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6.3 Nutrition and Diet Therapy

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NCLEX-RN Registered Nurse

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1 Introduction

About the NCLEX-RN Exam Next Generation NCLEX (NGN) Clinical Judgment Measurement Model (NCJMM) How to Use This Course

2 Chapter 2: Management of Care

2.1 Legal Rights and Responsibilities 2.2 Advance Directives and Self-Determination 2.3 Informed Consent Protocols 2.4 Client Advocacy and Rights (HIPAA) 2.5 Assignment, Delegation, and Supervision 2.6 Five Rights of Delegation 2.7 Scope of Practice (RN vs LPN vs UAP) 2.8 Ethical Practice Principles

3 Chapter 3: Safety and Infection Prevention and Control

3.1 Standard Precautions and Hand Hygiene 3.2 Transmission-Based Precautions (Contact, Droplet, Airborne) 3.3 PPE Donning and Doffing Sequences 3.4 Fall Prevention and Restraints 3.5 Fire Safety (RACE/PASS) 3.6 Disaster Triage and Emergency Response

4 Chapter 4: Health Promotion and Maintenance

4.1 Growth and Development (Erikson/Piaget) 4.2 Developmental Stages: Infancy through Older Adult 4.3 Maternal and Newborn Care (Antepartum) 4.4 Intrapartum Care and Fetal Monitoring 4.5 Postpartum Care (BUBBLE-HE) 4.6 Health Screening Guidelines 4.7 Immunization Schedules

5 Chapter 5: Psychosocial Integrity

5.1 Therapeutic Communication Techniques 5.2 Non-Therapeutic Communication (What to Avoid) 5.3 Anxiety Disorders and Mental Health Concepts 5.4 Schizophrenia: Hallucinations and Delusions 5.5 Depression and Suicide Assessment 5.6 Substance Misuse and Withdrawal 5.7 Grief and End-of-Life Care

6 Chapter 6: Basic Care and Comfort

6.1 Mobility and Hazards of Immobility 6.2 Assistive Devices (Crutches, Canes, Walkers) 6.3 Nutrition and Diet Therapy 6.4 Enteral Nutrition (Tube Feeding) 6.5 Bowel Elimination and Ostomy Care 6.6 Urinary Elimination and Catheter Care

7 Chapter 7: Pharmacological and Parenteral Therapies

7.1 Medication Administration Rights 7.2 Medication Calculations 7.3 High-Alert Medications: Insulins 7.4 High-Alert Medications: Anticoagulants 7.5 High-Alert Medications: Opioids 7.6 High-Alert Medications: Digoxin and Electrolytes 7.7 IV Therapy and Complications 7.8 Blood Product Administration 7.9 Total Parenteral Nutrition (TPN)

8 Chapter 8: Reduction of Risk Potential

8.1 Laboratory Values: Hematology (CBC) 8.2 Laboratory Values: Metabolic Panel (BMP) 8.3 Laboratory Values: Coagulation Studies 8.4 Vital Signs and Trend Recognition 8.5 Perioperative Care (Pre-Op and Post-Op) 8.6 Nasogastric Tubes and Therapeutic Procedures

9 Chapter 9: Physiological Adaptation

9.1 Fluid Imbalances (Hypovolemia and Hypervolemia) 9.2 Arterial Blood Gases (ABGs) and Acid-Base Balance 9.3 Medical Emergencies: Stroke (CVA) 9.4 Medical Emergencies: Myocardial Infarction (MONA) 9.5 Diabetic Emergencies (Hypoglycemia and DKA) 9.6 Respiratory Conditions (COPD, Pneumonia) 9.7 Cardiac Conditions (Heart Failure) 9.8 Neurological Conditions (Seizures)

6.3 Nutrition and Diet Therapy

Key Takeaways Explain This Topic AI

Clear liquid diet includes only transparent fluids at room temperature: water, broth, gelatin, apple juice, tea—inadequate for nutrition beyond 24-48 hours

