A calorie deficit means you consume fewer calories than you burn. It’s the core requirement for fat loss.
Health disclaimer: informational only, not medical advice. If you have a medical condition or history of eating disorders, speak with a qualified professional.
Step 1: Estimate your maintenance calories (TDEE)
Your TDEE (total daily energy expenditure) is what you burn in a day. A practical estimate:
- Start with a calculator (BMR × activity multiplier) OR
- Use your current intake: if your weight is stable, you’re near maintenance.
Quick multiplier method (simple)
- Sedentary: bodyweight (lb) × 12
- Moderately active: bodyweight (lb) × 14
- Very active: bodyweight (lb) × 15–16
Example: 180 lb, moderately active → ~180 × 14 = 2,520 kcal/day maintenance (rough).
Step 2: Pick a deficit you can sustain
- Small deficit: 200–300 kcal/day (slow, easy)
- Moderate deficit: 300–500 kcal/day (most people)
- Aggressive deficit: 500–750 kcal/day (harder; not for everyone)
A good fat-loss rate is about 0.25–1% of body weight per week (varies by body fat, training, stress, sleep).
Step 3: Track for 14 days and adjust based on the trend
Daily weight fluctuates. Use a 7‑day average and compare week-to-week:
- If the trend is dropping: keep calories the same.
- If flat: reduce 150–250 kcal/day or increase steps/activity.
- If dropping too fast + low energy: increase 100–200 kcal/day.
Macros that make a calorie deficit easier
Protein (priority)
Aim for roughly 1.6–2.2 g/kg/day in many training contexts (adjust to your situation). Protein supports satiety and helps preserve lean mass.
Fiber + volume foods
Fruits, vegetables, legumes, potatoes, lean proteins: high volume per calorie.
Keep fats and carbs flexible
Choose the split you can stick to. Consistency beats perfection.
Common mistakes
- Overestimating activity: trackers can be optimistic.
- Not weighing portions: oils, nuts, sauces add up fast.
- All-or-nothing weekends: one weekend can wipe a weekly deficit.
Simple calculator you can use today
- Estimate maintenance (TDEE)
- Subtract 300–500 kcal
- Hit protein target
- Walk more (steps) + lift 2–4×/week
Sources (high-level): energy balance fundamentals and public health nutrition/exercise guidance (e.g., NHS/CDC/NIH principles on weight management; protein recommendations from sports nutrition consensus statements).
