I85PREP
⌘ K
QCHP Dietitian study materials
QCHP Dietitian study resources

QCHP Dietitian practice questions

One question at a time. Build your QCHP Dietitian understanding.

First 50 of 200 questions. Each one lists the choices, the correct answer, and an explanation. The checker at the top of this page saves progress in this browser when it is available.

Continue in the practice tool above to load more questions, 50 at a time.

Question 1Nutrition Science and Biochemistry

Which macronutrient provides the most energy per gram when metabolized?

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

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 and Biochemistry

Dietary protein quality is primarily determined by which characteristic?

  1. The proportion of non-essential amino acids present
  2. The molecular weight of the protein chain
  3. The total nitrogen content of the food
  4. The pattern of essential amino acids relative to human needs Correct answer.

Explanation

Protein quality reflects how well a food's essential amino acid pattern matches human requirements and how digestible the protein is. A protein supplying all essential amino acids in adequate amounts is high quality.

Question 3Nutrition Science and Biochemistry

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

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

Explanation

Salivary amylase hydrolyzes alpha-1,4 glycosidic bonds in starch, initiating carbohydrate digestion in the mouth. Pepsin and trypsin act on proteins, and lipase acts on lipids.

Question 4Nutrition Science and Biochemistry

Which vitamin functions as the primary coenzyme for carboxylation reactions such as those catalyzed by pyruvate carboxylase?

  1. Niacin
  2. Riboflavin
  3. Biotin Correct answer.
  4. Thiamin

Explanation

Biotin is the coenzyme for carboxylase enzymes, including pyruvate carboxylase and acetyl-CoA carboxylase. It carries activated carbon dioxide during carboxylation reactions.

Question 5Nutrition Science and Biochemistry

Which mineral is a central component of the thyroid hormones that regulate basal metabolic rate?

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

Explanation

Iodine is incorporated into thyroxine and triiodothyronine, which regulate basal metabolic rate. Without adequate iodine, thyroid hormone synthesis declines.

Question 6Nutrition Science and Biochemistry

Which form of stored carbohydrate is found primarily in the liver and skeletal muscle of humans?

  1. Dextrin
  2. Starch
  3. Glycogen Correct answer.
  4. Cellulose

Explanation

Glycogen is the branched glucose polymer used for carbohydrate storage in human liver and muscle. Cellulose and starch are plant polysaccharides, and dextrins are digestion intermediates.

Question 7Nutrition Science and Biochemistry

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

  1. Triglyceride stored in adipose tissue
  2. Low-density lipoprotein cholesterol Correct answer.
  3. Total phospholipid
  4. High-density lipoprotein cholesterol

Explanation

Elevated low-density lipoprotein cholesterol is a causal risk factor for atherosclerotic cardiovascular disease. High-density lipoprotein is generally considered protective.

Question 8Nutrition Science and Biochemistry

Which process converts glucose into pyruvate while generating ATP without requiring oxygen?

  1. Beta-oxidation
  2. Glycolysis Correct answer.
  3. Gluconeogenesis
  4. Oxidative phosphorylation

Explanation

Glycolysis breaks glucose into pyruvate and generates a small amount of ATP through substrate-level phosphorylation without oxygen. Beta-oxidation and oxidative phosphorylation relate to fatty acid and mitochondrial energy metabolism.

Question 9Nutrition Science and Biochemistry

A patient consumes 2000 kcal per day and 60 g of protein. What percentage of total energy comes from protein?

  1. 12 percent Correct answer.
  2. 30 percent
  3. 6 percent
  4. 24 percent

Explanation

Protein provides 4 kcal per gram, so 60 g equals 240 kcal. Dividing 240 by 2000 and multiplying by 100 gives 12 percent of total energy.

Question 10Nutrition Science and Biochemistry

Which amino acid is considered conditionally essential during periods of rapid growth or metabolic stress?

  1. Glutamine Correct answer.
  2. Aspartate
  3. Alanine
  4. Serine

Explanation

Glutamine is normally synthesized in adequate amounts but can become conditionally essential during catabolic stress or rapid growth. Alanine, aspartate, and serine are generally non-essential.

Question 11Nutrition Science and Biochemistry

Which enzyme is the rate-limiting step of cholesterol synthesis?