Renal diet restricts sodium, potassium, phosphorus, and often protein (unless on dialysis, then protein needs increase)

Cardiac/heart-healthy diet focuses on low sodium (<2g/day), low saturated fat, and low cholesterol to reduce cardiac workload

Dysphagia diets progress from pureed to mechanical soft to regular; thickened liquids prevent aspiration

High-potassium foods include bananas, oranges, potatoes, tomatoes, and dried fruits—restrict in renal failure, encourage for hypokalemia

Last updated: January 2026

Diet therapy is a cornerstone of disease management. Nurses must understand which diets are prescribed for specific conditions, what foods are allowed or restricted, and how to educate patients for dietary compliance.

Dietary Progression

When patients transition from NPO status (nothing by mouth) back to regular eating, they typically progress through liquid diets:

Clear Liquid Diet

Definition: Fluids that are transparent at room temperature and leave minimal residue in the GI tract.

Allowed Foods:

  • Water, tea, coffee (without cream)
  • Clear broth (chicken, beef, vegetable)
  • Gelatin (Jell-O)
  • Popsicles, ice chips
  • Clear fruit juices (apple, white grape)—no pulp
  • Carbonated beverages
  • Sports drinks

NOT Allowed:

  • Milk, cream, or dairy products
  • Fruit juices with pulp (orange juice)
  • Any solid foods

Clinical Use:

  • Pre-operative bowel preparation
  • Post-operative first oral intake
  • Acute GI illness

Nutritional Adequacy: Inadequate for long-term use. Provides minimal protein, calories, vitamins, and minerals. Should not be used for more than 24-48 hours without supplementation.

Full Liquid Diet

Definition: All items on clear liquid diet PLUS foods that are liquid at body temperature.

Added Foods:

  • Milk and milkshakes
  • Cream soups (strained)
  • Pudding, custard, ice cream
  • Yogurt (without fruit pieces)
  • Cooked cereals (thinned)
  • Fruit juices with pulp

Clinical Use:

  • Transition from clear liquids to soft diet
  • Patients with chewing or swallowing difficulties
  • Wired jaw, oral surgery recovery

Nutritional Adequacy: Better than clear liquids but still inadequate for long-term use without supplementation.

Therapeutic Diets by Condition

  • Condition Diet Type Key Restrictions Key Inclusions
  • Renal Failure Renal diet Na+, K+, Phosphorus, Protein (pre-dialysis) Increased protein (on dialysis)
  • Heart Failure/HTN Cardiac/Low sodium Sodium (<2g), Saturated fat, Cholesterol Fruits, vegetables, whole grains
  • Diabetes Diabetic/Carb-controlled Simple sugars, Portion sizes Consistent carb intake, fiber
  • Liver Disease Low sodium, Low protein (if encephalopathy) Sodium, Protein (varies) Adequate calories
  • Celiac Disease Gluten-free Wheat, barley, rye Rice, corn, gluten-free grains
  • GI Surgery Low residue/Low fiber High fiber foods Easily digestible foods
  • Renal Diet

Patients with chronic kidney disease require dietary modifications because failing kidneys cannot excrete excess electrolytes or waste products.

Key Restrictions

  • Nutrient Why Restricted Foods to AVOID
  • Sodium Fluid retention, hypertension Processed foods, canned soups, deli meats, soy sauce
  • Potassium Hyperkalemia causes cardiac arrhythmias Bananas, oranges, potatoes, tomatoes, dried fruits
  • Phosphorus Hyperphosphatemia causes bone disease Dairy products, nuts, cola, chocolate
  • Protein Reduces uremic waste products (pre-dialysis) High-protein foods in excess
  • High-Potassium Foods to Avoid
  • Memory Device: "POTASSIUM"
  • P otatoes
  • O ranges (and orange juice)
  • T omatoes
  • A vocados
  • S pinach
  • S quash
  • I nstant coffee
  • U nprocessed bran
  • M elons (cantaloupe, honeydew)
  • Also: Bananas, dried fruits (raisins, prunes), beans, nuts
  • Special Note: Dialysis Patients

Patients on dialysis have increased protein needs because protein is lost during dialysis. While pre-dialysis patients restrict protein, dialysis patients need 1.2-1.5 g/kg/day of protein.

