Step-by-Step Guidance for Nutrition Exam Study (Chapters 1–3)

Q1. Define and give examples of each: Nutrient, Organic (in nutrition/chemistry), Inorganic (in nutrition/chemistry), Essential nutrient, Energy, Energy-yielding nutrients, Calories, Phytochemicals, Energy density, Nutrient density, Micronutrients, Macronutrients, Vitamins, Minerals, Science of nutrition, Control group, Correlation, Double-blind experiment, Experimental group, Placebo, Variables, Experimental studies, Epidemiological studies, Dietary Reference Intake, Estimated Average Requirement (EAR), Recommended Dietary Allowance (RDA), Adequate Intake (AI), Tolerable Upper Intake Level (UL), Estimated Energy Requirement (EER), Acceptable Macronutrient Distribution Ranges (AMDR), Nutrition Assessment, Anthropometric, Deficiency, Healthy People 2020, Registered Dietitian Nutritionist (RDN)

Background

Topic: Nutrition Fundamentals & Terminology

This question tests your understanding of key terms and concepts foundational to nutrition science. Knowing definitions and examples helps you build a strong base for more advanced topics.

Key Terms & Concepts:

• Nutrient: A substance in food that provides energy or helps build/maintain body tissues.

• Organic: In nutrition, refers to compounds containing carbon (e.g., carbohydrates, fats, proteins, vitamins).

• Inorganic: Substances not containing carbon (e.g., minerals, water).

• Essential nutrient: Must be obtained from the diet because the body cannot make it in sufficient amounts.

• Energy: The capacity to do work, measured in calories.

• Energy-yielding nutrients: Nutrients that provide calories (carbohydrates, fats, proteins).

• Calories: Unit of energy; 1 calorie = energy needed to raise 1g water by 1°C.

• Phytochemicals: Non-nutrient compounds in plants with health benefits.

• Energy density: Calories per gram of food.

• Nutrient density: Nutrients per calorie of food.

• Micronutrients: Needed in small amounts (vitamins, minerals).

• Macronutrients: Needed in large amounts (carbohydrates, fats, proteins).

• Vitamins: Organic micronutrients essential for health.

• Minerals: Inorganic micronutrients essential for health.

• Science of nutrition: Study of nutrients and how they affect health.

Step-by-Step Guidance

1. Review your textbook or lecture notes for the definitions of each term listed. Focus on understanding the meaning and significance of each.

2. For each term, write a brief definition in your own words. Try to include an example where applicable (e.g., for "essential nutrient," list vitamin C).

3. Group similar terms together (e.g., micronutrients and macronutrients) to help remember their differences and examples.

4. For terms related to research (e.g., control group, double-blind experiment), think about how they are used in nutrition studies and why they matter.

5. For assessment terms (e.g., anthropometric, deficiency), consider how they are used to evaluate nutritional status.

Try solving on your own before revealing the answer!

Final Answer:

See your textbook or lecture notes for full definitions and examples. For instance:

• Nutrient: A substance in food that provides energy, supports growth, or helps maintain body functions. Example: Protein.

• Organic: Contains carbon; examples include carbohydrates, fats, proteins, vitamins.

• Inorganic: Does not contain carbon; examples include minerals and water.

• Essential nutrient: Must be obtained from the diet; example: Vitamin C.

• Energy-yielding nutrients: Carbohydrates (4 kcal/g), fats (9 kcal/g), proteins (4 kcal/g).

• Micronutrients: Vitamins and minerals.

• Macronutrients: Carbohydrates, fats, proteins.

Understanding these terms is crucial for success in nutrition courses and for interpreting scientific studies.

Q2. List the areas that influence our food choices, and give an example of at least 4 of them. Which of these is MOST influential in the food choices we make?

Background

Topic: Factors Affecting Food Choices

This question tests your knowledge of the psychological, social, and environmental factors that impact what people eat.

Key Terms:

• Food choice influences: Factors such as taste, culture, convenience, cost, emotions, health, advertising, etc.

Step-by-Step Guidance

1. Recall the main factors that influence food choices. Common ones include taste, culture, convenience, cost, emotions, health, and advertising.

2. For each factor, think of a real-life example. For instance, "taste" might be choosing pizza because you like the flavor.

3. Identify which factor is considered most influential according to your textbook or lecture notes (often taste).

4. Write down at least four factors and their examples.

Try solving on your own before revealing the answer!

Final Answer:

• Taste: Choosing foods you enjoy (e.g., pizza).

• Culture: Eating traditional foods (e.g., sushi in Japan).

• Convenience: Selecting foods that are easy to prepare (e.g., microwave meals).

• Cost: Buying foods that fit your budget (e.g., store-brand products).

• Most influential: Taste is usually the most influential factor in food choices.

