Nutrition Exam Study Guide: Step-by-Step Guidance for Key Concepts

Study Guide - Smart Notes

Tailored notes based on your materials, expanded with key definitions, examples, and context.

Q1. What elements make up carbohydrates? How are carbohydrates and dietary fiber classified? What are some examples of soluble & insoluble fiber, simple & complex carbs? What is the RDA for carbohydrates for adults (in grams per day)?

Background

Topic: Carbohydrates and Dietary Fiber

This question tests your understanding of the chemical composition of carbohydrates, their classification, examples of different types, and recommended dietary intake.

Key Terms and Concepts:

Carbohydrates: Organic molecules made of carbon, hydrogen, and oxygen.
Dietary Fiber: Non-digestible carbohydrates, classified as soluble or insoluble.
Simple Carbohydrates: Monosaccharides and disaccharides.
Complex Carbohydrates: Polysaccharides (e.g., starch, fiber).
RDA: Recommended Dietary Allowance for carbohydrates (in grams per day).

Step-by-Step Guidance

Identify the elements that make up carbohydrates. Think about the basic chemical formula for carbohydrates.
Recall how carbohydrates are classified (simple vs. complex) and how dietary fiber is further classified (soluble vs. insoluble).
List examples of soluble fiber (e.g., oats, apples) and insoluble fiber (e.g., wheat bran, vegetables), as well as examples of simple and complex carbohydrates.
Review the RDA for carbohydrates for adults. Check your textbook or notes for the specific value in grams per day.

Try solving on your own before revealing the answer!

Final Answer:

Carbohydrates are made up of carbon, hydrogen, and oxygen. They are classified as simple (monosaccharides, disaccharides) and complex (polysaccharides). Dietary fiber is classified as soluble (e.g., oats, apples) and insoluble (e.g., wheat bran, vegetables). The RDA for carbohydrates for adults is 130 grams per day.

Q2. What monosaccharide is the most abundant “sugar” in fruits and veggies? Which monosaccharide is often referred to as “blood sugar” and is the most abundant sugar in the body?

Background

Topic: Monosaccharides and Their Roles

This question tests your knowledge of the types of monosaccharides found in foods and their physiological roles.

Key Terms:

Monosaccharide: The simplest form of carbohydrate (single sugar unit).
Glucose: Often called "blood sugar"; main energy source for the body.
Fructose: Abundant in fruits and vegetables.

Step-by-Step Guidance

Recall the three main monosaccharides: glucose, fructose, and galactose.
Identify which monosaccharide is most abundant in fruits and vegetables.
Determine which monosaccharide is referred to as "blood sugar" and is most abundant in the body.

Try solving on your own before revealing the answer!

Final Answer:

Fructose is the most abundant sugar in fruits and vegetables. Glucose is referred to as "blood sugar" and is the most abundant sugar in the body.

Q3. Outline how/where carbohydrates are digested, absorbed, & stored.

Background

Topic: Carbohydrate Digestion, Absorption, and Storage

This question tests your understanding of the digestive process for carbohydrates, including the organs involved and how carbohydrates are stored in the body.

Key Terms:

Digestion: Breakdown of carbohydrates into monosaccharides.
Absorption: Uptake of monosaccharides into the bloodstream.
Storage: Glycogen formation in liver and muscles.

Step-by-Step Guidance

Identify the organs where carbohydrate digestion begins and continues (mouth, stomach, small intestine).
Describe the enzymes involved in carbohydrate digestion (e.g., salivary amylase, pancreatic amylase).
Explain how monosaccharides are absorbed in the small intestine and transported to the liver.
Discuss how excess glucose is stored as glycogen in the liver and muscles.

Try solving on your own before revealing the answer!

Final Answer:

Carbohydrate digestion begins in the mouth, continues in the small intestine, and monosaccharides are absorbed into the bloodstream. Excess glucose is stored as glycogen in the liver and muscles.

Q4. Discuss the functions of carbohydrates/glucose in the body.