  1. HMG-CoA reductase Correct answer.
  2. Lipoprotein lipase
  3. Hormone-sensitive lipase
  4. Carnitine palmitoyltransferase I

Explanation

HMG-CoA reductase catalyzes the committed, rate-limiting step of cholesterol biosynthesis and is the target of statin drugs. The other enzymes act in lipid transport or fatty acid oxidation.

Question 12Nutrition Science and Biochemistry

Why does a diet deficient in vitamin C impair collagen synthesis?

  1. It increases degradation of mature collagen fibers
  2. It blocks absorption of dietary calcium
  3. It prevents hydroxylation of proline and lysine residues Correct answer.
  4. It inhibits synthesis of collagen mRNA

Explanation

Vitamin C is a cofactor for prolyl and lysyl hydroxylase, which hydroxylate proline and lysine in procollagen. Without hydroxylation, the triple helix is unstable and collagen cannot mature properly.

Question 13Nutrition Science and Biochemistry

Which hormone is released from adipose tissue and acts to reduce food intake?

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

Explanation

Leptin is secreted by adipocytes and signals the hypothalamus to reduce appetite and increase energy expenditure. Ghrelin from the stomach has the opposite effect.

Question 14Nutrition Science and Biochemistry

A vegan client needs to improve protein quality. Which strategy is most appropriate?

  1. Consume only fruit sources of protein
  2. Restrict total protein intake to 0.4 g per kg
  3. Increase intake of refined sugars
  4. Combine complementary plant proteins such as legumes and grains Correct answer.

Explanation

Legumes are low in methionine but rich in lysine, while grains are the reverse, so combining them provides a more complete essential amino acid pattern. This improves protein quality in plant-based diets.

Question 15Nutrition Science and Biochemistry

Which metabolic state most directly stimulates gluconeogenesis in the liver?

  1. Prolonged fasting with low insulin and high glucagon Correct answer.
  2. High insulin and low glucagon
  3. Immediately after a high-carbohydrate meal
  4. Elevated blood glucose with increased insulin secretion

Explanation

Prolonged fasting lowers insulin and raises glucagon, which promotes hepatic gluconeogenesis to maintain blood glucose. High insulin states favor glucose uptake and storage instead.

Question 16Nutrition Science and Biochemistry

Which vitamin deficiency is classically associated with impaired blood clotting due to reduced synthesis of prothrombin?

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

Explanation

Vitamin K is required for gamma-carboxylation of glutamate residues in clotting factors such as prothrombin. Deficiency reduces functional activity of these factors and impairs coagulation.

Question 17Nutrition Science and Biochemistry

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

  1. Insoluble fiber directly stimulates insulin secretion
  2. Soluble fiber slows gastric emptying and glucose absorption Correct answer.
  3. Fiber increases the glycemic index of a meal
  4. Fiber is fully digested to glucose in the small intestine

Explanation

Soluble fibers form viscous gels that slow gastric emptying and nutrient absorption, blunting postprandial glucose rises. Insoluble fibers mainly add bulk and are not digested to glucose.

Question 18Nutrition Science and Biochemistry

Which enzyme converts dietary triglycerides into monoglycerides and free fatty acids in the small intestine?

  1. Salivary amylase
  2. Pancreatic lipase Correct answer.
  3. Pepsin
  4. Lactase

Explanation

Pancreatic lipase, with colipase, hydrolyzes triglycerides to monoglycerides and free fatty acids in the small intestine. The other enzymes act on carbohydrates or proteins.

Question 19Nutrition Science and Biochemistry

Which mineral's absorption is enhanced by vitamin C through its reduction to the more absorbable ferrous form?

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

Explanation

Vitamin C reduces ferric iron to ferrous iron, which is absorbed more efficiently in the small intestine. This interaction is especially relevant for non-heme iron from plant foods.

Question 20Nutrition Science and Biochemistry

Which compound is the primary energy currency generated by cellular respiration?

  1. ATP Correct answer.
  2. Pyruvate
  3. Acetyl-CoA
  4. NADH

Explanation

ATP is the direct energy currency used by cellular processes, generated through substrate-level and oxidative phosphorylation. NADH and acetyl-CoA are carriers and intermediates that feed into ATP production.

