Perform with Dr. Andy Galpin
Perform with Dr. Andy Galpin

The Fundamentals of Nutrition, Hydration & Performance Fueling

August 5, 2026

AI Summary

5 min read

The 90% Rule: What Actually Works in Nutrition

Dr. Andy Galpin opens this audience Q&A episode with a framing device that reveals his entire philosophy: the "90%." Across thousands of different diets, eating styles, and nutritional programs, roughly 90% of what makes them effective is the same. The remaining 10% is individual variation—keto versus high-carb, intermittent fasting versus frequent meals, specific food eliminations. Most people get lost arguing about the 10% before they've mastered the 90%.

The 13–14 Non-Negotiables

Galpin walks through the consistent elements that appear in virtually every effective nutrition plan. First is food quality—mostly single-ingredient, minimally processed foods, most of the time. He is careful with his language: not "always," not "never," just "most of the time for most people." Second is caloric balance, which does not require calorie counting but does require some method of regulation. Time-restricted eating, eliminating food groups, or following a Mediterranean diet all work because they regulate caloric balance one way or another.

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What you'll learn

  • 1 (00:00) **Episode Introduction & Question Buckets** - Dr. Andy Galpin outlines five categories of audience questions on nutrition, hydration, and performance.
  • 2 (03:50) **The 90%: Foundational Nutrition Principles** - Galpin introduces the concept of the "90%," the common principles shared by nearly all effective nutrition plans.
  • 3 (05:20) **Principle 1: Food Quality** - The first and most critical principle is prioritizing whole, minimally processed foods.
  • 4 (07:15) **Principle 2: Caloric Balance** - Managing total energy intake relative to expenditure is non-negotiable for any effective plan.
  • 5 (08:58) **Principles 3-6: Protein, Carbs/Fats, Fiber, & Vegetables** - Specific macronutrient and micronutrient targets are essential for health and performance.
  • 6 (13:12) **Principles 7-9: Color Variety, Food Preparation, & Liquid Calories** - Expanding food diversity and being mindful of preparation methods and hidden calories.
  • 7 (19:57) **Principles 10-14: Sustainability, Safety, & Environment** - The final set of principles focuses on practical application and long-term adherence.

+ Full timestamped outline available in the app

Guests on this episode

Dr. Andy Galpin

Show Notes

In this episode, I answer your questions on nutrition, hydration, and recovery in our second audience Q&A. I start with what I call the 90%: the principles nearly every effective nutrition plan shares, from food quality and caloric balance to fiber targets, vegetable volume, color variety, and liquid calories. I then cover the four elements of fueling around training, glucose, amino acid availability, hydration, and GI distress, including the Galpin Equation for fluid intake during exercise. I walk through the three-step process I use to coach nutrition, which begins by adding nutrients rather than restricting them, and I explain when body recomposition is possible, what the protein data actually support, and why strength training is a bigger signal for muscle growth than protein. I close with what separates high performers from everyone else: energy management. This episode is for anyone who wants the fundamentals before the fine-tuning.

Show notes: https://www.performpodcast.com/episodes/fundamentals-of-nutrition-hydration-performance-fueling

Sponsors

Momentous: https://livemomentous.com/galpin

LMNT: https://drinklmnt.com/perform

David: https://davidprotein.com/perform

Chapters

(00:00:00) Core Tenets of Nutrition

(00:00:09) Audience Q&A, 5 Question Categories

(00:03:57) The 90%; Food Quality & Whole Foods

(00:07:12) Caloric Balance, Under- vs Over-Fueling

(00:08:53) Protein Priority; Carbohydrate & Fat Balance

(00:10:46) Fiber, Soluble vs Insoluble; Daily Target

(00:12:10) Tool: Half Your Plate Vegetables; Color Variety

(00:14:35) Raw vs Cooked, Antioxidants vs Minerals

(00:17:00) Liquid Calories, Hidden & Intentional Use

(00:19:48) Sustainability, Meal Frequency & Timing

(00:21:13) Food Safety, Allergies & Environmental Pollutants

(00:23:15) Refueling & Hydration, 4 Elements; Carbs During Training

(00:26:13) Muscle as a Carbon Sink; Glucose Storage

(00:29:27) Amino Acids; Does Protein Timing Matter?

(00:30:54) Hydration, Tool: Half Body Weight in Ounces

(00:32:14) Tool: Galpin Equation; Electrolytes

(00:33:28) Tool: Post-Workout Rehydration, 125% Rule

(00:35:18) GI Distress, Carbs Per Hour; Training Your Gut

(00:39:17) Coaching Nutrition, Tool: Add Before Subtracting

(00:40:04) Reframing "

Perform with Dr. Andy Galpin

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