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NASM CSNC practice questions

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Question 1Nutrition Science Foundations

Which macronutrient provides the most energy per gram and is the primary fuel stored in adipose tissue?

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

Explanation

Fat yields roughly 9 kcal per gram, while carbohydrate and protein each yield about 4 kcal per gram and alcohol about 7 kcal per gram. Adipose tissue stores energy overwhelmingly as triglyceride, making fat the body's densest and most abundant fuel reserve.

Question 2Nutrition Science Foundations

A client wants to know the caloric value of a food label listing 20 g carbohydrate, 10 g protein, and 5 g fat. What is the approximate total energy content?

  1. 205 kcal
  2. 185 kcal
  3. 245 kcal
  4. 165 kcal Correct answer.

Explanation

Multiply each macronutrient by its Atwater factor: carbohydrate 20 g x 4 = 80 kcal, protein 10 g x 4 = 40 kcal, and fat 5 g x 9 = 45 kcal. Summing these gives 165 kcal for the stated serving.

Question 3Nutrition Science Foundations

In the digestive process, where does the majority of chemical digestion and nutrient absorption occur?

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

Explanation

The small intestine, aided by pancreatic enzymes and bile, completes most enzymatic breakdown and absorbs the bulk of macronutrients and micronutrients through its villi and microvilli. The stomach mainly churns and initiates protein digestion, while the large intestine absorbs water and electrolytes.

Question 4Nutrition Science Foundations

Which statement correctly describes the role of insulin in macronutrient metabolism?

  1. Insulin facilitates glucose uptake and stimulates glycogen synthesis Correct answer.
  2. Insulin promotes glycogenolysis and lipolysis
  3. Insulin increases hepatic glucose output after a meal
  4. Insulin stimulates gluconeogenesis in the liver

Explanation

Insulin is released by pancreatic beta cells in response to rising blood glucose and promotes cellular glucose uptake, glycogen synthesis, lipogenesis, and protein synthesis. It is an anabolic hormone that lowers circulating glucose.

Question 5Nutrition Science Foundations

How many kilocalories does one gram of dietary fiber provide under standard Atwater conventions used on nutrition labels?

  1. 4 kcal
  2. 0 kcal
  3. 9 kcal
  4. 2 kcal Correct answer.

Explanation

Under the standard labeling convention, fiber is assigned about 2 kcal per gram because it is largely fermented rather than fully absorbed. This value is used in the United States for label calculations, though actual energy yield from fermentation varies.

Question 6Nutrition Science Foundations

Which vitamin is water-soluble and functions as a coenzyme in energy metabolism and collagen synthesis?

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

Explanation

Vitamin C (ascorbic acid) is water-soluble and serves as a cofactor for hydroxylation reactions in collagen synthesis and as an antioxidant. It also supports carnitine and catecholamine synthesis.

Question 7Nutrition Science Foundations

Which mineral is the primary extracellular cation and plays a central role in fluid balance and nerve conduction?

  1. Sodium Correct answer.
  2. Magnesium
  3. Potassium
  4. Calcium

Explanation

Sodium is the predominant cation in extracellular fluid and drives osmotic balance and action potentials. Potassium is the main intracellular cation, while calcium and magnesium are largely intracellular or structural.

Question 8Nutrition Science Foundations

A nutrition coach is documenting the Acceptable Macronutrient Distribution Range (AMDR) for adults. Which range applies to dietary fat?

  1. 45-65% of total energy
  2. 10-35% of total energy
  3. 5-10% of total energy
  4. 20-35% of total energy Correct answer.

Explanation

The AMDR for fat in adults is approximately 20-35% of total energy intake, reflecting the need for essential fatty acids and fat-soluble vitamin absorption while limiting excess saturated fat. The other ranges correspond to carbohydrate and protein.

Question 9Nutrition Science Foundations

During a steady-state run, a client asks which fuel source becomes increasingly dominant as exercise duration extends beyond 60 minutes.