Question 21Nutrition Science and Biochemistry

A client on a ketogenic diet shows elevated blood ketones. Which metabolic shift explains this finding?

  1. Reduced lipolysis in adipose tissue
  2. Enhanced glycogen synthesis in muscle
  3. Increased glycolysis in the liver
  4. Increased hepatic fatty acid oxidation and ketogenesis Correct answer.

Explanation

Very low carbohydrate intake lowers insulin and drives lipolysis, delivering fatty acids to the liver for beta-oxidation. Excess acetyl-CoA is converted to ketone bodies through ketogenesis.

Question 22Nutrition Science and Biochemistry

Which statement best explains why trans fatty acids raise cardiovascular risk more than saturated fatty acids?

  1. They are rapidly oxidized to carbon dioxide in the liver
  2. They inhibit intestinal absorption of all dietary fats
  3. They increase HDL cholesterol without affecting LDL
  4. They raise LDL cholesterol and lower HDL cholesterol simultaneously Correct answer.

Explanation

Industrial trans fatty acids raise LDL cholesterol and lower HDL cholesterol, producing an unfavorable lipid profile. Saturated fatty acids raise LDL but do not lower HDL to the same extent.

Question 23Nutrition Science and Biochemistry

In a patient with chronic kidney disease, which mechanism best explains the development of hyperkalemia when potassium intake is high?

  1. Reduced glomerular filtration limiting potassium excretion Correct answer.
  2. Enhanced cellular uptake of potassium
  3. Increased aldosterone secretion
  4. Increased renal potassium excretion

Explanation

Reduced glomerular filtration limits the kidney's capacity to excrete potassium, so high intake can raise serum potassium. Enhanced cellular uptake or increased aldosterone would lower serum potassium.

Question 24Nutrition Science and Biochemistry

Which biochemical explanation best accounts for the neurological symptoms of thiamin deficiency?

  1. Excess serotonin synthesis in the brain
  2. Impaired oxidative decarboxylation reduces ATP production in glucose-dependent neurons Correct answer.
  3. Increased GABA receptor sensitivity
  4. Defective myelin cholesterol synthesis

Explanation

Thiamin pyrophosphate is required for pyruvate dehydrogenase, alpha-ketoglutarate dehydrogenase, and transketolase. Deficiency impairs glucose oxidation, and neurons, which depend heavily on glucose, are especially vulnerable.

Question 25Nutrition Science and Biochemistry

Which metabolic adaptation explains the protein-sparing effect of adequate carbohydrate intake during energy restriction?

  1. Carbohydrate suppresses glucagon and reduces gluconeogenesis from amino acids Correct answer.
  2. Carbohydrate blocks intestinal amino acid absorption
  3. Carbohydrate increases urea excretion from amino acids
  4. Carbohydrate directly inhibits muscle protein synthesis

Explanation

Adequate carbohydrate raises insulin and suppresses glucagon, reducing hepatic gluconeogenesis from amino acids. This spares body protein during energy restriction.

Question 26Nutrition Science and Biochemistry

Which vitamin functions as a coenzyme in the decarboxylation of α-keto acids such as pyruvate and α-ketoglutarate?

  1. Riboflavin
  2. Thiamin Correct answer.
  3. Niacin
  4. Pyridoxine

Explanation

Thiamin pyrophosphate (TPP) is the coenzyme for dehydrogenase complexes that decarboxylate α-keto acids, including pyruvate dehydrogenase and α-ketoglutarate dehydrogenase. Riboflavin and niacin are also involved in these complexes but as electron carriers, not in decarboxylation. Pyridoxine is primarily involved in amino acid metabolism.

Question 27Nutrition Science and Biochemistry

A client follows a strict vegan diet and asks about ensuring adequate intake of essential amino acids. Which combination of plant foods best provides a complete amino acid profile?

  1. Rice and beans Correct answer.
  2. Corn and bananas
  3. Fruit and nuts
  4. Potatoes and carrots

Explanation

Combining grains (low in lysine, high in methionine) with legumes (low in methionine, high in lysine) creates a complementary protein pattern that supplies all essential amino acids. Other combinations listed do not provide complementary limiting amino acids.

Question 28Nutrition Science and Biochemistry

During prolonged fasting, which substrate is primarily used by the brain after adaptation, and from which precursor is it derived?

