NUTRITION- NURS 4042 FINAL EXAM
Essential vs. Nonessential Nutrients
There are six major categories of nutrients required by the body:
1. Carbohydrates
2. Proteins
3. Lipids (fats)
4. Vitamins
5. Minerals
6. Water
Nutrients are classified as essential or nonessential depending on
whether the body can produce them on its own.
Essential nutrients are those that the body needs for normal
functioning but cannot synthesize in sufficient amounts. Because of this, they must be obtained
through dietary intake. In other words, when the body requires a nutrient for growth or
maintenance but lacks the ability to produce enough of it, that nutrient must come from food
sources.
Functions of essential nutrients include:
• Energy production:
Carbohydrates, proteins, and fats serve as sources of energy. Vitamins and minerals do
not directly provide energy but are necessary as cofactors that assist the body in utilizing
energy from macronutrients.
• Regulation of body processes:
Proteins, fats, vitamins, minerals, and water all contribute to regulating physiological
processes. Each vitamin has a specific regulatory role within the body.
• Growth and tissue repair:
Proteins, fats, minerals, and water are necessary for building, maintaining, and repairing
body tissues.
Nonessential nutrients are those that the body is capable of producing on its own, so they do not
need to be consumed through the diet. These nutrients can be synthesized from other substances
within the body.
In summary:
• Essential nutrients must be obtained from food or supplements.
• Nonessential nutrients can be produced internally and are not required in the diet.
Energy Provided per Gram
• Carbohydrates: 4 kcal per gram
• Protein: 4 kcal per gram
• Fat: 9 kcal per gram
Fats provide more than twice the energy per gram compared to
carbohydrates and proteins.
Functions of Carbohydrates, Proteins, and Fats
Carbohydrates
Carbohydrates are the body’s primary and most efficient source of energy. Glucose, a simple
carbohydrate, is especially important because it serves as the preferred fuel for the brain and
,muscles. It is also critical for cell development, particularly during periods of growth and
pregnancy.
Carbohydrates play a key role in maintaining stable blood glucose levels, which ensures a
consistent energy supply for daily activities such as movement and breathing. They are quickly
metabolized, making them an immediate energy source.
Dietary fiber, a type of carbohydrate, supports digestive health by promoting regular bowel
movements and may reduce the risk of conditions such as colorectal cancer and cardiovascular
disease. Fiber also contributes to maintaining a healthy gut microbiome.
Carbohydrates can be categorized into:
• Simple carbohydrates: monosaccharides and disaccharides (quick energy sources)
• Complex carbohydrates: polysaccharides (provide sustained energy and fiber)
Proteins
Proteins provide energy but are primarily known for their wide range of structural and functional
roles in the body. They are essential for the growth, repair, and maintenance of tissues such as
muscles, bones, and skin.
Key functions of proteins include:
• Supporting tissue growth and repair
• Acting as enzymes and hormones that regulate body processes
• Contributing to immune defense through antibodies and other immune proteins
• Maintaining fluid and electrolyte balance through osmotic pressure
• Helping regulate acid-base balance by acting as buffers
• Transporting substances such as oxygen (via hemoglobin and myoglobin) and nutrients
throughout the body
Proteins are also involved in forming structural components like collagen, which is important for
connective tissues, wound healing, and overall structural integrity.
Fats (Lipids)
, Fats are the most concentrated source of energy in the diet and serve as a major form of stored
energy in the body.
Their functions include:
• Providing long-term energy storage
• Insulating the body and helping regulate temperature
• Protecting vital organs through cushioning
• Supporting cell membrane structure
• Assisting in the production of hormones
• Promoting satiety by slowing digestion, which helps control hunger
Specific types of lipids have specialized roles:
• Triglycerides: store energy in adipose tissue
• Phospholipids: form cell membranes and help transport fats in body fluids
• Sterols (e.g., cholesterol): serve as precursors for bile, vitamin D, and hormones, and are
essential components of nerve tissue and cell membranes
Primary Roles of the Six Nutrient Classes
• Carbohydrates: Main source of energy; provide glucose for body cells
• Proteins: Build and repair tissues; support growth and maintenance
• Fats: Provide energy, insulation, and support for fat-soluble vitamin storage
• Vitamins: Assist enzymes in metabolic reactions; help release energy from
macronutrients
• Minerals: Support body structure (bones, teeth) and regulate physiological processes
• Water: Essential for hydration, nutrient transport, temperature regulation, and chemical
reactions
Best Way to Obtain Adequate Vitamins and Minerals
Vitamins do not supply energy but are necessary for releasing energy from carbohydrates, fats,
and proteins. Minerals contribute to structural components like bones and teeth and help regulate
fluid balance, muscle contraction, and nervous system activity.
The most effective way to ensure sufficient intake of vitamins and minerals is to consume a wide
variety of foods. Fruits and vegetables are especially rich in vitamins, while minerals are found
in foods such as dairy products, meats, legumes, fruits, and vegetables.
A balanced and varied diet helps provide adequate nutrients without exceeding recommended
amounts. Moderation and diversity in food choices are key to proper nutrition and overall health.
Nutrient Imbalances in the American Diet
The typical American diet often includes both excesses and deficiencies.
Common excesses:
• Saturated fats
• Trans fats
• Added sugars
• Sodium
• Refined grains
• Omega-6 fatty acids
High intake of these components is associated with increased risk of cardiovascular disease,
hypertension, type 2 diabetes, and certain cancers.
