You've built muscle. Now you're soft. Time to cut.
A cut is a caloric deficit aimed at reducing body fat whilst preserving muscle. The tension is real: create a large deficit to lose fat quickly, and you lose muscle. Create a small deficit to preserve muscle, and fat loss is glacially slow.
The answer isn't a compromise between the two. It's understanding the exact parameters that optimise fat loss whilst minimising muscle loss.
The Deficit Sweet Spot: 0.5–1% Bodyweight Per Week
Research suggests that a fat loss rate of 0.5–1% of bodyweight per week is where the magic happens.
For an 80kg lifter, that's 0.4–0.8kg loss per week. For a 100kg lifter, 0.5–1kg per week.
Anything slower than 0.5% is glacially slow (40 weeks to lose 20kg). Anything faster than 1% starts sacrificing muscle.
How to calculate your deficit:
First, estimate your TDEE (total daily energy expenditure):
- Sedentary job, three to four training sessions per week: bodyweight (kg) × 24
- Active job or five training sessions per week: bodyweight (kg) × 25–26
For an 80kg lifter with a sedentary job: 80 × 24 = 1,920 kcal/day TDEE.
To lose 0.5kg per week, you need a deficit of 3,500 kcal per week (since 1kg fat = ~7,700 kcal, 0.5kg = 3,850 kcal). That's 500 kcal per day deficit.
Eating 1,420 kcal daily would lose 0.5kg weekly. Eating 1,270 kcal would lose 0.75kg weekly.
Recommendation for most lifters: Aim for a 500–750 kcal daily deficit. This lands you in the 0.5–0.75kg loss weekly range. It's aggressive enough to see real progress, conservative enough to spare muscle.
Protein: 2g Per Kg Minimum (Non-Negotiable)
During a cut, protein becomes more important, not less.
Protein is your insurance policy against muscle loss. Adequate protein + resistance training + conservative deficit = muscle preservation.
Studies consistently show that 2.0–2.2g per kg bodyweight preserves muscle during a cut better than lower intakes.
For an 80kg lifter: 160–176g protein daily. For a 100kg lifter: 200–220g protein daily.
This is higher than bulking recommendations (often 1.8–2.0g/kg). The difference: you have less total calories to work with, so protein percentage increases. You need to be intentional.
Why does this matter?
When you're in a deficit, your body preferentially burns muscle for energy if protein is insufficient. Adequate protein signals "keep the muscle, we still need it." Without this signal, you lose more muscle alongside the fat.
During a cut, expect muscle loss of 0.1–0.25kg per week if you're doing everything right. With inadequate protein, this jumps to 0.4–0.6kg per week. The difference is significant.
Training: Maintain Intensity, Reduce Volume Slightly
The worst thing lifters do on a cut: they trash their training to "save energy."
They drop from five sessions to three, cut sets in half, and then wonder why they're losing muscle.
Your training stimulus is the signal telling your body "keep this muscle." Reducing stimulus invites muscle loss.
What to do instead:
Maintain intensity (load). Keep lifting heavy. If you were benching 100kg for 6 reps, keep benching 100kg for 6 reps. The weight shouldn't change significantly.
Studies show that training at high intensity (85%+ of 1RM, or RPE 8–9) preserves muscle better than moderate intensity during a cut.
Reduce volume moderately. Drop from 15–18 sets per muscle per week to 12–15 sets. This reduces overall fatigue, freeing recovery capacity for… recovery (not muscle building, but muscle preservation).
Maintain frequency. Hit each muscle 2–3 times weekly if you were doing this while bulking. Frequency helps maintain strength, which is linked to muscle preservation.
Reduce conditioning sparingly. Moderate cardio (20–30 minutes, 3–4× weekly) is fine and actually helpful—it increases deficit without crushing training recovery. Avoid excessive conditioning (90 minutes daily), which adds to recovery demands.
Example training structure during a cut:
Push/Pull/Legs split:
Push (Day 1):
- Barbell bench: 4 sets of 6–8 reps
- Incline dumbbell: 3 sets of 8–10 reps
- Lateral raises: 2 sets of 10–12 reps
- Total: 9 sets
Pull (Day 2):
- Barbell rows: 4 sets of 6–8 reps
- Pulldowns: 3 sets of 8–10 reps
- Face pulls: 2 sets of 10–12 reps
- Total: 9 sets
Legs (Day 3):
- Barbell squats: 4 sets of 6–8 reps
- Leg press: 3 sets of 8–10 reps
- Leg curls: 2 sets of 10–12 reps
- Total: 9 sets
Weekly volume: 27 sets, still a reasonable stimulus, much lower fatigue than bulking volumes.
Compare this to bulking: 30–36 sets weekly. Small drop, large benefit to recovery.