  1. Phosphocreatine
  2. Muscle glycogen
  3. Fat oxidation Correct answer.
  4. Dietary protein

Explanation

As glycogen stores deplete during prolonged moderate-intensity exercise, the body increasingly relies on fat oxidation for ATP production. Glycogen remains important early, but the relative fat contribution rises with duration.

Question 10Nutrition Science Foundations

Which statement best describes the concept of nutrient timing for a client performing resistance training?

  1. Consuming protein and carbohydrate around training can support recovery and glycogen resynthesis Correct answer.
  2. Protein should be avoided before resistance training to prevent muscle breakdown
  3. Nutrient timing is irrelevant as long as total daily calories are met
  4. Carbohydrate intake should be restricted entirely on training days

Explanation

Post-exercise protein and carbohydrate intake can enhance muscle protein synthesis and replenish glycogen, particularly when training is frequent or intense. Total daily intake remains the primary driver, but timing can support recovery goals.

Question 11Nutrition Science Foundations

A client reports consuming a high-protein diet and wants to know the upper end of the AMDR for protein as a percentage of total energy.

  1. 25%
  2. 10%
  3. 45%
  4. 35% Correct answer.

Explanation

The AMDR for protein in adults ranges from 10% to 35% of total energy. Intakes above this range are not generally recommended without individualized justification and medical oversight.

Question 12Nutrition Science Foundations

Which dietary factor most directly increases the absorption of non-heme iron from plant foods?

  1. Phytic acid
  2. Tannins
  3. Vitamin C Correct answer.
  4. Calcium

Explanation

Vitamin C reduces ferric iron to the more absorbable ferrous form and forms a soluble complex that enhances non-heme iron uptake. Calcium, phytates, and tannins inhibit iron absorption.

Question 13Nutrition Science Foundations

What is the primary role of the enzyme amylase in digestion?

  1. Breaking down nucleic acids into nucleotides
  2. Breaking down triglycerides into fatty acids
  3. Breaking down proteins into amino acids
  4. Breaking down starches into smaller polysaccharides and sugars Correct answer.

Explanation

Amylase, present in saliva and pancreatic juice, hydrolyzes alpha-1,4 glycosidic bonds in starch to produce dextrins and maltose. Lipases, proteases, and nucleases handle the other substrates.

Question 14Nutrition Science Foundations

A client with a demanding training schedule wants to know the recommended daily protein intake for building muscle, expressed per kilogram of body weight.

  1. 3.5-4.0 g/kg
  2. 0.8-1.0 g/kg
  3. 1.4-2.0 g/kg Correct answer.
  4. 0.4-0.6 g/kg

Explanation

Evidence supports approximately 1.4-2.0 g of protein per kilogram of body weight per day for individuals engaged in resistance training to support muscle protein synthesis. The RDA of 0.8 g/kg is a minimum for sedentary adults.

Question 15Nutrition Science Foundations

Which statement accurately describes the difference between saturated and unsaturated fatty acids?

  1. Unsaturated fatty acids have no double bonds in the carbon chain
  2. Saturated fatty acids have no double bonds and are generally solid at room temperature Correct answer.
  3. Unsaturated fatty acids are always solid at room temperature
  4. Saturated fatty acids contain one or more double bonds between carbons

Explanation

Saturated fatty acids lack double bonds, packing tightly and tending to be solid at room temperature. Unsaturated fatty acids contain one or more double bonds that create kinks and are generally liquid at room temperature.

Question 16Nutrition Science Foundations

A client following a vegan diet is at risk for vitamin B12 deficiency. Which explanation best describes why?

  1. Vitamin B12 is destroyed by cooking plant foods
  2. Vitamin B12 is only synthesized during exercise
  3. Vitamin B12 absorption requires dietary fat
  4. Vitamin B12 is found primarily in animal-derived foods Correct answer.

Explanation

Vitamin B12 occurs naturally almost exclusively in animal-derived foods, so vegans require fortified foods or supplements. Absorption depends on intrinsic factor and gastric acid, not dietary fat.

Question 17Nutrition Science Foundations

Which of the following best explains the thermic effect of food (TEF)?