  1. Lactate from muscle glycogen
  2. Amino acids from muscle protein
  3. Glucose from glycerol
  4. Ketone bodies from fatty acids Correct answer.

Explanation

After several days of fasting, the liver converts fatty acids into ketone bodies (acetoacetate and β-hydroxybutyrate), which can cross the blood-brain barrier and replace glucose as the major fuel for the brain. This protein-sparing adaptation reduces the need for gluconeogenesis from muscle protein.

Question 29Nutrition Science and Biochemistry

Which statement best explains why a diet high in refined carbohydrates can lead to increased blood triglyceride levels?

  1. High insulin levels directly stimulate adipose tissue lipolysis.
  2. Refined carbohydrates inhibit lipoprotein lipase, reducing triglyceride clearance.
  3. Refined carbohydrates increase intestinal absorption of dietary fats.
  4. Excess glucose is converted to fatty acids in the liver via de novo lipogenesis. Correct answer.

Explanation

When carbohydrate intake exceeds immediate energy needs and glycogen stores, the liver converts excess glucose into fatty acids through de novo lipogenesis, which are then esterified into triglycerides and exported as VLDL. This mechanism is a key reason high refined carbohydrate intake can raise blood triglycerides.

Question 30Nutrition Science and Biochemistry

A patient with a rare genetic defect in the enzyme phenylalanine hydroxylase is at risk for which biochemical consequence?

  1. Accumulation of phenylalanine and deficiency of tyrosine Correct answer.
  2. Accumulation of tyrosine and deficiency of phenylalanine
  3. Enhanced synthesis of melanin from phenylalanine
  4. Increased conversion of phenylalanine to dopamine

Explanation

Phenylalanine hydroxylase catalyzes the conversion of phenylalanine to tyrosine. A defect in this enzyme leads to elevated blood phenylalanine (phenylketonuria) and a downstream deficiency of tyrosine, which is conditionally essential in this disorder. If untreated, the excess phenylalanine can cause intellectual disability.

Question 31Food Science and Food Service Systems

Which cooking method is best described as cooking food in a tightly covered pan using steam generated from a small amount of added liquid?

  1. Braising
  2. En papillote
  3. Steaming under pressure Correct answer.
  4. Poaching

Explanation

Steaming under pressure (pressure cooking) traps steam in a sealed vessel, raising temperature above 100°C and shortening cooking time. Braising uses liquid and long moist heat without pressure; poaching is submersion in gently simmering liquid. En papillote cooks in a folded parchment packet in an oven.

Question 32Food Science and Food Service Systems

A hospital kitchen must hold hot food before service. What is the minimum safe holding temperature for hot potentially hazardous foods?

  1. 63°C Correct answer.
  2. 50°C
  3. 57°C
  4. 70°C

Explanation

Hot holding must keep food at or above 63°C to prevent bacterial growth; below this, food enters the temperature danger zone. Temperatures of 50°C and 57°C are inside the danger zone. 70°C is a cooking target, not the minimum holding standard.

Question 33Food Science and Food Service Systems

In a food service system, which of the following is an example of a cook-chill production process?

  1. Assembling raw ingredients for the customer to cook
  2. Preparing food, blast chilling rapidly, and reheating for service Correct answer.
  3. Freezing raw ingredients before any heat treatment
  4. Cooking food and holding it hot until plating

Explanation

Cook-chill involves cooking, rapid blast chilling to below 3°C, chilled storage, then regeneration (reheating) before service. Holding hot is cook-hot-hold, and assembling raw ingredients is a conventional or assembly-serve approach. Freezing raw ingredients is not cook-chill because no cooking step occurs first.

Question 34Food Science and Food Service Systems

Which of the following is a primary function of dietary fiber in food science terms?

  1. Providing a concentrated energy source
  2. Serving as a complete protein source
  3. Supplying essential fatty acids
  4. Acting as a substrate for colonic fermentation Correct answer.

Explanation

Many fibers are fermentable by colonic bacteria, producing short-chain fatty acids. Fiber is largely non-digestible in the small intestine and provides little energy. It is not a protein or fat source.

Question 35Food Science and Food Service Systems

A dietitian is evaluating a standardized recipe that yields 50 portions but needs 120 portions. What factor should be applied to each ingredient quantity?