Background

Topic: Functions of Carbohydrates

This question tests your understanding of the physiological roles of carbohydrates and glucose.

Key Terms:

Glucose: Primary energy source for cells.
Carbohydrates: Provide energy, spare protein, prevent ketosis.

Step-by-Step Guidance

List the main functions of carbohydrates in the body (energy, protein sparing, preventing ketosis).
Explain how glucose is used by cells for energy production.
Discuss the role of carbohydrates in maintaining blood glucose levels.

Try solving on your own before revealing the answer!

Final Answer:

Carbohydrates provide energy, spare protein from being used for energy, and prevent ketosis. Glucose is the primary fuel for cells and is essential for brain function.

Q5. Describe how blood glucose levels are maintained and where it is stored. What is the role of the pancreas? Which hormones work together to maintain the blood glucose level within an acceptable range and from what organ (and specific cell types) are they released? What hormones are released from the adrenal glands during the “fight or flight” response?

Background

Topic: Blood Glucose Regulation

This question tests your understanding of hormonal regulation of blood glucose and the organs involved.

Key Terms:

Pancreas: Releases insulin and glucagon.
Insulin: Lowers blood glucose.
Glucagon: Raises blood glucose.
Adrenal Glands: Release epinephrine and cortisol during stress.

Step-by-Step Guidance

Identify where glucose is stored in the body (liver and muscles as glycogen).
Describe the role of the pancreas in blood glucose regulation.
List the hormones involved (insulin and glucagon), their functions, and the cell types that release them (beta and alpha cells).
Discuss the hormones released from the adrenal glands during the "fight or flight" response (epinephrine, cortisol).

Try solving on your own before revealing the answer!

Final Answer:

Blood glucose is maintained by insulin (from beta cells) and glucagon (from alpha cells) in the pancreas. Glucose is stored as glycogen in the liver and muscles. During stress, the adrenal glands release epinephrine and cortisol.

Q6. What is high fructose corn syrup (more specifically, what sugars make it up?) and why is it used in foods/drinks?

Background

Topic: High Fructose Corn Syrup (HFCS)

This question tests your understanding of HFCS composition and its use in the food industry.

Key Terms:

High Fructose Corn Syrup: Sweetener made from corn starch.
Glucose and Fructose: The two main sugars in HFCS.

Step-by-Step Guidance

Identify the sugars that make up HFCS (glucose and fructose).
Explain why HFCS is used in foods and drinks (cost, sweetness, stability).

Try solving on your own before revealing the answer!

Final Answer:

HFCS is made up of glucose and fructose. It is used in foods and drinks because it is inexpensive, sweet, and stable.

Q7. Briefly highlight what researchers suggest about the role(s) (both positive and negative) of carbohydrates in health conditions, such as diverticulosis, lactose intolerance, diabetes, and heart disease. What are the possible benefits and possible issues of consuming dietary fiber?

Background

Topic: Carbohydrates and Health

This question tests your understanding of the impact of carbohydrates and fiber on various health conditions.

Key Terms:

Diverticulosis: Condition related to low fiber intake.
Lactose Intolerance: Inability to digest lactose.
Diabetes: Blood glucose regulation issues.
Heart Disease: Linked to fiber intake.

Step-by-Step Guidance

Summarize the positive roles of carbohydrates and fiber in preventing or managing health conditions.
Discuss the negative effects of excessive or insufficient carbohydrate/fiber intake.
List the benefits of dietary fiber (e.g., improved digestion, reduced risk of heart disease).
Identify possible issues with fiber (e.g., gastrointestinal discomfort, nutrient absorption interference).

Try solving on your own before revealing the answer!

Final Answer:

Carbohydrates and fiber can help prevent diverticulosis and heart disease, but excessive intake may contribute to diabetes and gastrointestinal issues. Fiber benefits include improved digestion and reduced disease risk, but too much can cause discomfort.

Q8. Given an FDA health claim regarding fiber, be able to determine if it is considered valid.

