Table of Contents
What is TDEE?
TDEE stands for Total Daily Energy Expenditure. It's the total number of calories your body burns in a 24-hour period, including:
Basal Metabolic Rate (BMR)
Calories burned at complete rest - breathing, circulation, cell production
Thermic Effect of Food (TEF)
Calories burned digesting and processing food (~10% of intake)
Exercise Activity (EAT)
Calories burned through planned exercise and workouts
Non-Exercise Activity (NEAT)
Calories burned through daily activities - walking, fidgeting, etc.
TDEE = BMR × Activity Multiplier
Understanding BMR
Your Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions. This accounts for about 60-70% of your TDEE.
Mifflin-St Jeor Equation (Most Accurate)
Men: BMR = (10 × weight kg) + (6.25 × height cm) - (5 × age) + 5
Women: BMR = (10 × weight kg) + (6.25 × height cm) - (5 × age) - 161
Factors That Affect BMR:
- • Age: BMR decreases about 2% per decade after age 20
- • Muscle mass: More muscle = higher BMR
- • Body size: Larger bodies burn more calories
- • Gender: Men typically have higher BMR than women
- • Genetics: Can account for up to 10% variation
- • Hormones: Thyroid function significantly impacts BMR
Activity Level Multipliers
Your BMR is multiplied by an activity factor to estimate your TDEE. Be honest about your activity level:
Sedentary
Little or no exercise, desk job
Lightly Active
Light exercise 1-3 days/week
Moderately Active
Moderate exercise 3-5 days/week
Very Active
Hard exercise 6-7 days/week
Extremely Active
Very hard exercise, physical job
TDEE for Weight Loss
To lose weight, you need to eat fewer calories than your TDEE (caloric deficit). Here's how it works:
The Math of Weight Loss
- • 1 pound of fat ≈ 3,500 calories
- • 500 calorie daily deficit = 1 lb/week loss
- • 250 calorie daily deficit = 0.5 lb/week loss
Safe Weight Loss
10-20% below TDEE (0.5-1 lb/week)
Sustainable and preserves muscle
Aggressive Weight Loss
20-25% below TDEE (1-1.5 lb/week)
May cause muscle loss, not sustainable
Warning: Never eat below 1,200 calories (women) or 1,500 calories (men) without medical supervision.
TDEE for Muscle Gain
To build muscle, you need a caloric surplus combined with resistance training:
Bulking Guidelines
- • Lean Bulk: TDEE + 200-300 calories (minimize fat gain)
- • Standard Bulk: TDEE + 300-500 calories (balanced approach)
- • Aggressive Bulk: TDEE + 500+ calories (faster gains, more fat)
Protein Requirements for Muscle Gain
Consume 0.7-1g of protein per pound of body weight (1.6-2.2g per kg) to support muscle growth.
Adjusting Your TDEE
TDEE calculators provide estimates. Here's how to fine-tune your numbers:
The 2-Week Test
- 1. Calculate your estimated TDEE
- 2. Track your calories accurately for 2 weeks
- 3. Weigh yourself daily, calculate weekly average
- 4. Compare week 1 and week 2 averages
- 5. Adjust based on results:
• Weight stable = TDEE is accurate
• Lost weight = Actual TDEE is higher
• Gained weight = Actual TDEE is lower
Adjust your calories by 100-200 per day based on your results and retest.
Common Mistakes to Avoid
Overestimating Activity Level
Most people aren't as active as they think. When in doubt, choose one level lower.
Not Tracking Accurately
Use a food scale. "Eyeballing" portions can be off by 20-50%.
Forgetting Liquid Calories
Coffee drinks, alcohol, and juices add up quickly.
Eating Back Exercise Calories
Fitness trackers overestimate calories burned. Only eat back 50% if needed.
Drastic Calorie Cuts
Extreme deficits slow metabolism and cause muscle loss. Be patient.
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