  1. Energy expended during structured exercise
  2. Energy stored as fat after a meal
  3. Energy used to digest, absorb, and metabolize nutrients Correct answer.
  4. Energy burned at rest to maintain basic body functions

Explanation

The thermic effect of food refers to the energy cost of digesting, absorbing, and metabolizing nutrients, typically about 10% of total energy expenditure. Protein has the highest TEF among macronutrients.

Question 18Nutrition Science Foundations

A client wants to increase dietary fiber intake. Which recommendation is most consistent with current guidelines for adults?

  1. Consume 14 g of fiber per 1,000 kcal consumed Correct answer.
  2. Consume fiber only from supplements
  3. Consume 5-10 g of fiber daily
  4. Consume 50 g of fiber daily regardless of energy intake

Explanation

Dietary guidelines recommend about 14 g of fiber per 1,000 kcal, which for a 2,000 kcal diet equals roughly 28 g per day. This approach scales fiber needs to energy intake and emphasizes food sources.

Question 19Nutrition Science Foundations

Which statement about the glycemic index (GI) is most accurate?

  1. GI measures the insulin response to a meal
  2. GI ranks foods by their total carbohydrate content
  3. GI ranks foods by how quickly they raise blood glucose relative to a reference food Correct answer.
  4. GI is identical for every individual regardless of food preparation

Explanation

The glycemic index ranks carbohydrate-containing foods by their postprandial blood glucose response relative to a reference food such as glucose or white bread. It is distinct from total carbohydrate content and is influenced by processing and preparation.

Question 20Nutrition Science Foundations

A client asks about the health effects of trans fatty acids. Which statement is most accurate?

  1. Industrial trans fats raise LDL cholesterol and lower HDL cholesterol Correct answer.
  2. Trans fats are found only in animal products
  3. Trans fats are essential fatty acids required in the diet
  4. Trans fats have no effect on cardiovascular risk

Explanation

Industrial trans fatty acids adversely affect the lipid profile by raising LDL cholesterol and lowering HDL cholesterol, which increases cardiovascular risk. They are not essential and are best minimized in the diet.

Question 21Nutrition Science Foundations

A client training for a marathon wants to maximize glycogen stores before race day. Which strategy is most appropriate?

  1. Severe carbohydrate restriction for one week before the race
  2. Increasing training volume while keeping carbohydrate intake low
  3. Eliminating all fat and protein in the final week
  4. Gradual increase in carbohydrate intake while tapering training in the days before the race Correct answer.

Explanation

Carbohydrate loading is best achieved by tapering training while increasing carbohydrate intake in the days before competition, which maximizes muscle glycogen stores. Severe restriction or continued high-volume training would impair glycogen storage.

Question 22Nutrition Science Foundations

Which mechanism best explains why high dietary protein intake can increase urinary calcium excretion?

  1. Protein reduces vitamin D synthesis in the skin
  2. Protein metabolism increases acid load, prompting bone buffering and calcium loss Correct answer.
  3. Protein binds calcium in the gut and prevents absorption
  4. Protein directly inhibits parathyroid hormone

Explanation

High protein intake, particularly from animal sources, can increase the acid load, and the body may buffer this partly through bone mineral release, raising urinary calcium. This effect is generally offset by adequate calcium intake and is not a primary cause of bone loss.

Question 23Nutrition Science Foundations

A client with iron-deficiency anemia is advised to take an iron supplement. Which practice best improves absorption?

  1. Taking the supplement with a calcium-rich meal
  2. Taking the supplement with a vitamin C-rich beverage Correct answer.
  3. Taking the supplement with high-fiber cereal
  4. Taking the supplement with coffee

Explanation

Vitamin C enhances non-heme iron absorption by reducing iron to the ferrous form and forming a soluble complex. Coffee, calcium, and high-fiber foods contain inhibitors that reduce absorption.

Question 24Nutrition Science Foundations

Which statement best describes the relationship between energy balance and body weight change?

  1. A sustained energy deficit leads to weight loss, while a sustained surplus leads to weight gain Correct answer.
  2. Protein intake alone determines weight change
  3. Weight change depends solely on carbohydrate intake
  4. Weight change is unrelated to total energy intake

Explanation

Body weight change is fundamentally governed by energy balance: a sustained deficit promotes weight loss and a sustained surplus promotes weight gain, though individual factors modulate the response. Macronutrient composition influences satiety and body composition but does not override energy balance.

