How to Calculate Your Real Calorie Deficit
Most calorie apps lie to you. They use generic formulas that don't account for your metabolic adaptation or true activity levels. If you want to lose weight sustainably, you need to understand the math behind your metabolism.
Understanding TDEE (Total Daily Energy Expenditure)
Your TDEE is the total number of calories you burn in a day. It is composed of four main parts:
- BMR (Basal Metabolic Rate): Calories burned at rest.
- TEF (Thermic Effect of Food): Calories burned digesting food.
- EAT (Exercise Activity Thermogenesis): Calories burned during intentional exercise.
- NEAT (Non-Exercise Activity Thermogenesis): Calories burned doing everything else (walking, fidgeting, working).
The Deficit Math
To lose weight, you must consume fewer calories than your TDEE. A common target is a 500-calorie daily deficit, which theoretically leads to 0.5kg (1lb) of weight loss per week.
However, your body is smart. As you lose weight, your BMR drops. This is why "plateaus" happen.
How to Calculate It Properly
The most accurate formula for most people is the Mifflin-St Jeor equation. You calculate your BMR first, then multiply it by an activity factor.
If you want to skip the manual math, use our BMI Calculator to get started on your health journey.
Conclusion
Sustainability is key. A massive deficit might work for a week, but a moderate, calculated deficit works for a lifetime.