Q3. Fill in the following chart using Table 1-2 on pg 8 as a guide. You should be prepared to do the calculations shown in the Calculation Corner on page 10.

Background

Topic: Nutrient Classification & Energy Calculations

This question tests your ability to classify nutrients as organic/inorganic, energy-yielding, macro/micro, and to perform basic nutrition calculations.

Key Terms & Formulas:

• Organic nutrients: Carbohydrates, fats, proteins, vitamins.

• Inorganic nutrients: Minerals, water.

• Energy-yielding nutrients: Carbohydrates, fats, proteins.

• Macronutrients: Carbohydrates, fats, proteins.

• Micronutrients: Vitamins, minerals.

• Calories per gram:

  • Fat: $9$ kcal/g

  • Protein: $4$ kcal/g

  • Carbohydrate: $4$ kcal/g

Step-by-Step Guidance

1. Review Table 1-2 in your textbook to see how nutrients are classified.

2. For each nutrient, determine if it is organic or inorganic, energy-yielding or not, and whether it is a macro- or micronutrient.

3. Practice calculating calories from grams of each macronutrient using the formulas:

   • $\text{Calories from fat} = \text{grams of fat} \times 9$

   • $\text{Calories from protein} = \text{grams of protein} \times 4$

   • $\text{Calories from carbohydrate} = \text{grams of carbohydrate} \times 4$

4. Set up a chart with columns for each classification and fill in the information for each nutrient.

Try solving on your own before revealing the answer!

Final Answer:

• Fat: Organic, energy-yielding, macronutrient, 9 kcal/g

• Protein: Organic, energy-yielding, macronutrient, 4 kcal/g

• Carbohydrate: Organic, energy-yielding, macronutrient, 4 kcal/g

• Vitamins: Organic, not energy-yielding, micronutrient

• Minerals: Inorganic, not energy-yielding, micronutrient

• Water: Inorganic, not energy-yielding, neither macro nor micro

Use these classifications to fill in your chart and practice calculations as shown in your textbook.

Q4. Know how to calculate the total and percent calories from each macronutrient if given the grams of each nutrient in a serving.

Background

Topic: Macronutrient Energy Calculations

This question tests your ability to use basic math to determine the energy contribution of macronutrients in a food.

Key Formulas:

• $\text{Calories from fat} = \text{grams of fat} \times 9$

• $\text{Calories from protein} = \text{grams of protein} \times 4$

• $\text{Calories from carbohydrate} = \text{grams of carbohydrate} \times 4$

• $\text{Percent calories from macronutrient} = \frac{\text{Calories from macronutrient}}{\text{Total calories}} \times 100$

Step-by-Step Guidance

1. Identify the grams of fat, protein, and carbohydrate in the serving.

2. Calculate the calories from each macronutrient using the formulas above.

3. Add the calories from fat, protein, and carbohydrate to get the total calories.

4. Calculate the percent of total calories from each macronutrient using the percent formula.

Try solving on your own before revealing the answer!

Final Answer:

For example, if a food contains 10g fat, 20g protein, and 30g carbohydrate:

• Calories from fat: $10 \times 9 = 90$ kcal

• Calories from protein: $20 \times 4 = 80$ kcal

• Calories from carbohydrate: $30 \times 4 = 120$ kcal

• Total calories: $90 + 80 + 120 = 290$ kcal

• Percent calories from fat: $\frac{90}{290} \times 100 \approx 31\%$

• Percent calories from protein: $\frac{80}{290} \times 100 \approx 28\%$

• Percent calories from carbohydrate: $\frac{120}{290} \times 100 \approx 41\%$

These calculations help you understand the energy distribution in foods.

Q5. Compare and contrast experimental studies and epidemiological studies. Name some types of studies that belong in each category. What are the advantages and disadvantages of each type of study?

Background

Topic: Nutrition Research Methods

This question tests your understanding of how nutrition science is studied and the strengths/weaknesses of different research designs.

Key Terms:

• Experimental studies: Research where variables are manipulated to observe effects (e.g., clinical trials).

• Epidemiological studies: Research observing populations to find patterns and correlations (e.g., cohort studies).

Step-by-Step Guidance

1. Define experimental and epidemiological studies.

2. List types of studies in each category (e.g., randomized controlled trials for experimental; cohort, case-control, cross-sectional for epidemiological).

3. Compare advantages (e.g., experimental studies can show causation; epidemiological studies can study large populations).

4. Contrast disadvantages (e.g., experimental studies may be expensive; epidemiological studies may only show correlation).

Try solving on your own before revealing the answer!

Final Answer:

• Experimental studies: Manipulate variables; types include randomized controlled trials, laboratory studies. Advantages: Can show cause and effect. Disadvantages: May be costly, limited generalizability.