Question 25Nutrition Science Foundations

A client following a ketogenic diet reports fatigue and headache during the first week. Which explanation is most physiologically plausible?

  1. The diet is increasing insulin secretion
  2. The diet is causing an immediate increase in blood glucose
  3. Excessive dietary protein is causing muscle catabolism
  4. Rapid glycogen depletion and increased sodium and water excretion are occurring Correct answer.

Explanation

Early in a very-low-carbohydrate diet, glycogen depletion and reduced insulin promote natriuresis and water loss, which can cause fatigue, headache, and electrolyte imbalances. Adequate hydration and electrolytes often mitigate these symptoms.

Question 26Nutrition Science Foundations

Which statement best describes the role of the small intestine in the digestion of dietary carbohydrates?

  1. It stores glycogen granules that are later released into the bloodstream between meals.
  2. It ferments all remaining starch into short-chain fatty acids before any absorption occurs.
  3. It absorbs intact disaccharides directly into the portal vein without further breakdown.
  4. It releases pancreatic amylase and brush-border enzymes that reduce starches to monosaccharides for absorption. Correct answer.

Explanation

Pancreatic amylase and brush-border disaccharidases (maltase, sucrase, lactase) act in the small intestine to convert starches and sugars into absorbable monosaccharides. Absorption of glucose and galactose occurs via SGLT1 and fructose via GLUT5 across the enterocyte.

Question 27Nutrition Science Foundations

Which nutrient is classified as a fat-soluble vitamin that functions in blood clotting and bone metabolism?

  1. Vitamin C
  2. Vitamin B6
  3. Vitamin K Correct answer.
  4. Folate

Explanation

Vitamin K is a fat-soluble vitamin required for the gamma-carboxylation of clotting factors and osteocalcin, linking it to both coagulation and bone health. Vitamins A, D, E, and K share the fat-soluble characteristic of requiring bile and micelle formation for absorption.

Question 28Nutrition Science Foundations

A client asks how much of their total daily fluid intake should come from beverages versus food. Which statement is most consistent with general hydration guidance for healthy adults?

  1. Food contributes about 60% of total water intake, so beverages are a minor source.
  2. Fluid needs can only be met by sports drinks containing electrolytes.
  3. Nearly all water intake must come from plain drinking water because food contributes negligible water.
  4. About 20% of total water intake typically comes from food, with the remainder from beverages. Correct answer.

Explanation

For healthy adults, roughly 80% of total water intake comes from fluids and about 20% from water contained in foods such as fruits, vegetables, and soups. This is a general population estimate and varies with diet composition.

Question 29Nutrition Science Foundations

Which mineral is a component of thyroid hormones and is therefore essential for regulating metabolic rate?

  1. Copper
  2. Zinc
  3. Iodine Correct answer.
  4. Selenium

Explanation

Iodine is incorporated into thyroxine (T4) and triiodothyronine (T3), which regulate basal metabolic rate and growth. Selenium supports deiodinase enzymes but is not itself a structural component of the hormones.

Question 30Nutrition Science Foundations

A client wants to know what the term 'essential amino acid' means. Which description is most accurate?

  1. An amino acid that must be supplied by the diet because the body cannot synthesize it in sufficient quantity. Correct answer.
  2. An amino acid that the body can synthesize in adequate amounts from other compounds.
  3. An amino acid that is found exclusively in animal-derived protein foods.
  4. An amino acid that is only required during periods of intense resistance training.

Explanation

Essential amino acids cannot be synthesized by the body at a rate sufficient to meet needs, so they must come from dietary protein. There are nine such amino acids for adults, including leucine, lysine, and tryptophan.

Question 31Nutrition Science Foundations

Which statement best describes the function of dietary fiber in the digestive tract?