Cardiac Diet (Heart-Healthy Diet)

The cardiac diet reduces workload on the heart and helps control risk factors.

  • Key Principles
  • Low Sodium: <2000 mg/day (often <1500 mg for heart failure)
  • Low Saturated Fat: <7% of total calories
  • Low Cholesterol: <200 mg/day
  • High Fiber: Whole grains, fruits, vegetables
  • Omega-3 Fatty Acids: Fatty fish (salmon, mackerel)
  • Foods to AVOID
  • Processed and cured meats (bacon, hot dogs, deli meat)
  • Canned soups and vegetables (high sodium unless low-sodium variety)
  • Fried foods
  • Full-fat dairy products
  • Baked goods with trans fats
  • Foods to INCLUDE
  • Fresh fruits and vegetables
  • Whole grains
  • Lean proteins (chicken, fish)
  • Low-fat dairy
  • Olive oil, nuts (in moderation)
  • Diabetic Diet

The focus of diabetic nutrition is consistent carbohydrate intake and blood glucose control.

  • Key Principles
  • Carbohydrate Counting: Consistent carb intake at each meal
  • Complex Carbohydrates: Whole grains over refined grains
  • High Fiber: Slows glucose absorption
  • Low Glycemic Index: Foods that don't spike blood sugar
  • Regular Meal Times: Prevents hypoglycemia/hyperglycemia
  • Carbohydrate Awareness
  • 1 carbohydrate serving = 15 grams of carbs
  • Typical meal: 45-60 grams of carbs (3-4 servings)
  • Focus on consistent timing and portions
  • Dysphagia Diets

Patients with swallowing difficulties require modified textures to prevent aspiration.

Diet Levels (National Dysphagia Diet)

  • Level Texture Description
  • Level 1: Pureed Pudding-like Smooth, no lumps, no chewing required
  • Level 2: Mechanically Altered Moist, semi-solid Ground or finely chopped, cohesive
  • Level 3: Advanced/Soft Soft solid Easy to chew, moist
  • Regular All textures No restrictions
  • Thickened Liquids

Thin liquids are the most likely to cause aspiration. Thickening agents (starch-based or gum-based) modify liquid consistency:

  • Consistency Description Comparison
  • Nectar-thick Coats spoon, pours slowly Apricot nectar
  • Honey-thick Drips slowly from spoon Honey at room temperature
  • Pudding-thick Holds shape, needs spoon Pudding

Nursing Responsibilities:

  • Ensure correct diet tray is delivered
  • Supervise meals for high-risk patients
  • Position upright (90 degrees) during and 30-60 minutes after meals
  • Have suction available
  • Enteral Nutrition Readiness

Before starting any oral diet, assess:

  • Gag reflex present
  • Bowel sounds active
  • Alert and able to protect airway
  • No nausea or vomiting
  • On the Exam

NCLEX tests your ability to:

  • Match diets to conditions (renal diet for CKD, low sodium for CHF)
  • Identify foods to avoid for specific restrictions
  • Recognize dietary progression (clear → full liquid → soft → regular)
  • Understand dysphagia precautions
  • Key Takeaways
  • Clear liquids are inadequate for nutrition beyond 24-48 hours
  • Renal diet restricts sodium, potassium, phosphorus, and protein (pre-dialysis)
  • Cardiac diet focuses on low sodium, low saturated fat
  • Dysphagia diets modify texture and thicken liquids to prevent aspiration
  • High-potassium foods: bananas, oranges, potatoes, tomatoes, dried fruits