Your Fat Loss Sprint Planner
10 lbs on a slow diet: 10–15 weeks. On the sprint: 3–4 weeks. Same science. Different timeline.
The honest answer depends on your protein, your deficit, and whether you have a finish line. Here's the maths.
Your Fat Loss Sprint Planner
The honest answer depends on your protein, your deficit, and whether you have a finish line. Here's the maths.
| Approach | Deficit Depth | Timeline to 10 lbs |
|---|---|---|
| Standard calorie counting (CICO) | 300–500 kcal/day | 10–20 weeks |
| Intermittent fasting | 300–600 kcal/day | 8–15 weeks |
| Keto (if in deficit) | 500–800 kcal/day | 7–12 weeks |
| Fat Loss Sprint (Sprint Level 1–2) | 1,000–1,800 kcal/day | **3–4 weeks** |
Note: Week 1 always includes 1–3 kg of water and glycogen — real, visible, expected. From week 2, loss is predominantly fat.
The rate of fat loss is determined by the size of the caloric deficit — and the size of the deficit that can be maintained without losing muscle or crashing.
Most approaches keep the deficit moderate to avoid muscle loss and metabolic adaptation. The Fat Loss Sprint creates a larger deficit safely by:
1. Setting protein at 2.2–3.0 g/kg LBM — the primary variable for lean mass preservation 2. Requiring twice-weekly resistance training — the mechanical stimulus that protects muscle 3. Scheduling refeeds — preventing leptin crash and managing metabolic adaptation 4. Mandating a post-sprint recovery — preventing the crash-and-rebound pattern
These four elements are what allow the FLS to run a larger deficit without the consequences that make "crash dieting" legitimately dangerous.
Purcell et al. (2014): A 12.5% weight loss target (equivalent to 10–15 kg for a typical adult) was achieved by 81% of rapid protocol users in 12 weeks — vs. 50% of gradual users in 36 weeks.
Palgi et al. (1985): Mean weight loss of 18.6 kg (41 lbs) in 668 patients over 17 weeks on a supervised PSMF — a rate of approximately 1.1 kg per week, consistent with Sprint Level 2 expectations.
The Protocol
Your macros, protein target, and sprint length aren't guesses — they're set by the Fat Loss Sprint, a protocol built on 50+ years of clinical research. See how it works, and how it compares to every other diet.
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