  1. Fiber is absorbed directly into the bloodstream and used as a primary fuel for skeletal muscle.
  2. Fiber is fully digested in the stomach and provides about 4 kcal per gram.
  3. Fiber resists digestion by human enzymes and supports bowel regularity and substrate for colonic bacteria. Correct answer.
  4. Fiber blocks the absorption of all vitamins and minerals from the small intestine.

Explanation

Dietary fiber is resistant to human digestive enzymes; soluble fibers are fermented by colonic bacteria while insoluble fibers add bulk and support motility. These effects contribute to regularity and gut health rather than serving as a direct energy source for muscle.

Question 32Nutrition Science Foundations

A client asks which macronutrient provides the most energy per gram. Which answer is correct?

  1. Protein, at 4 kcal per gram
  2. Carbohydrate, at 4 kcal per gram
  3. Fat, at 9 kcal per gram Correct answer.
  4. Alcohol, at 7 kcal per gram

Explanation

Fat yields approximately 9 kcal per gram, compared with about 4 kcal per gram for carbohydrate and protein. Alcohol provides about 7 kcal per gram but is not a macronutrient nutrient in the same sense and is not the highest of these values.

Question 33Nutrition Science Foundations

Which statement about dietary cholesterol is most accurate?

  1. Dietary cholesterol is found only in plant oils such as olive and canola.
  2. Dietary cholesterol is the single largest determinant of blood cholesterol in most people.
  3. Dietary cholesterol is an essential nutrient that must be consumed daily.
  4. Dietary cholesterol has a smaller effect on blood cholesterol than saturated and trans fat intake for most people. Correct answer.

Explanation

For most people, saturated and trans fatty acids raise blood LDL cholesterol more than dietary cholesterol itself, and the body synthesizes most of its cholesterol endogenously. Cholesterol is found in animal foods, not plant oils.

Question 34Nutrition Science Foundations

A client wants to reduce added sugar intake. Which change most directly reduces added sugars without removing naturally occurring nutrients?

  1. Replacing sweetened yogurt with plain yogurt and adding fresh fruit. Correct answer.
  2. Eliminating all fruit from the diet to avoid sugar.
  3. Switching from whole milk to skim milk.
  4. Replacing white rice with brown rice.

Explanation

Swapping sweetened yogurt for plain yogurt with fruit removes added sugar while preserving protein, calcium, and the naturally occurring sugars and fiber of fruit. Whole fruit is not a source of added sugar and provides micronutrients and fiber.

Question 35Nutrition Science Foundations

A client reports frequent muscle cramps and asks which electrolyte imbalance is most commonly implicated in exercise-associated cramping. Which factor is most relevant?

  1. Sodium and fluid losses through sweating Correct answer.
  2. Chronically low dietary calcium
  3. High dietary potassium intake
  4. Excess dietary phosphorus

Explanation

Exercise-associated cramping is often linked to sodium and fluid losses through sweating, particularly in salty sweaters and hot conditions. Replacing sodium and fluid is a common practical strategy, though cramping is multifactorial.

Question 36Nutrition Science Foundations

A client following a low-carbohydrate diet asks how protein needs might change. Which consideration is most accurate?

  1. Protein should be restricted below 0.8 g/kg to maintain ketosis.
  2. Adequate protein should still be met from the established range, and attention to total energy and micronutrient variety remains important. Correct answer.
  3. Protein needs always double on a low-carbohydrate diet regardless of training.
  4. Protein intake becomes irrelevant because ketones replace all amino acid functions.

Explanation

Lowering carbohydrate does not eliminate the need for adequate protein or micronutrients; protein intake should still meet evidence-based ranges and be distributed across meals. Diet quality and total energy remain central regardless of macronutrient pattern.

Question 37Nutrition Science Foundations

A vegetarian client wants to improve protein quality without adding meat. Which practice is most effective?

  1. Eating only one type of plant protein at each meal.
  2. Combining complementary plant proteins such as legumes with grains across the day. Correct answer.
  3. Avoiding all legumes because they contain antinutrients.
  4. Relying solely on fruit as a protein source.

Explanation

Combining complementary plant proteins, such as legumes with grains, supplies a fuller essential amino acid profile and improves overall protein quality. Variety across the day supports meeting all essential amino acids without animal foods.

