NDT 2043 Final Exam Review: Comprehensive Study Notes for Nutrition

Chapter 1: Science of Nutrition

Definition of Nutrition

• Nutrition is the science that studies the interactions between living organisms and the substances they consume for sustenance, growth, and health.

Macronutrients Overview

• There are six classes of nutrients: carbohydrates, proteins, lipids (fats), vitamins, minerals, and water.

• Macronutrients are nutrients required in large amounts and include carbohydrates, proteins, and fats.

Caloric Values and Calculations

• Each macronutrient provides a specific number of calories per gram:

  • Carbohydrates: 4 kcal/g

  • Proteins: 4 kcal/g

  • Fats: 9 kcal/g

• To calculate the percentage of calories from each macronutrient in a meal:

  • Multiply grams of each macronutrient by its caloric value, sum for total calories, then divide each macronutrient's calories by the total and multiply by 100.

• Formula:

$\text{Percent of Calories from Nutrient} = \left(\frac{\text{Grams of Nutrient} \times \text{Calories per Gram}}{\text{Total Calories}}\right) \times 100$

• Some foods contain essential nutrients, which are nutrients the body cannot synthesize and must be obtained from the diet.

Other Key Concepts

• Chronically deficient or excessive intake of nutrients can lead to malnutrition.

• Understanding the Dietary Guidelines for Americans (DGA) is essential for healthful eating.

• Common assessment tools include MyPlate and the Acceptable Macronutrient Distribution Ranges (AMDRs).

Chapter 2: Tools for Healthful Eating

Components of a Healthy Diet

• A healthy diet is adequate, moderate, balanced, and varied.

• Dietary Guidelines provide science-based advice for healthy eating patterns.

• Food labels help consumers make informed choices; understanding serving sizes and daily values is crucial.

Food Sources and Meal Planning

• Identify nutrient-dense foods and distinguish them from energy-dense foods.

• Be able to read and interpret food labels, including sample labels and images.

Chapter 3: The Human Body & Digestion

Macronutrients and Digestion

• Macronutrients are digested and absorbed in the gastrointestinal tract.

• Key organs: mouth, esophagus, stomach, small intestine, large intestine.

• Enzymes and digestive juices facilitate the breakdown of food.

• Carbohydrates are primarily digested into glucose for energy.

Chapter 4: Carbohydrates

Types and Functions

• Monosaccharides are the simplest carbohydrates (e.g., glucose, fructose, galactose).

• Disaccharides consist of two monosaccharides (e.g., sucrose, lactose, maltose).

• Polysaccharides include starch, glycogen, and fiber.

• Fiber is important for digestive health and is not digested by human enzymes.

Carbohydrate Digestion and Absorption

• Enzymes break down carbohydrates into monosaccharides for absorption.

• Glucose is the main energy source for the body.

Chapter 5: Lipids

Types and Digestion

• Lipids include triglycerides, phospholipids, and sterols.

• Triglycerides are the most common dietary fat.

• Digestion involves emulsification by bile and breakdown by pancreatic enzymes.

Health Implications

• High intake of saturated and trans fats is associated with increased risk of heart disease.

• Unsaturated fats (monounsaturated and polyunsaturated) are considered healthier options.

Chapter 6: Proteins

Protein Requirements and Sources

• Proteins are made of amino acids; there are 20 amino acids, 9 of which are essential.

• Complete proteins contain all essential amino acids (e.g., animal sources, soy).

• Plant sources can be combined to provide all essential amino acids.

Protein Functions

• Proteins are required for tissue repair, enzyme and hormone production, and immune function.

Chapters 7 & 8: Metabolism, Water, and Minerals

Metabolism

• Metabolism includes all chemical reactions in the body.

• Glycolysis is the breakdown of glucose; it does not require oxygen (anaerobic).

• ATP (adenosine triphosphate) is the energy currency of the cell.

• Vitamins and minerals often act as cofactors in metabolic reactions.

Water and Fluid Balance

• Water is essential for life; fluid balance is maintained by intake and excretion.

• Electrolytes such as sodium and potassium regulate fluid balance and nerve function.

• High sodium intake is associated with hypertension.

Chapters 8 & 10: Vitamins and Supplements

Antioxidant Nutrients

• Vitamins C, E, and beta-carotene (a precursor to vitamin A) act as antioxidants, protecting cells from oxidative damage.

• Dietary supplements can provide nutrients but may also pose toxicity risks if overconsumed.

Chapter 11: Vitamins and Minerals

Deficiency and Toxicity

• Each vitamin and mineral has specific deficiency and toxicity symptoms.

• Fat-soluble vitamins (A, D, E, K) are stored in the body; water-soluble vitamins (B vitamins, C) are not stored and must be consumed regularly.

• Minerals are classified as major (needed in larger amounts) or trace (needed in smaller amounts).

Chapter 12: Food Safety & Regulation

Foodborne Illness and Prevention

• Foodborne illness is caused by pathogens such as bacteria, viruses, and parasites.

• Prevention includes proper food handling, cooking, and storage.

• Food safety regulations are enforced by agencies such as the FDA and USDA.

Chapter 13: Food Insecurity

Hunger and Food Access

• Food insecurity refers to limited or uncertain access to adequate food.

• It affects both the US and the world, with various programs in place to address hunger.

Chapter 10: Energy Balance, Body Weight, and Eating Disorders

Energy Balance and Body Weight

• Energy balance is the relationship between calories consumed and calories expended.

• Basal metabolic rate (BMR) is the energy expended at rest.

• Factors affecting BMR include age, sex, body composition, and genetics.

Eating Disorders

• Common eating disorders include anorexia nervosa, bulimia nervosa, and binge-eating disorder.

• These disorders have serious health consequences and require medical intervention.

Chapter 11: Nutrition & Fitness

Physical Activity and Nutrition

• Physical activity increases energy expenditure and supports overall health.

• Nutrition before, during, and after exercise is important for performance and recovery.

• Hydration is critical for athletes and active individuals.

Chapter 15: Nutrition Across the Lifespan

Dietary Guidelines for Different Life Stages

• Nutrient requirements vary by age, sex, and physiological status (e.g., pregnancy, lactation).

• Common nutrient deficiencies in children and older adults include iron, calcium, and vitamin D.

Sample Table: Macronutrient Caloric Values

Macronutrient	Calories per Gram
Carbohydrate	4 kcal
Protein	4 kcal
Lipid (Fat)	9 kcal

Sample Table: Fat-Soluble vs. Water-Soluble Vitamins

Type	Examples	Storage	Risk of Toxicity
Fat-Soluble	A, D, E, K	Stored in liver and fatty tissues	Higher
Water-Soluble	B vitamins, C	Not stored	Lower

Additional info: Where the original notes were brief, academic context and definitions have been added for clarity and completeness.