What Is a Cut?
A "cut" is a deliberate phase of caloric restriction designed to reduce body fat while preserving lean muscle mass. The term comes from bodybuilding, where athletes alternate between "bulk" phases (building muscle in a calorie surplus) and "cut" phases (losing fat in a calorie deficit).
The fundamental mechanism is simple: eat fewer calories than you burn, and your body turns to stored energy (primarily fat) to make up the difference. A deficit of approximately 3,500 calories produces roughly 1 pound of fat loss. At 500 calories per day below maintenance, that's about 1 pound lost per week.
What separates a successful cut from simply "starving yourself" is the combination of a moderate deficit, high protein intake, and continued resistance training — all of which work together to ensure the weight you lose comes predominantly from fat, not muscle.
Who Should Cut? (Starting Body Fat Targets)
Not everyone needs to be in a dedicated cut at any given time. General guidelines from sports nutrition research suggest:
Men
- Above ~18–20% body fat: Cut first before bulking. At higher body fat, insulin sensitivity is reduced, making bulking less efficient and fat gain more likely.
- 12–15% body fat: Good starting point for a bulk. You have enough "room" to gain some fat during a surplus before needing to cut again.
- Below 10%: Likely in or finishing a cut. Transitioning to maintenance or a lean bulk is usually appropriate.
Women
- Above ~28–30% body fat: Cut first. Women naturally carry more essential fat than men (required for hormonal health), so absolute thresholds are approximately 8–10% higher.
- 20–25% body fat: Good starting point for a bulk.
- Below 18%: Likely in or finishing a cut. Extended time below 18% can affect hormonal health in women — transition to maintenance after reaching goal.
These are guidelines, not rules. Your individual goal, training experience, and how you feel matter equally. Use the body fat calculator to estimate your current body fat percentage.
How to Set Up Your Cut
Step 1: Calculate Your TDEE
Your starting point is your TDEE (Total Daily Energy Expenditure) — the total calories you burn each day. Use the TDEE calculator to find this number based on your weight, height, age, sex, and activity level.
Step 2: Set Your Calorie Deficit
A deficit of 500 calories per day (TDEE minus 500) targets approximately 1 lb of fat loss per week — the standard recommendation for muscle preservation. More aggressive options:
Step 3: Set High Protein
During a cut, protein is your most important macro. Research supports 1.0–1.2g of protein per pound of bodyweight (2.2–2.6g/kg) when in a calorie deficit. This is higher than the maintenance recommendation because restricted calories create a catabolic environment where muscle is at risk of being used for energy. High protein intake is the primary defense against muscle loss on a cut.
Step 4: Set Fat and Carbs
After protein is set, fat should be at least 20% of total calories (for testosterone and hormone maintenance). Remaining calories go to carbohydrates, which fuel your training sessions. Many people on a cut prefer to reduce carbs rather than fat, but neither is universally superior — choose the approach you can adhere to.
Calculate Your Cutting Macros
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Calculate Cutting Macros →How Long Should You Cut?
Cut duration depends on how much fat you want to lose, your starting body fat, and your psychological tolerance for sustained restriction. General guidelines:
- Minimum effective cut: 8 weeks. Anything shorter rarely produces meaningful, lasting changes in body composition and doesn't allow time to adapt to and assess your deficit.
- Typical cut: 12–16 weeks. Most people can sustain a moderate deficit for 12–16 weeks before significant metabolic adaptation and diet fatigue set in.
- Maximum recommended cut: 20–24 weeks. Beyond this, metabolic adaptation becomes severe, hormonal disruption accumulates, and the psychological burden of sustained restriction makes adherence very difficult.
At 0.5–1% body weight loss per week (the optimal rate for muscle preservation), a 180 lb person can expect to lose 0.9–1.8 lbs per week. Over 16 weeks, that's 14–28 lbs of body weight — mostly fat with minimal muscle loss if protein and training are dialed in.
Minimum Calories on a Cut
There is a floor below which cutting calories becomes counterproductive. Eating too few calories accelerates muscle loss, impairs recovery, disrupts hormones (testosterone, thyroid, leptin), and makes you miserable enough that the diet collapses.
Going below this risks muscle loss, nutrient deficiencies, and metabolic adaptation regardless of body weight
Absolute floor — most active women should remain well above this to support training and hormonal health
If these minimums conflict with achieving a desired rate of fat loss, the correct solution is to extend the cut duration at a smaller deficit — not to drop below minimum calories. A 250-calorie deficit over 24 weeks produces the same total fat loss as a 500-calorie deficit over 12 weeks, with less muscle loss and better adherence.
