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How Many Calories Should I Eat During Intermittent Fasting? (Complete Guide)

📅 Aug 28, 2026 ⏱️ 2 min read

✨ Key Takeaways

  • Learn the best practices of intermittent fasting for optimal health.
  • Understand how to track your fasting windows effectively.
  • Discover the science-backed benefits of diet.

While intermittent fasting controls the timing of your meals, your total daily caloric intake dictates whether you lose body fat, maintain weight, or build lean muscle. To lose fat sustainably, you should consume 300 to 500 calories below your Total Daily Energy Expenditure (TDEE) during your eating window. Fasting makes maintaining this caloric deficit effortless because eating 2 meals instead of 4 naturally prevents overeating.

⚡ Caloric Target Formula

  • Step 1: Calculate your TDEE using our TDEE Calculator.
  • Step 2 (Fat Loss Target): Subtract 15–20% (approx. 300–500 kcal) from your TDEE.
  • Step 3 (Do Not Undereat): Never consume fewer calories than your Basal Metabolic Rate (BMR) for prolonged periods.
  • Step 4 (Protein Priority): Aim for 1.6–2.0g of protein per kg of body weight (calculate your macros).

Calorie Targets by Body Goal (Based on 2,000 kcal TDEE)

Goal Calorie Adjustment Daily Calories (Example) Expected Outcome
Sustainable Fat Loss −300 to −500 kcal (−20%) 1,500 – 1,700 kcal 1–2 lbs pure fat loss per week
Maintenance & Autophagy Exact TDEE 2,000 kcal Stable weight, cellular repair, longevity
Lean Muscle Building +200 to +300 kcal (+10%) 2,200 – 2,300 kcal Lean hypertrophy with minimal fat gain

Track Fasts & Hit Your Caloric Goals

Combine precision fasting timers with accurate caloric targets using FastingTracker for iOS.

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Medical References

Aly Owen - Nutritionist

Aly Owen

Certified Nutritionist & Fasting Expert

Aly Owen is a certified nutritionist and intermittent fasting expert. With over 8 years of clinical experience, she specializes in metabolic health and sustainable weight loss through fasting. Aly breaks down complex science into actionable advice.

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