  1. 2.0
  2. 1.8
  3. 1.2
  4. 2.4 Correct answer.

Explanation

The conversion factor is the desired yield divided by the original yield: 120 ÷ 50 = 2.4. Multiplying each ingredient by 2.4 scales the recipe to 120 portions. Other values do not reflect the correct ratio.

Question 36Food Science and Food Service Systems

Which factor most directly increases the rate of non-enzymatic browning (Maillard reaction) during baking?

  1. Lowering the water activity of the food surface Correct answer.
  2. Removing all reducing sugars from the dough
  3. Reducing the surface temperature below 100°C
  4. Increasing the pH to strongly alkaline levels

Explanation

The Maillard reaction requires reducing sugars, amino groups, heat, and low moisture; drying the surface accelerates browning. Strongly alkaline conditions are not typical and are not the primary driver. Temperatures below 100°C slow browning, and removing reducing sugars removes a key reactant.

Question 37Food Science and Food Service Systems

Which of the following best describes the purpose of a HACCP plan in a hospital food service operation?

  1. To document employee training records only
  2. To specify the menu cycle for the year
  3. To identify, prevent, and control hazards at critical points in food production Correct answer.
  4. To calculate the food cost per portion

Explanation

HACCP is a systematic preventive approach that identifies biological, chemical, and physical hazards and establishes control at critical control points. Training records and menu planning are separate administrative functions. Costing is unrelated to hazard control.

Question 38Food Science and Food Service Systems

A patient requires a texture-modified diet. Which preparation technique best preserves nutrient content while producing a pureed consistency?

  1. Steaming vegetables, then pureeing with minimal added liquid Correct answer.
  2. Soaking vegetables in cold water for several hours before blending
  3. Frying vegetables in oil, then blending with a roux
  4. Boiling vegetables in a large volume of water, then mashing

Explanation

Steaming minimizes leaching of water-soluble vitamins, and pureeing with minimal liquid retains nutrients in the food. Boiling in large water volumes leaches vitamins into the cooking liquid. Frying adds fat and does not address nutrient retention, and prolonged soaking also leaches water-soluble vitamins.

Question 39Food Science and Food Service Systems

Which of the following is the most appropriate method to prevent cross-contamination in a hospital kitchen?

  1. Thawing raw meat on the counter near salad preparation
  2. Designating separate color-coded equipment for raw and ready-to-eat foods Correct answer.
  3. Using the same cutting board for raw poultry and ready-to-eat foods after a quick wipe
  4. Storing raw meat above ready-to-eat foods in the refrigerator

Explanation

Color-coded or dedicated equipment physically separates raw animal foods from ready-to-eat foods, preventing pathogen transfer. A quick wipe does not sanitize adequately. Storing raw meat above ready-to-eat foods allows drip contamination, and thawing on the counter near salads creates both temperature and cross-contamination risks.

Question 40Food Science and Food Service Systems

In food science, what is the primary effect of adding salt to ground meat before cooking?

  1. It destroys all microorganisms present
  2. It prevents Maillard browning
  3. It increases water-binding capacity and can affect texture Correct answer.
  4. It removes fat from the product

Explanation

Salt solubilizes myofibrillar proteins, increasing water-binding and altering texture, which is important in processed meats. Salt does not sterilize food, and it does not prevent browning or remove fat.

Question 41Food Science and Food Service Systems

Which of the following is a correct statement about the use of standardized recipes in food service?

  1. They eliminate the need for portion control
  2. They reduce consistency but lower labor cost
  3. They ensure consistent yield, quality, and nutrient content Correct answer.
  4. They are only required for therapeutic diets

Explanation

Standardized recipes specify ingredients, quantities, and procedures so that yield, quality, and nutrient content are consistent across production. They support portion control rather than eliminate it. They are used in all food service operations, not only therapeutic diets.

Question 42Food Science and Food Service Systems

A dietitian is planning a menu for a renal patient on a potassium-restricted diet. Which food choice is most appropriate to limit potassium content?

  1. Bananas
  2. Oranges
  3. Dried apricots
  4. Potatoes boiled and drained Correct answer.

Explanation

Boiling and draining potatoes leaches potassium into the cooking water, reducing the content in the food. Bananas, oranges, and dried apricots are all high-potassium foods and are generally restricted.