Background

Topic: FDA Health Claims

This question tests your ability to evaluate the validity of health claims related to dietary fiber.

Key Terms:

FDA Health Claim: Statement about the health benefits of a nutrient.
Valid Claim: Supported by scientific evidence and approved by the FDA.

Step-by-Step Guidance

Review the criteria for a valid FDA health claim (scientific evidence, FDA approval).
Compare the health claim to FDA guidelines for fiber-related claims.
Determine if the claim meets the requirements for validity.

Try solving on your own before revealing the answer!

Final Answer:

A valid FDA health claim about fiber must be supported by scientific evidence and meet FDA guidelines. Check the claim against official FDA resources to confirm validity.

Q9. What is/are the role(s) of bacteria in the large intestine? Do humans have enough enzymes to digest all sugars (such as those found in beans, lentils, etc.)?

Background

Topic: Gut Microbiota and Carbohydrate Digestion

This question tests your understanding of the role of bacteria in digestion and human enzyme limitations.

Key Terms:

Gut Microbiota: Bacteria in the large intestine.
Enzymes: Proteins that catalyze digestion.
Oligosaccharides: Sugars humans may not fully digest.

Step-by-Step Guidance

Describe the functions of bacteria in the large intestine (fermentation, vitamin production).
Explain why humans lack certain enzymes to digest all sugars (e.g., oligosaccharides in beans).
Discuss the consequences of undigested sugars (gas, bloating).

Try solving on your own before revealing the answer!

Final Answer:

Bacteria in the large intestine ferment undigested carbohydrates, producing gases and vitamins. Humans lack enzymes to digest some sugars, such as those in beans, leading to gas production.

Q10. Define glycemic index and glycemic load.

Background

Topic: Glycemic Index and Glycemic Load

This question tests your understanding of how foods affect blood glucose levels.

Key Terms and Formulas:

Glycemic Index (GI): A measure of how quickly a food raises blood glucose.
Glycemic Load (GL): Takes into account GI and the amount of carbohydrate in a serving.

Key formula:

Step-by-Step Guidance

Define glycemic index and explain its significance.
Define glycemic load and explain how it is calculated.
Review the formula for glycemic load and practice applying it to a food example.

Try solving on your own before revealing the answer!

Final Answer:

Glycemic index measures how quickly a food raises blood glucose. Glycemic load considers both the GI and the amount of carbohydrate in a serving, calculated using the formula above.

Q11. What is the AI for fiber for adults (ages 19-50) in grams?

Background

Topic: Adequate Intake (AI) for Fiber

This question tests your knowledge of dietary recommendations for fiber.

Key Terms:

AI: Adequate Intake, a recommended amount when RDA is not established.
Fiber: Non-digestible carbohydrate.

Step-by-Step Guidance

Recall the AI for fiber for adults (ages 19-50) from your textbook or notes.
Compare the AI for men and women, if applicable.

Try solving on your own before revealing the answer!

Final Answer:

The AI for fiber for adults ages 19-50 is 38 grams for men and 25 grams for women.

Q12. What are ketones and how/or why are they formed? What is gluconeogenesis? What is glycogenolysis?

Background

Topic: Metabolic Pathways

This question tests your understanding of key metabolic processes related to carbohydrate and fat metabolism.

Key Terms:

Ketones: Molecules produced during fat breakdown.
Gluconeogenesis: Formation of glucose from non-carbohydrate sources.
Glycogenolysis: Breakdown of glycogen to glucose.

Step-by-Step Guidance

Define ketones and explain when they are formed (e.g., during fasting or low carbohydrate intake).
Describe gluconeogenesis and its importance in maintaining blood glucose.
Explain glycogenolysis and its role in releasing stored glucose.

Try solving on your own before revealing the answer!

Final Answer:

Ketones are produced during fat breakdown when carbohydrate intake is low. Gluconeogenesis is the creation of glucose from non-carbohydrate sources. Glycogenolysis is the breakdown of glycogen to release glucose.