Master your metabolism — from energy balance to fat loss
A seven-part framework — energy balance, BMR & TDEE, macros, fat loss, metabolic adaptation, training, and tracking. Plus free calculators: TDEE, macros, body fat, one-rep max. Learn the why, not just the what.
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The Seven-Part Framework
Follow it in order to build a complete mental model of how your body uses energy.
Energy Balance
Calories in vs. calories out — the first law of thermodynamics applied to the body, and why energy balance, not any single food, decides whether you gain or lose.
- Calories In vs. Out
- The Energy Balance Equation
- “A Calorie Is a Calorie”
- Common Myths
BMR & TDEE
The four parts of daily burn — BMR, TEF, NEAT, and exercise — how to estimate your TDEE, and why “maintenance calories” are a moving target you confirm with the scale.
- BMR / RMR
- TEF · NEAT · EAT
- Estimating TDEE
- Finding True Maintenance
Macronutrients Outline
What each macro does in the body, how much protein actually protects muscle, the truth about carbs and fat, and how to turn a calorie target into a plate.
- Protein
- Carbohydrates
- Dietary Fat
- Setting Your Macros
Calorie Deficit & Fat Loss Outline
How big a deficit to run, a realistic weekly rate, why the scale lies day to day, and how to hold on to muscle while the fat comes off.
- Sizing the Deficit
- Realistic Rate of Loss
- Scale Weight vs. Fat
- Keeping Muscle
Metabolic Adaptation Outline
Adaptive thermogenesis, the “starvation mode” myth versus what really happens, why plateaus appear, and the role of diet breaks, refeeds, and maintenance phases.
- Adaptive Thermogenesis
- The “Starvation Mode” Myth
- Why Plateaus Happen
- Diet Breaks & Refeeds
Training & Metabolism Outline
Why muscle is metabolically active, resistance training vs. cardio for fat loss, the truth about “afterburn” (EPOC), and how training protects your metabolism in a deficit.
- Muscle as Metabolic Tissue
- Resistance vs. Cardio
- EPOC / “Afterburn”
- Training in a Deficit
Measuring & Tracking Outline
How to weigh in and read the trend, the limits of BMI and body-fat methods, how to log food without obsessing, and the weekly review that drives every adjustment.
- Weighing In Right
- Body-Fat Methods
- Tracking Food
- The Weekly Review
How to use this site
Read in order, run your numbers in the calculators, then apply for 8–12 weeks.
- 1
Energy Balance
The one rule that governs body weight
- 2
Know Your Numbers
Calculate your BMR and TDEE
- 3
Build Your Plate
Set protein, carbs, and fat
- 4
Apply the Deficit
Lose fat without crashing
- 5
Adapt & Track
Beat plateaus with data
Free Calculators
Plug in your numbers — everything runs locally in your browser; nothing is uploaded.
TDEE & BMR Calculator
Enter your age, sex, height, weight, and activity to estimate your BMR and daily calorie burn (TDEE) — the starting point for any diet.
Open calculator 🍳Macro Calculator
Turn your calorie target into daily grams of protein, carbs, and fat for cutting, maintaining, or bulking.
Open calculator 📏Body Fat & BMI Calculator
Estimate BMI, body-fat percentage (US Navy method), and lean body mass from a few tape-measure inputs.
Open calculator 🏋️1RM & Running Pace Calculator
Estimate your one-rep max (1RM) from any set, and convert running pace, distance, and time.
Open calculatorThe Core Principle
Fat loss comes down to a sustained energy deficit. Macros, training, and meal timing matter only because they help you reach and hold that deficit.
Master the deficit first; optimize the details second.