Cardio and Deficit: The Tool
Cardio doesn't build muscle, but it can help with a cut without tanking training quality.
A 30-minute moderate walk burns 150–200 kcal. Three times weekly = 450–600 kcal deficit from cardio alone. This means less dietary restriction needed.
Alternatively: no cardio, 600 kcal lower daily intake (very aggressive). Or: 20 minutes cardio three times weekly, 300 kcal lower daily intake (more moderate).
The advantage of cardio during a cut: It allows a more moderate caloric deficit (maybe 500 kcal from diet + 200 from cardio = 700 total) compared to a severe dietary restriction (900 kcal). The former preserves training quality; the latter often kills it.
Recommendation: 20–30 minutes of steady-state cardio, three to four times weekly. This is the "minimum effective dose" for fat loss without interfering with recovery.
Avoid excessive conditioning. High-intensity interval training on a cut, combined with heavy lifting, recovers poorly.
The Psychological Challenge
The hardest part of a cut isn't the calories. It's the psychology.
After six months of eating more, getting stronger, and enjoying food, suddenly eating less feels punitive. You're tired. You're grumpy. Your lifts feel weak. You want a break.
Most lifters quit here. They rebound, eat aggressively, and end up fatter than when they started.
The antidote: Expect this. Plan for it.
A 12-week cut is achievable. An 18-week cut is brutal. A six-week cut doesn't cut deeply enough. Twelve weeks splits the difference.
Twelve weeks looks like: 6kg fat loss (0.5kg weekly) if you're male and lean. More if you're fatter. You'll look noticeably better. You'll be able to sustain the discipline for that duration.
Secondary strategy: Plan a refeed day weekly—one day where you eat at maintenance (no deficit). You get a psychological break, your metabolism gets a small bump, and adherence improves.
Reverse Dieting After the Cut
This is where most lifters fail and undo their progress.
After a 12-week cut, you're lean. You're hungry. Your instinct is to eat aggressively.
If you jump from 1,800 kcal daily to 2,800 kcal, you'll gain back 4–5kg in two weeks (mostly water and glycogen, some fat).
Reverse diet instead: Add 100–150 kcal weekly to your intake. This re-feeds your system without triggering aggressive fat gain.
Example:
- Week 1–4 (end of cut): 1,800 kcal daily
- Week 5–8: 1,950 kcal daily
- Week 9–12: 2,100 kcal daily
- Week 13–16: 2,250 kcal daily
- Week 17+: 2,400 kcal daily (maintenance)
Over 16 weeks, you're gradually restoring intake. Your body adapts. Your metabolic rate adjusts upward. You gain muscle from the increased calories (especially in the presence of training stimulus and protein).
This is boring and feels slow. It's also the correct approach.
What to Realistically Expect in 12 Weeks
Fat loss: 6–8kg for someone starting at 15–20% body fat. More if you're fatter; less if you're already lean.
Muscle loss: 0.5–1.5kg (despite your efforts, some loss is inevitable). This is 10–15% of your fat loss—acceptable.
Strength loss: 5–10% on compound movements. Your lifts will drop because you're lighter and weaker. This is temporary and recovers quickly.
Body composition: You'll look visibly more muscular, defined, and aesthetic. Your six-pack will show. Veins will become prominent.
Energy: You'll feel worse mid-cut (weeks 4–8). This is normal. Push through.
Morale: You'll feel great at the beginning (honeymoon), terrible mid-cut, then great again as you approach your target body fat.
Common Mistakes
Deficit too large. A 1,500 kcal daily deficit (on an 1,800 kcal maintenance) isn't a cut; it's deprivation. You'll lose muscle, feel terrible, and quit. Stick to 500–750 kcal deficit.
Inadequate protein. Dropping to 1.2g/kg to "save calories" backfires. Protect protein; cut carbs or fat instead.
Maintaining zero activity. A sedentary cut is catabolic (burns muscle). Keep training hard. Maintain stimulus.
Excessive cardio. Three hours of cardio weekly on top of lifting is recovery-negative. 60–90 minutes total weekly is adequate.
Too long a cut. A 16–20 week cut grinds morale into dust. 10–14 weeks is ideal for most.
Rebounding aggressively. Eating 3,500 kcal after finishing a 1,800 kcal cut is guaranteed fat gain. Reverse diet gradually.
The Bottom Line
A cut is simple in principle: deficit, protein, training, consistency. The execution is harder because it requires discipline for 12 weeks.
The parameters that work: 500–750 kcal deficit daily, 2.0–2.2g protein per kg, heavy training with reduced volume, moderate cardio, and planned reverse dieting after.
This approach will get you lean without sacrificing the muscle you built. It's not fast. It's not exciting. It works.
Seb writes about training, nutrition and physique development for LiftLab. He has worked with natural and enhanced athletes across sports and aims to translate research into practical programming.