Question 38Nutrition Science Foundations

A client drinks several cups of coffee with meals and asks whether this affects mineral status. Which statement is most accurate?

  1. Coffee completely blocks calcium absorption for 24 hours after each cup.
  2. Coffee dramatically increases iron absorption from plant foods.
  3. Coffee polyphenols and caffeine can modestly inhibit non-heme iron absorption when consumed with iron-rich meals. Correct answer.
  4. Coffee has no measurable effect on any mineral absorption.

Explanation

Polyphenols in coffee and tea can inhibit non-heme iron absorption when consumed with meals, so separating them from iron-rich meals is a practical strategy. The effect is meaningful but modest and does not apply equally to all minerals.

Question 39Nutrition Science Foundations

A client wants to know how to estimate their daily energy expenditure. Which component typically accounts for the largest share in a sedentary adult?

  1. Basal metabolic rate Correct answer.
  2. Exercise activity thermogenesis
  3. Non-exercise activity thermogenesis
  4. Thermic effect of food

Explanation

Basal metabolic rate, the energy needed for basic physiological functions at rest, typically accounts for the majority of total daily energy expenditure in sedentary adults. Activity thermogenesis and the thermic effect of food contribute smaller, variable shares.

Question 40Nutrition Science Foundations

A client asks whether a high-fiber meal affects blood glucose response. Which explanation is most accurate?

  1. Fiber speeds gastric emptying and raises postprandial glucose more sharply.
  2. Fiber has no effect on postprandial glucose because it is not absorbed.
  3. Fiber converts directly into glucose in the stomach.
  4. Viscous soluble fiber can slow gastric emptying and glucose absorption, blunting the postprandial rise. Correct answer.

Explanation

Viscous soluble fibers form a gel that slows gastric emptying and the rate of glucose absorption, producing a lower postprandial glucose response. This is why fiber-rich foods often have a lower glycemic impact than refined foods.

Question 41Nutrition Science Foundations

A client training twice daily asks about carbohydrate needs. Which approach best supports performance across sessions?

  1. Spreading carbohydrate intake across the day and around training to support glycogen availability. Correct answer.
  2. Consuming all carbohydrate in one large meal after the final session.
  3. Replacing carbohydrate entirely with protein to spare glycogen.
  4. Keeping carbohydrate intake very low to enhance fat oxidation in all sessions.

Explanation

Distributing carbohydrate across the day and around training sessions supports glycogen availability for repeated efforts. Total intake should match training load, and timing near sessions helps recovery between bouts.

Question 42Nutrition Science Foundations

A client asks which dietary pattern is most consistent with the Mediterranean-style approach. Which choice best reflects it?

  1. Exclusive reliance on red meat and butter with minimal plant foods.
  2. High intake of refined grains, processed meats, and full-fat dairy with low vegetable intake.
  3. Emphasis on vegetables, fruits, legumes, whole grains, olive oil, and fish with limited processed foods. Correct answer.
  4. A diet consisting mainly of sports supplements and protein powders.

Explanation

The Mediterranean-style pattern emphasizes plant foods, olive oil as a primary fat, fish, and limited processed foods. It is associated with favorable cardiovascular and metabolic outcomes.

Question 43Nutrition Science Foundations

A client asks about the safety of a very low-calorie diet for rapid weight loss. Which response is most appropriate for a nutrition coach?

  1. Recommend it for everyone because faster loss is always better.
  2. Suggest the client try it without any monitoring for several months.
  3. Tell the client that calories do not matter for weight loss.
  4. Note that very low-calorie diets carry risks and should be supervised by a qualified medical professional, and refer appropriately. Correct answer.

Explanation

Very low-calorie diets can produce rapid loss but carry risks such as nutrient deficiencies, gallstones, and electrolyte disturbances, so medical supervision is appropriate. Scope of practice requires referral rather than independent prescription.

Question 44Nutrition Science Foundations

A client reports frequent headaches and poor concentration on a low-carbohydrate diet. Which explanation is most plausible?