Question 43Food Science and Food Service Systems

Which of the following best explains why food should be cooled rapidly from 63°C to 5°C within a specified time in food service?

  1. To reduce the food cost
  2. To limit the time food spends in the temperature danger zone Correct answer.
  3. To improve the flavor of the food
  4. To increase the water activity of the food

Explanation

Rapid cooling limits the time food remains between 5°C and 63°C, the range where bacteria multiply fastest, reducing the risk of foodborne illness. Flavor, water activity, and cost are not the primary reasons for rapid cooling standards.

Question 44Food Science and Food Service Systems

Which of the following describes the process of gelatinization in starch cookery?

  1. Proteins denaturing and coagulating
  2. Fats emulsifying with water
  3. Starch granules absorb water and swell when heated, thickening the mixture Correct answer.
  4. Starch chains retrograding and forming a gel on cooling

Explanation

Gelatinization occurs when starch granules absorb water and swell on heating, releasing amylose and thickening the liquid. Retrogradation is a separate process occurring on cooling. Protein coagulation and fat emulsification involve different molecules.

Question 45Food Science and Food Service Systems

A food service manager needs to reduce energy use in a hospital kitchen. Which practice is most effective?

  1. Keeping refrigerator doors open during service
  2. Preheating ovens well before needed for each batch
  3. Matching equipment size to the production batch and turning off idle equipment Correct answer.
  4. Using the largest available appliance for every task

Explanation

Matching appliance size to the batch and shutting down idle equipment avoids unnecessary energy use. Preheating excessively, leaving refrigerator doors open, and using oversized appliances all waste energy.

Question 46Food Science and Food Service Systems

Which of the following is the most accurate description of the role of emulsifiers in food systems?

  1. They increase the surface tension between oil and water
  2. They prevent protein denaturation during heating
  3. They stabilize the dispersion of one liquid phase in another Correct answer.
  4. They act as a primary source of dietary fiber

Explanation

Emulsifiers lower interfacial tension and stabilize droplets of one liquid dispersed in another, such as oil in water. They reduce rather than increase surface tension. They do not prevent protein denaturation and are not fiber sources.

Question 47Food Science and Food Service Systems

A dietitian must verify the protein content of a blended enteral formula. Which food science principle explains why the formula should be checked for protein denaturation during processing?

  1. Protein is converted to carbohydrate during heating
  2. Protein content is unaffected by processing
  3. Protein content increases with refrigeration
  4. Heat treatment can denature proteins, altering solubility and consistency Correct answer.

Explanation

Heat processing can denature proteins, changing solubility and consistency, which affects formula stability and nutrient delivery. Protein content is not converted to carbohydrate, and refrigeration does not increase protein content.

Question 48Food Science and Food Service Systems

Which of the following is a correct principle of portion control in food service?

  1. Allowing staff to choose portion sizes freely
  2. Using a scoop or scale to standardize serving sizes Correct answer.
  3. Serving by eye to save time
  4. Increasing portion sizes to reduce waste

Explanation

Portion control uses standardized tools such as scoops, ladles, or scales to ensure consistent serving sizes and nutrient content. Eyeballing and free choice lead to inconsistency. Increasing portion sizes does not reduce waste.

Question 49Food Science and Food Service Systems

Which of the following best explains why acid is added when making a vinaigrette?

  1. To increase the water activity of the oil
  2. To increase the pH and thicken the dressing
  3. To denature proteins and create a gel
  4. To lower pH and help stabilize the emulsion Correct answer.

Explanation

Acid lowers pH, which can help stabilize an emulsion and contributes to flavor and microbial stability. Increasing pH would not thicken the dressing, and acid does not create a protein gel in vinaigrette. Water activity applies to the aqueous phase, not the oil.

Question 50Food Science and Food Service Systems

A hospital kitchen is implementing a food safety management system. Which document should be maintained to demonstrate that critical limits are met?

  1. A monitoring record for each critical control point Correct answer.
  2. The equipment purchase invoice
  3. The employee vacation schedule
  4. The annual menu cycle

Explanation

Monitoring records document that critical limits at each critical control point are met, providing evidence for the HACCP system. Menu cycles, vacation schedules, and purchase invoices do not demonstrate hazard control.