How to run a structured cut.

What a "structured" cut means

Most people who say they're "cutting" are doing one of two things: a vague reduce-portions-and-hope plan that produces inconsistent results, or a crash diet that loses weight fast but takes muscle with it. A structured cut is neither. It's:

• A planned deficit — a specific calorie target derived from your TDEE, not "eating less"
• A planned duration — usually 8-16 weeks, with a defined end
• A planned macro split — protein-first, with carbs and fat distributed to fuel training
• A planned training response — same intensity, possibly less volume, never abandon the lifts
• A planned exit — how you'll transition back to maintenance without rebounding

The structure isn't fussiness. It's what separates a cut you finish leaner from a cut you finish smaller.

How to size your deficit

The single biggest variable in a cut's outcome. Too small and you'll quit before seeing results. Too big and you'll lose lean mass alongside the fat.

The starting number

Most lifters do best at a 15-25% deficit from TDEE. For an 80kg lifter with a 2,800 kcal TDEE, that's roughly 2,100-2,400 kcal/day.

Translated into weekly weight loss, that's about 0.5-1% of bodyweight per week. For an 80kg lifter, that's 400-800g per week.

Leaner lifters need shallower deficits because there's less fat available to mobilise. Going aggressive at low body fat is how you wreck your training quality and lose muscle.

Why deeper deficits backfire

It's tempting to push to a 30-40% deficit for faster results. Don't. The research is clear on what happens above ~25%:

• Muscle loss accelerates disproportionately
• Strength drops, sometimes dramatically
• Hunger spikes, adherence cracks, rebound eating becomes near-certain
• Recovery from training collapses
• Sleep quality degrades

Slow and structured beats fast and broken every single time over a 6-month window.

Macros for a cut

Protein — the priority macro

1.8 to 2.4g per kilogram bodyweight per day. Higher than during bulking or recomp because protein is what protects lean mass when calories are tight. Distribute across 3-5 meals so muscle protein synthesis stays stimulated throughout the day.

For an 80kg lifter at the high end: 80 × 2.4 = 192g protein/day, or about 38g per meal across 5 meals.

Carbs — fuel training

After protein is set, carbs do most of the work of fueling training and supporting recovery. Aim for 3-5g per kg bodyweight on training days, 1.5-2g/kg on rest days. Time most carbs around training sessions.

Cutting carbs aggressively (under 100g/day) makes training feel terrible and undermines the whole effort. Low-carb diets work for fat loss but cost you lifts; for lifters with strength goals, moderate carb is the sweet spot.

Fat — what's left

Whatever's left after protein and carbs hit their targets. Don't go below 0.5g/kg/day — hormones suffer below that. For most lifters this lands around 50-80g/day during a cut.

Fibre and micronutrients

Often neglected during cuts. Aim for 30-40g fibre/day for satiety and gut health. A daily multivitamin and adequate sodium (3-4g/day for active lifters) help offset the natural reductions that come with eating less.

Training during a cut

This is where most cuts fail. People treat a cut as license to "switch to fat loss mode" — circuit training, high reps, sweat-focused workouts. That's how you guarantee muscle loss alongside the fat.

The principle: same lifts, same intensity

The most powerful signal you can send to your body to preserve muscle in a deficit is "we still need this muscle, we're still using it heavy." That means:

• Squats, deadlifts, presses, rows stay in the programme at the same loads
• Rep ranges stay productive (5-12 reps for most working sets)
• Most working sets land at 1-3 reps in reserve, not "circuit pace"
• Rest periods stay long enough for genuine recovery between sets (2-4 minutes for compounds)

What CAN change

• Volume. If recovery is suffering, drop weekly sets per muscle group by 10-20%. Don't drop frequency.
• Stop trying to PR. Maintenance of current loads is the win, not new personal records. If a load you used to hit goes down 5-10%, that's expected and recoverable post-cut.
• Deload more often. Every 4-6 weeks instead of every 6-8. Recovery margin is thinner.

Cardio: a tool, not the strategy

Most lifters benefit from 2-4 hours of low-intensity cardio per week during a cut — usually walking. It widens the deficit without forcing aggressive food cuts and improves adherence.

Recovery during a cut

• Sleep 7-9 hours. The single biggest non-food lever. Under 7 hours during a cut blunts muscle protein synthesis, raises cortisol, and amplifies hunger.
• Manage stress. Cuts are a stressor; piling work/life stress on top accelerates muscle loss and undermines adherence.
• Don't add cardio to "burn off" a bad-food day. Compensatory exercise leads to a worse relationship with both food and training. Move on; the trend smooths it.
• Take a deload week every 4-6 weeks. Volume drops 30-50%; calorie target stays the same.

