Hydrochloric acid

Explanation

Bile salts are amphipathic molecules secreted by the liver and stored in the gallbladder; they surround fat droplets and emulsify them into micelles, greatly increasing the surface area for lipase action.

Question 28Nutrition Science Fundamentals

Which amino acids are classified as essential because the body cannot synthesize them in adequate amounts?

  1. Proline, cysteine, arginine
  2. Alanine, aspartate, glutamate
  3. Leucine, lysine, methionine Correct answer.
  4. Glycine, serine, tyrosine

Explanation

Essential amino acids must be supplied by diet because endogenous synthesis cannot meet needs. Leucine, lysine, and methionine are among the nine essential amino acids.

Question 29Nutrition Science Fundamentals

Which vitamin is water-soluble and functions as a precursor of the coenzyme NAD and NADP?

  1. Niacin (B3) Correct answer.
  2. Thiamin (B1)
  3. Pyridoxine (B6)
  4. Riboflavin (B2)

Explanation

Niacin is converted to nicotinamide adenine dinucleotide (NAD) and NAD phosphate (NADP), which are central electron carriers in oxidation-reduction reactions.

Question 30Nutrition Science Fundamentals

A client consumes 75 g of protein daily and weighs 60 kg. What is the approximate protein intake per kilogram of body weight?

  1. 1.5 g/kg
  2. 1.25 g/kg Correct answer.
  3. 2.0 g/kg
  4. 0.8 g/kg

Explanation

Divide total protein intake by body weight: 75 g ÷ 60 kg = 1.25 g/kg. This exceeds the RDA of 0.8 g/kg for healthy adults.

Question 31Nutrition Science Fundamentals

Which change in dietary intake is most appropriate to reduce LDL cholesterol in a client with elevated levels?

  1. Eliminating all dietary cholesterol
  2. Increasing trans fat intake
  3. Replacing saturated fat with unsaturated fats Correct answer.
  4. Increasing saturated fat to 15% of energy

Explanation

Substituting unsaturated fats for saturated fats lowers LDL cholesterol, as saturated and trans fats raise it. Dietary cholesterol has a smaller effect than fat quality.

Question 32Nutrition Science Fundamentals

Which statement best describes the difference between a nutrient requirement and a dietary reference intake?

  1. A requirement is an individual's minimum need, while a reference intake is a population-level value used for assessment and planning Correct answer.
  2. A requirement is always higher than a reference intake
  3. A requirement applies only to deficient individuals, while a reference intake applies to all people
  4. A requirement is set by food manufacturers, while a reference intake is set by clinicians

Explanation

An individual requirement is the amount needed to prevent deficiency and maintain health in that person. Dietary reference intakes are population-level benchmarks derived from requirements and used for planning and assessing diets.

Question 33Nutrition Science Fundamentals

Which factor most directly increases non-exercise activity thermogenesis (NEAT) in a sedentary office worker?

  1. Eating a high-protein lunch
  2. Sleeping eight hours per night
  3. Standing and walking during work breaks Correct answer.
  4. Reducing caffeine intake

Explanation

NEAT includes energy expended in spontaneous physical activity such as standing, fidgeting, and walking. Increasing these low-intensity movements raises daily energy expenditure without structured exercise.

Question 34Nutrition Science Fundamentals

Which laboratory marker is most specific for assessing long-term glycemic control over the previous two to three months?

  1. Random capillary glucose
  2. Urine ketones
  3. Fasting plasma glucose
  4. Glycated hemoglobin (HbA1c) Correct answer.

Explanation

HbA1c reflects the fraction of hemoglobin that has been glycated over the lifespan of red blood cells, roughly two to three months. Fasting and random glucose values reflect only the moment of sampling.

Question 35Nutrition Science Fundamentals

Which statement accurately describes the role of phytates in mineral bioavailability?