How to Train on a Cut
Training strategy on a cut is one of the most misunderstood aspects of fat loss. The common mistake is switching to lighter weights and higher reps ("toning") to "burn more fat." This is not how muscle preservation works.
Keep lifting heavy. The primary signal telling your body to maintain muscle tissue is the mechanical tension from resistance training. If you stop providing that signal — by dropping weights, reducing intensity, or switching entirely to cardio — your body has no reason to maintain metabolically expensive muscle tissue while in a calorie deficit. It will preferentially burn muscle alongside fat.
What you can adjust on a cut:
- Reduce total training volume by 10–20% if recovery is suffering (fewer sets per session, not fewer sessions)
- Maintain or reduce load — do not intentionally reduce weights unless forced to
- Add moderate cardio (2–3 sessions/week of 20–30 minutes) for additional calorie burn if needed — but this is supplementary, not the primary driver
If you can maintain the weights you were lifting at the start of your cut throughout the cut, that is an excellent sign that muscle mass is being preserved.
Diet Breaks and Refeeds
Extended cutting phases cause hormonal adaptations — reduced leptin, suppressed thyroid output, lower testosterone — that slow fat loss and increase hunger. Two tools can help manage this:
Refeed Days
A refeed is 1–2 days per week where you eat at or slightly above maintenance calories, primarily through increased carbohydrate intake. Refeeds temporarily restore glycogen stores, provide psychological relief from restriction, and may partially restore leptin levels. They are most useful for people cutting aggressively or for extended periods.
Diet Breaks
A diet break is 1–2 weeks eating at maintenance calories after every 6–8 weeks of cutting. Research from the MATADOR study (2017) found that intermittent energy restriction (2 weeks cut, 2 weeks maintenance) produced significantly more fat loss and less muscle loss than continuous restriction over the same period. The breaks allow metabolic and hormonal recovery that makes the next cutting phase more effective.
Diet breaks are not "cheating" or giving up — they're a strategic tool that makes your overall cut more efficient and sustainable.
Protein Timing on a Cut
While total daily protein intake matters most, spreading protein across multiple meals enhances muscle protein synthesis compared to eating the same amount in fewer, larger meals. Research suggests that consuming 20–40g of high-quality protein every 3–5 hours maximally stimulates muscle protein synthesis throughout the day.
Practical application on a cut: aim for 4–5 meals or eating occasions per day, each containing a meaningful protein source. This also helps manage hunger — protein is the most satiating macro and spreading it throughout the day prevents the large hunger spikes that lead to diet breaks.
Don't skip meals to "save" calories for later. Skipping a meal eliminates a muscle protein synthesis stimulus and typically results in larger, less controlled eating later.
Common Cutting Mistakes
Cutting too aggressively
Deficits larger than 750–1,000 calories accelerate muscle loss, crash hormones, and are psychologically unsustainable. The scale drops fast initially (mostly water and glycogen), but muscle loss follows. Slower deficits produce better body composition outcomes.
Cutting protein to save calories
The worst trade you can make. Protein is the most satiating macro and the primary defender of muscle tissue during a deficit. Cutting protein to add carbs or fat is a reliable way to lose muscle alongside fat, resulting in a smaller but not leaner physique.
Abandoning heavy lifting
Switching from resistance training to only cardio during a cut removes the muscle-preserving stimulus. The result is significant muscle loss. Keep lifting heavy throughout your cut — it's the number-one tool for maintaining muscle while in a deficit.
Cutting for too long without a break
Continuous cutting beyond 20 weeks typically hits diminishing returns as metabolic adaptation reduces the effective deficit to near zero. Building in planned maintenance breaks every 8–12 weeks resets the hormonal environment and makes subsequent cutting phases more effective.
Jumping straight from a cut to an aggressive bulk
After a cut, your hormonal environment is suppressed and your body is primed for fat gain (low leptin, high ghrelin). Jumping immediately into a large calorie surplus often results in rapid fat regain. Transition through 2–4 weeks at maintenance calories first, then move to a lean bulk surplus.
Measuring Progress During a Cut
Body weight fluctuates 1–4 lbs daily due to water retention, sodium intake, glycogen levels, and gut contents. Never assess progress based on a single day's weight. Instead:
- Weekly averages: Weigh yourself every morning under the same conditions (post-toilet, pre-food) and average the 7 days. Compare weekly averages month to month.
- Body measurements: Waist, hips, chest, arms, and legs measured monthly. These often show progress when the scale stalls due to water retention.
- Progress photos: Taken monthly under consistent lighting, pose, and time of day. Arguably the most motivating measure of body composition change.
- Gym performance: If you're maintaining weights in the gym, you're maintaining muscle. Performance decline is an early warning sign of excessive muscle loss.
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