How to measure progress

The scale during a cut is more informative than during a recomp — but it's still noisy day-to-day. Trust the trend, not the number.

1. 7-day trend weight. Daily weigh-ins averaged over the last 7 days. Drops smoother than daily readings.
2. Progress photos every 2 weeks. Same lighting, same time of day, same poses.
3. Waist circumference weekly. Useful when the scale is being noisy due to water; waist will keep shrinking even when the scale stalls.
4. Strength on key lifts. Maintaining strength = maintaining muscle. Watch for sustained drops (3+ sessions in a row), which is a signal to add calories or deload.
5. Energy and mood. A bit lower is normal; cratered is a signal to ease up.

Timeline and diet breaks

A cut should have a defined window. The body adapts to deficits — metabolism downregulates, NEAT (non-exercise movement) drops, hunger rises. Open-ended cuts run into these adaptations and produce diminishing returns.

The diet break

Every 8-12 weeks of cutting, eat at maintenance for 1-2 weeks. Calories go up to TDEE; macros stay protein-led; training stays the same. The diet break:

• Restores metabolism partially (NEAT bounces back, leptin rises)
• Resets adherence — hunger drops, mood improves
• Lets you assess actual fat loss without the noise of an active deficit

You don't lose ground during a 1-2 week break — bodyweight might tick up slightly from water/glycogen, but fat-mass stays put.

How to end a cut without rebounding

The end of the cut is where most lifters undo the work. The pattern: hit goal, immediately revert to pre-cut eating (or more), bodyweight rebounds, fat regain happens in weeks, and the cycle restarts in 6 months.

The cleaner exit:

1. Bump calories back to maintenance gradually. Add 100-200 kcal/day per week for 3-4 weeks until you're at maintenance.
2. Keep tracking for at least 2-4 weeks post-cut. This catches drift before it becomes a problem.
3. Decide your next phase explicitly. Maintain at the new bodyweight, switch to recomp, or start a slow lean bulk. Don't drift.
4. Protein stays high. Don't drop protein when calories go up — the high-protein habit is what protected your muscle and continues to support body composition.

Common cut mistakes

1. Deficit too aggressive. 25%+ deficits look fast on the scale but cost muscle.
2. Protein too low. Under 1.8g/kg = unprotected lean mass during the deficit.
3. Dropping training intensity. "Switching to fat-loss workouts" = guaranteed muscle loss.
4. Trusting the daily scale. Trend weight only.
5. Adding cardio as the strategy. Use it to widen the deficit, not as the primary lever. Diet does the work; cardio supports.
6. Skipping diet breaks. Open-ended cuts hit diminishing returns; planned breaks restore both metabolism and adherence.
7. Rebound at the end. Reverse out slowly; don't go from -500 kcal to +500 kcal overnight.
8. No defined endpoint. "I'll cut until I'm lean" is open-ended and rarely works; pick a window or a target.

How Coachly handles cuts

Cuts are one of Coachly's first-class goals during onboarding. The specific mechanics:

• Cut as a selected goal with a target weight or target body-fat range. The algorithm sets the deficit at the appropriate %, not the same flat number for every user.
• Calorie targets shift by training day. Heavy training day = slightly more fuel within the overall weekly deficit. Rest day = the deepest cut.
• Protein targets land in the 1.8-2.4g/kg range automatically based on your bodyweight and goal. You don't need to compute the math.
• Programme deloads when sleep tanks. Cuts amplify the cost of poor sleep; Coachly reads Apple Watch sleep + HRV and softens next week's intensity automatically.
• Adaptive macro adjustments based on actual weight trend, not a single weigh-in. If you're losing too fast, calories tick up. Too slow, they tick down.
• Weekly AI coach review looks at training, food, sleep, and weight together — and tells you whether to push, hold, take a diet break, or end the cut.

Quick references

Sources cited or relied on in this guide:

• Mifflin-St Jeor BMR equation: Mifflin et al., AJCN 1990 (PubMed 2305711)
• Frankenfield activity factors: Frankenfield et al., JADA 2005 (PubMed 15883556)
• ISSN protein position stand (Jäger et al. 2017) — 1.8-2.4g/kg/day during energy restriction for resistance-trained individuals
• NHS UK weight-loss safe-rate guidance (0.5-1kg/week target)

This is general nutrition and training guidance, not medical advice. If you have underlying health conditions, are pregnant or postpartum, or have a history of disordered eating, work with a qualified clinician before starting any calorie deficit.