  1. Excess dietary fat directly causes dehydration and headaches.
  2. Headaches are unrelated to diet and should be ignored.
  3. Reduced carbohydrate intake can lower glycogen and water stores, contributing to transient fatigue and headaches. Correct answer.
  4. Protein intake always causes headaches during dieting.

Explanation

When carbohydrate intake drops, glycogen and associated water stores fall, which can contribute to transient fatigue, headache, and reduced training quality. Sodium and fluid losses during this transition can worsen symptoms.

Question 45Nutrition Science Foundations

A client asks why whole grains are preferred over refined grains for metabolic health. Which explanation is most accurate?

  1. Refined grains are always lower in calories than whole grains.
  2. Whole grains contain no carbohydrate and therefore do not affect blood glucose.
  3. Refined grains contain more fiber and micronutrients than whole grains.
  4. Whole grains retain bran and germ, providing fiber and micronutrients that support glycemic control and satiety. Correct answer.

Explanation

Whole grains retain the bran and germ, which supply fiber, B vitamins, minerals, and phytochemicals that support satiety and slower glucose absorption. Refining removes much of these components.

Question 46Nutrition Science Foundations

A client with a history of kidney stones asks about dietary calcium. Which statement is most accurate?

  1. Adequate dietary calcium consumed with meals can bind oxalate in the gut and reduce oxalate absorption. Correct answer.
  2. Restricting dietary calcium to very low levels reliably prevents stone formation.
  3. Calcium supplements should always be taken without food to prevent stones.
  4. Dietary calcium has no relationship to oxalate absorption.

Explanation

Calcium consumed with oxalate-rich foods can bind oxalate in the intestinal lumen, reducing its absorption and subsequent urinary oxalate. This is why adequate dietary calcium is generally recommended rather than severe restriction.

Question 47Nutrition Science Foundations

A client wants to know why replacing saturated fat with unsaturated fat is recommended for cardiovascular risk. Which mechanism best explains the benefit?

  1. Replacing saturated fat with unsaturated fat lowers LDL cholesterol and improves the lipid profile. Correct answer.
  2. Unsaturated fats raise LDL cholesterol more than saturated fats.
  3. Saturated fat has no effect on LDL cholesterol.
  4. Unsaturated fats eliminate the need for any dietary fat.

Explanation

Substituting unsaturated fats, especially polyunsaturated fats, for saturated fat lowers LDL cholesterol and is associated with reduced cardiovascular risk. The benefit comes from the replacement, not from simply adding fat.

Question 48Nutrition Science Foundations

A client on a proton-pump inhibitor asks about nutrient absorption. Which nutrient is most commonly affected by long-term acid suppression?

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

Explanation

Gastric acid is needed to release vitamin B12 from food proteins and to support absorption, so long-term acid suppression can impair B12 status. Vitamin C, E, and potassium are not primarily dependent on gastric acid for absorption.

Question 49Nutrition Science Foundations

A client asks how the body responds to a prolonged energy deficit. Which adaptation is most consistent with metabolic adaptation?

  1. Protein needs become zero during a deficit.
  2. Fat oxidation stops entirely during a deficit.
  3. Resting energy expenditure declines partly because of reduced body mass and adaptive thermogenesis. Correct answer.
  4. Total daily energy expenditure increases substantially as body mass falls.

Explanation

As body mass falls, resting energy expenditure declines partly because smaller tissues require less energy, and adaptive thermogenesis can further lower expenditure. This helps explain why weight loss slows over time despite continued adherence.

Question 50Nutrition Science Foundations

A client asks whether a high-protein diet harms healthy kidneys. Which statement is most accurate?

  1. Protein intake should be kept below 0.4 g/kg for all adults.
  2. High protein intake reliably causes kidney damage in healthy adults.
  3. Kidney function is unrelated to protein intake.
  4. Higher protein intake is generally not harmful to healthy kidneys, though individuals with existing kidney disease require individualized guidance. Correct answer.

Explanation

Current evidence does not show that higher protein intake damages healthy kidneys, though people with pre-existing kidney disease need individualized medical guidance. Extremely low protein intakes are not appropriate for most adults.