  1. Phytates increase vitamin C absorption
  2. Phytates are a source of essential amino acids
  3. Phytates bind minerals such as iron and zinc and reduce their absorption Correct answer.
  4. Phytates enhance absorption of calcium and iron

Explanation

Phytic acid, found in whole grains and legumes, chelates minerals such as iron, zinc, and calcium, forming insoluble complexes that reduce absorption. Processing methods like soaking and fermentation can reduce phytate content.

Question 36Nutrition Science Fundamentals

Which dietary component most strongly promotes increased iron absorption when consumed with a plant-based meal?

  1. Phytates
  2. Vitamin C Correct answer.
  3. Tannins from tea
  4. Calcium

Explanation

Vitamin C reduces nonheme iron to the more absorbable ferrous form and forms soluble complexes with iron, enhancing absorption. Tannins, calcium, and phytates all inhibit nonheme iron absorption.

Question 37Nutrition Science Fundamentals

Which change in body composition best explains the decline in resting energy expenditure often seen with aging?

  1. An increase in physical activity
  2. An increase in fat-free mass
  3. A loss of fat-free mass and increase in fat mass Correct answer.
  4. A decrease in dietary protein intake

Explanation

Fat-free mass is the most metabolically active tissue and is a principal determinant of resting energy expenditure. Aging is associated with loss of lean mass and a relative increase in fat mass, lowering resting expenditure.

Question 38Nutrition Science Fundamentals

A client's 24-hour diet recall shows 60 g of fat, 250 g of carbohydrate, and 100 g of protein. What is the approximate percentage of energy from fat?

  1. 27% Correct answer.
  2. 55%
  3. 12%
  4. 40%

Explanation

Fat provides 9 kcal/g, carbohydrate 4 kcal/g, and protein 4 kcal/g. Fat contributes 540 kcal; total energy is 540 + 1,000 + 400 = 1,940 kcal, so fat is about 27.8% of energy.

Question 39Nutrition Science Fundamentals

Which mechanism best explains why a high-fiber meal can reduce postprandial blood glucose excursions?

  1. Soluble fiber forms a viscous gel that slows glucose absorption Correct answer.
  2. Fiber increases gastric emptying rate
  3. Fiber is converted to glucose in the stomach
  4. Fiber stimulates insulin secretion directly

Explanation

Soluble fibers such as beta-glucan and pectin form viscous gels that slow gastric emptying and the diffusion of glucose to the intestinal brush border. This blunts the postprandial glucose rise.

Question 40Nutrition Science Fundamentals

Which pair of vitamins is most susceptible to loss through leaching into cooking water because both are water-soluble?

  1. Vitamin E and vitamin K
  2. Vitamin A and vitamin D
  3. Vitamin C and folate Correct answer.
  4. Vitamin K and vitamin A

Explanation

Water-soluble vitamins dissolve in cooking water and can be lost through leaching, especially with prolonged boiling. Vitamin C and folate are particularly heat- and water-labile.

Question 41Assessment and Nutritional Diagnosis

Which biochemical marker is the most specific indicator of recent dietary intake of simple sugars?

  1. Glycated hemoglobin (HbA1c)
  2. Serum insulin
  3. Fasting plasma glucose
  4. Serum fructosamine Correct answer.

Explanation

Fructosamine reflects glycated serum proteins over roughly the prior two to three weeks, making it more sensitive to recent dietary sugar changes than longer-term markers. HbA1c integrates about three months of glycemia, and single fasting values capture only a moment in time.

Question 42Assessment and Nutritional Diagnosis

A 24-hour dietary recall is best described by which characteristic?

  1. It relies on memory and may miss episodically consumed foods Correct answer.
  2. It eliminates underreporting of portion sizes
  3. It captures usual intake over a full season
  4. It quantifies intake without requiring respondent memory

Explanation

The 24-hour recall depends on the respondent's memory of the previous day and can miss foods eaten irregularly. Because it covers only one day, it does not represent usual intake unless repeated on multiple days.