• Epidemiological studies: Observe populations; types include cohort, case-control, cross-sectional studies. Advantages: Can study large groups, find patterns. Disadvantages: Cannot prove causation, only correlation.

Q6. Know how to calculate the Estimated Energy Requirement (EER) for someone.

Background

Topic: Energy Requirements

This question tests your ability to use formulas to estimate daily calorie needs based on factors like age, gender, weight, height, and physical activity.

Key Formula:

• $\text{EER} = \text{Estimated Energy Requirement}$

• General formula (for adults):

  $\text{EER} = \text{Basal Metabolic Rate} + \text{Physical Activity} + \text{Thermic Effect of Food}$

• Specific formulas may vary by gender and age; see your textbook for the exact equation.

Step-by-Step Guidance

1. Gather the person's age, gender, weight, height, and physical activity level.

2. Find the appropriate EER formula for their demographic in your textbook.

3. Plug in the values for weight (kg), height (cm), age (years), and physical activity factor.

4. Calculate each component (BMR, activity, thermic effect) as directed by the formula.

Try solving on your own before revealing the answer!

Final Answer:

For example, for adult women:

$\text{EER} = 354 - (6.91 \times \text{age}) + \text{PA} \times [(9.36 \times \text{weight}) + (726 \times \text{height})]$

For adult men:

$\text{EER} = 662 - (9.53 \times \text{age}) + \text{PA} \times [(15.91 \times \text{weight}) + (539.6 \times \text{height})]$

"PA" is the physical activity factor. Plug in the values to estimate daily calorie needs.

Q7. For each of the components of nutrition assessment, tell what it is, what it is used for, and give an example.

Background

Topic: Nutrition Assessment

This question tests your understanding of how nutritional status is evaluated using different methods.

Key Terms:

• Anthropometric: Measurements of body size/shape (e.g., height, weight).

• Laboratory tests: Blood, urine, or other tests to assess nutrient levels.

• Historical information: Medical, dietary, and social history.

Step-by-Step Guidance

1. List each assessment type: anthropometric, laboratory, historical.

2. Define what each type measures or assesses.

3. Describe what each is used for (e.g., anthropometric for growth, lab tests for nutrient deficiencies).

4. Give an example for each (e.g., BMI for anthropometric, blood iron for lab, diet recall for historical).

Try solving on your own before revealing the answer!

Final Answer:

• Anthropometric: Measures body size/shape; used to assess growth or obesity; example: BMI.

• Laboratory tests: Assess nutrient levels; used to detect deficiencies; example: blood iron test.

• Historical information: Collects medical/diet history; used to identify risk factors; example: 24-hour diet recall.

Q8. What is malnutrition? What does it include? How are over and undernutrition different?

Background

Topic: Nutrition Status

This question tests your understanding of malnutrition and its types.

Key Terms:

• Malnutrition: Poor nutrition from too much or too little intake.

• Undernutrition: Not enough nutrients.

• Overnutrition: Too many nutrients/calories.

Step-by-Step Guidance

1. Define malnutrition and its scope.

2. Explain the difference between undernutrition and overnutrition.

3. Give examples of each (e.g., vitamin deficiency for undernutrition, obesity for overnutrition).

Try solving on your own before revealing the answer!

Final Answer:

• Malnutrition: Includes both undernutrition (deficiency) and overnutrition (excess).

• Undernutrition: Not enough nutrients; example: iron deficiency anemia.

• Overnutrition: Too many nutrients/calories; example: obesity.

Q9. Name the top 3 causes of death in the United States. Which of those 3 are strongly related to nutrition?

Background

Topic: Nutrition and Health Outcomes

This question tests your knowledge of public health and the role of nutrition in disease.

Key Terms:

• Chronic diseases: Long-term illnesses often related to diet.

Step-by-Step Guidance

1. Recall the top 3 causes of death (usually heart disease, cancer, stroke).

2. Identify which are strongly related to nutrition (heart disease, some cancers).

3. Explain how nutrition affects these diseases.

Try solving on your own before revealing the answer!

Final Answer:

• Top 3 causes: Heart disease, cancer, stroke.

• Heart disease and some cancers are strongly related to nutrition.

Q10. Give at least 3 tips for evaluating whether an article or website with nutrition information in it is a reliable source of information.

Background

Topic: Evaluating Nutrition Information

This question tests your ability to critically assess sources of nutrition information.

Key Terms:

• Reliable source: Trustworthy, evidence-based information.

Step-by-Step Guidance

1. Think about what makes a source reliable (e.g., credentials, references, objectivity).

2. List at least three criteria or tips for evaluating sources.

3. Apply these tips to a sample article or website.

Try solving on your own before revealing the answer!

Final Answer:

• Check the author's credentials (e.g., RDN, PhD).

• Look for references to scientific studies.

• Assess whether the information is objective and not promoting products.