Essential vs. Nonessential Nutrients
There are six major categories of nutrients required by the body:
1. Carbohydrates
2. Proteins
3. Lipids (fats)
4. Vitamins
5. Minerals
6. Water
Nutrients are classified as essential or nonessential depending on
whether the body can produce them on its own.
Essential nutrients are those that the body needs for normal
functioning but cannot synthesize in sufficient amounts. Because of this, they must be obtained
through dietary intake. In other words, when the body requires a nutrient for growth or
maintenance but lacks the ability to produce enough of it, that nutrient must come from food
sources.
Functions of essential nutrients include:
• Energy production:
Carbohydrates, proteins, and fats serve as sources of energy. Vitamins and minerals do
not directly provide energy but are necessary as cofactors that assist the body in utilizing
energy from macronutrients.
• Regulation of body processes:
Proteins, fats, vitamins, minerals, and water all contribute to regulating physiological
processes. Each vitamin has a specific regulatory role within the body.
• Growth and tissue repair:
Proteins, fats, minerals, and water are necessary for building, maintaining, and repairing
body tissues.
Nonessential nutrients are those that the body is capable of producing on its own, so they do not
need to be consumed through the diet. These nutrients can be synthesized from other substances
within the body.
In summary:
• Essential nutrients must be obtained from food or supplements.
• Nonessential nutrients can be produced internally and are not required in the diet.
Energy Provided per Gram
• Carbohydrates: 4 kcal per gram
• Protein: 4 kcal per gram
• Fat: 9 kcal per gram
Fats provide more than twice the energy per gram compared to
carbohydrates and proteins.
Functions of Carbohydrates, Proteins, and Fats
Carbohydrates
Carbohydrates are the body’s primary and most efficient source of energy. Glucose, a simple
carbohydrate, is especially important because it serves as the preferred fuel for the brain and
,muscles. It is also critical for cell development, particularly during periods of growth and
pregnancy.
Carbohydrates play a key role in maintaining stable blood glucose levels, which ensures a
consistent energy supply for daily activities such as movement and breathing. They are quickly
metabolized, making them an immediate energy source.
Dietary fiber, a type of carbohydrate, supports digestive health by promoting regular bowel
movements and may reduce the risk of conditions such as colorectal cancer and cardiovascular
disease. Fiber also contributes to maintaining a healthy gut microbiome.
Carbohydrates can be categorized into:
• Simple carbohydrates: monosaccharides and disaccharides (quick energy sources)
• Complex carbohydrates: polysaccharides (provide sustained energy and fiber)
Proteins
Proteins provide energy but are primarily known for their wide range of structural and functional
roles in the body. They are essential for the growth, repair, and maintenance of tissues such as
muscles, bones, and skin.
Key functions of proteins include:
• Supporting tissue growth and repair
• Acting as enzymes and hormones that regulate body processes
• Contributing to immune defense through antibodies and other immune proteins
• Maintaining fluid and electrolyte balance through osmotic pressure
• Helping regulate acid-base balance by acting as buffers
• Transporting substances such as oxygen (via hemoglobin and myoglobin) and nutrients
throughout the body
Proteins are also involved in forming structural components like collagen, which is important for
connective tissues, wound healing, and overall structural integrity.
Fats (Lipids)
, Fats are the most concentrated source of energy in the diet and serve as a major form of stored
energy in the body.
Their functions include:
• Providing long-term energy storage
• Insulating the body and helping regulate temperature
• Protecting vital organs through cushioning
• Supporting cell membrane structure
• Assisting in the production of hormones
• Promoting satiety by slowing digestion, which helps control hunger
Specific types of lipids have specialized roles:
• Triglycerides: store energy in adipose tissue
• Phospholipids: form cell membranes and help transport fats in body fluids
• Sterols (e.g., cholesterol): serve as precursors for bile, vitamin D, and hormones, and are
essential components of nerve tissue and cell membranes
Primary Roles of the Six Nutrient Classes
• Carbohydrates: Main source of energy; provide glucose for body cells
• Proteins: Build and repair tissues; support growth and maintenance
• Fats: Provide energy, insulation, and support for fat-soluble vitamin storage
• Vitamins: Assist enzymes in metabolic reactions; help release energy from
macronutrients
• Minerals: Support body structure (bones, teeth) and regulate physiological processes
• Water: Essential for hydration, nutrient transport, temperature regulation, and chemical
reactions
Best Way to Obtain Adequate Vitamins and Minerals
Vitamins do not supply energy but are necessary for releasing energy from carbohydrates, fats,
and proteins. Minerals contribute to structural components like bones and teeth and help regulate
fluid balance, muscle contraction, and nervous system activity.
The most effective way to ensure sufficient intake of vitamins and minerals is to consume a wide
variety of foods. Fruits and vegetables are especially rich in vitamins, while minerals are found
in foods such as dairy products, meats, legumes, fruits, and vegetables.
A balanced and varied diet helps provide adequate nutrients without exceeding recommended
amounts. Moderation and diversity in food choices are key to proper nutrition and overall health.
Nutrient Imbalances in the American Diet
The typical American diet often includes both excesses and deficiencies.
Common excesses:
• Saturated fats
• Trans fats
• Added sugars
• Sodium
• Refined grains
• Omega-6 fatty acids
High intake of these components is associated with increased risk of cardiovascular disease,
hypertension, type 2 diabetes, and certain cancers.