Question 43Assessment and Nutritional Diagnosis

Which anthropometric index is used to classify a child's weight status relative to height and age?

  1. Triceps skinfold z-score
  2. Body mass index for age percentile Correct answer.
  3. Waist-to-height ratio
  4. Mid-upper arm circumference

Explanation

BMI-for-age percentile is the standard pediatric index for classifying weight status because it accounts for growth and maturation. Other measures assess fat distribution or fat stores but are not the primary classification tool.

Question 44Assessment and Nutritional Diagnosis

Which laboratory finding most directly supports a diagnosis of iron deficiency anemia?

  1. Normal ferritin with elevated transferrin saturation
  2. Low serum ferritin with low mean corpuscular volume Correct answer.
  3. Elevated serum ferritin with high MCV
  4. Elevated total iron-binding capacity with high ferritin

Explanation

Iron deficiency depletes stores, lowering ferritin, and impairs hemoglobin synthesis, producing microcytosis (low MCV). Together these findings strongly support the diagnosis.

Question 45Assessment and Nutritional Diagnosis

In the nutrition care process, the assessment step primarily serves which purpose?

  1. Selecting the intervention goals for the client
  2. Documenting the discharge plan
  3. Monitoring whether the intervention was effective
  4. Obtaining and interpreting data to identify nutrition-related problems Correct answer.

Explanation

Assessment gathers and interprets relevant data to identify nutrition-related problems and their causes. Intervention, monitoring, and evaluation are subsequent steps that build on that assessment.

Question 46Assessment and Nutritional Diagnosis

Which food-frequency questionnaire design feature most improves its ability to rank individuals by usual intake?

  1. Specifying a defined reference period and standard portion sizes Correct answer.
  2. Administering it once immediately after a holiday
  3. Recording intake only on weekends
  4. Using a single open-ended question about all foods

Explanation

A defined reference period with standard portion sizes reduces ambiguity and supports ranking of usual intake. Open-ended or unrepresentative single administrations introduce error and bias.

Question 47Assessment and Nutritional Diagnosis

Which measurement best estimates visceral adiposity in a clinical setting?

  1. Body mass index
  2. Head circumference
  3. Waist circumference Correct answer.
  4. Calf circumference

Explanation

Waist circumference reflects abdominal fat distribution and correlates with visceral adiposity. BMI reflects overall weight-for-height without indicating fat distribution.

Question 48Assessment and Nutritional Diagnosis

A patient's estimated energy requirement is being set using the Mifflin-St Jeor equation. Which input is required?

  1. Age, sex, and waist circumference
  2. Weight, height, and skinfold thickness
  3. Height, activity factor, and body fat percentage
  4. Weight, height, age, and sex Correct answer.

Explanation

The Mifflin-St Jeor equation uses weight, height, age, and sex to estimate resting energy expenditure. Activity factors are applied afterward to estimate total needs.

Question 49Assessment and Nutritional Diagnosis

A client reports drinking two 12-oz cans of regular soda daily. How many fluid ounces of sugar-sweetened beverage does this represent per week?

  1. 24 oz
  2. 84 oz
  3. 336 oz
  4. 168 oz Correct answer.

Explanation

Two 12-oz cans equal 24 oz per day; multiplying by 7 days gives 168 oz per week. Careful unit tracking prevents over- or under-estimating intake.

Question 50Assessment and Nutritional Diagnosis

A 70-year-old with chronic kidney disease has a serum albumin of 3.0 g/dL. Which interpretation is most appropriate?

  1. Albumin is the most sensitive marker of recent protein intake
  2. A normal albumin rules out malnutrition
  3. A low albumin confirms protein-energy malnutrition
  4. Albumin is influenced by inflammation and may not reflect nutritional status alone Correct answer.

Explanation

Albumin behaves as a negative acute-phase reactant, so inflammation and illness lower it independently of nutrition. It should be interpreted alongside clinical context rather than as a standalone malnutrition marker.