Nutrition: Macros and Hydration

ISSA CPT Study Guide Exam

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1 Exam Map and Applied Science

ISSA CPT Exam Format and Blueprint Functional Anatomy and Biomechanics Muscle Actions and Planes of Motion Energy Systems and Physiology Cardiorespiratory Systems and Training Adaptations

2 Nutrition and Assessment

Nutrition: Macros and Hydration Supplements and Special-Population Nutrition Client Consultation and Goal Setting Fitness Assessments and Screening Movement Screens and Posture

3 Program Design

Program Design Principles and Periodization Resistance Training Variables Cardio Programming and Zones Flexibility, Mobility, and Recovery Special Populations Program Modifications

4 Exercise Technique

Squat, Hinge, and Lower-Body Technique Push, Pull, and Upper-Body Technique Core, Balance, and Stability Training Cueing, Spotting, and Error Correction Progressive Overload and Regression

5 Professional Practice and Exam Day

Scope, Ethics, and Professional Responsibility Business, Liability, and Client Records Behavior Change and Adherence ISSA CPT Exam Strategy and Review

Nutrition: Macros and Hydration

Key Takeaways Explain This Topic AI

Macronutrients: carbohydrates (4 kcal/g), protein (4 kcal/g), fats (9 kcal/g)—each supports distinct physiological roles.

ISSA CPT scope permits general nutrition education, not medical nutrition therapy or individualized meal plans for disease treatment.

Protein intake of 1.6–2.2 g/kg/day supports hypertrophy goals in resistance-trained clients when combined with adequate training.

Hydration needs vary; ~3.7 L/day men and 2.7 L/day women (total fluids) are AI references; sweat losses increase exercise requirements.

Refer clients with eating disorders, diabetes management, or renal disease to registered dietitians.

Last updated: September 2026

Quick Answer: Carbs fuel high-intensity work, protein repairs muscle, fats support hormones and cell membranes. CPTs give general guidance—MyPlate, adequate protein, hydration—not prescribe therapeutic diets. Know kcal per gram and when to refer out.

Nutrition: Macros and Hydration

Nutrition is 8% of the NCCPT blueprint but intersects every weight-management conversation. ISSA trains CPTs to deliver evidence-based general guidance within legal scope—not to replace registered dietitians (RDs) for clinical nutrition therapy.

Macronutrient Overview

Macro kcal/g Primary Roles CPT Guidance Range (general)
Carbohydrate 4 Primary high-intensity fuel, brain glucose 45–65% calories (AMD R)
Protein 4 Muscle repair, enzymes, immune function 10–35% calories; 1.2–2.2 g/kg active
Fat 9 Hormones, fat-soluble vitamins, energy 20–35% calories

Alcohol: 7 kcal/g, not a macronutrient but adds energy without nutrients.

Carbohydrates

Stored as muscle glycogen (~400–500 g) and liver glycogen (~100 g). Depletion below ~200 g total impairs high-intensity performance. Recommend whole grains, fruits, vegetables, legumes over refined sugars for general health clients.

Pre-workout: easily digestible carbs 1–3 hours before training if needed. Post-workout: protein + carbs within reasonable window supports glycogen repletion—not mandatory "30-minute anabolic window" urgency for recreational clients.

Protein

Essential amino acids must come from diet (leucine triggers muscle protein synthesis). Distribute protein across 3–4 meals (~0.25–0.4 g/kg per meal) for optimal MPS signaling in trained individuals.

Vegetarian/vegan clients need complementary proteins and may require higher total intake to match leucine thresholds.

Fats

Emphasize unsaturated fats (olive oil, nuts, fatty fish). Omega-3 (EPA/DHA) supports inflammation management. Trans fats—minimize. Very-low-fat diets may impair hormone production in active women (relative energy deficiency in sport—RED-S).

Energy Balance and Weight Management

1 lb fat ≈ 3,500 kcal deficit (simplified). Sustainable fat loss: 0.5–1% body weight per week via modest deficit (300–500 kcal/day) plus resistance training to preserve lean mass.

CPTs can explain energy balance concepts but should not diagnose obesity-related comorbidities or prescribe very-low-calorie diets (<800 kcal) without medical supervision.

Hydration

Population Guideline
Sedentary men ~3.7 L total fluids/day (AI)
Sedentary women ~2.7 L total fluids/day (AI)
Exercise +500–1000 mL per hour heavy sweat

Pre-exercise: 5–7 mL/kg 4 hours before. During: 200–300 mL every 15–20 min if sweating. Post: 1.5 L per kg body weight lost (weigh before/after).

Hyponatremia risk from over-drinking plain water in endurance events—include electrolytes for sessions >60–90 minutes in heat.

Scope of Practice Table

In Scope (CPT) Out of Scope (Refer RD/MD)
MyPlate, portion awareness Medical nutrition therapy
General protein/carb/fat education Renal/diabetic meal prescriptions
Hydration for exercise Eating disorder treatment plans
Food label reading basics Supplement protocols for disease
Worked Scenario: Weight Loss Client

Tom, 35, wants to lose 20 lb. CPT action: calculate estimated TDEE (Mifflin-St Jeor × activity factor), suggest 400 kcal deficit, prioritize 1.8 g/kg protein, maintain resistance training 3×/week, track waist circumference weekly. Do not diagnose metabolic syndrome if fasting glucose unknown—refer for labs.

Exam Traps

Trap: Prescribing 800 kcal diets for obese clients without physician oversight.

Trap: Selling specific supplement stacks as required for certification scope questions.

Trap: Claiming CPTs can treat celiac disease with gluten-free meal plans—educate and refer.

ISSA Nutrition Philosophy

Emphasize habit-based changes : add vegetables, improve protein distribution, reduce sugar-sweetened beverages. Align advice with client preferences and culture for adherence. Nutrition supports training—it does not replace sound program design.