# Bulking and cutting
Bulking and cutting is the practice of alternating between a caloric-surplus phase (bulking), with particular focus on protein consumption, and a caloric-restriction phase (cutting), with the dual purpose of optimizing lean muscle mass and reducing adiposity.[1](https://link.springer.com/article/10.1007/s40519-022-01470-y) The cycle is used by competitive bodybuilders, and also by general gym populations: in a national Canadian sample, 48.9% of men, 21.2% of women, and 21.9% of transgender and gender non-conforming participants reported bulk-and-cut cycles in the previous 12 months.[1](https://link.springer.com/article/10.1007/s40519-022-01470-y) The intended result is a net gain of muscle with little residual fat, though in practice bulking adds fat as well as muscle, and cutting then costs some of the strength gained during the bulk.[2](https://www.bbc.co.uk/food/articles/cx2v4qe91wdo) [Engagement](https://www.edgepedia.org/engagement) in the cycles is also associated with stronger drive for muscularity and, among men and women, with more severe eating disorder and [muscle dysmorphia](https://www.edgepedia.org/muscle-dysmorphia) psychopathology.[1](https://link.springer.com/article/10.1007/s40519-022-01470-y)
| Fact | Figure |
|---|---|
| Common bulking surplus | 200–500 kcal/day[3](https://health.clevelandclinic.org/bulking-vs-cutting); "conservative" evidence-based starting point 359–478 kcal/day[4](https://www.strongerbyscience.com/bulking/) |
| Recommended cut rate | 0.5–1% of body weight per week[5](https://journals.lww.com/nsca-jscr/fulltext/2021/09000/dietary_strategies_of_modern_bodybuilders_during.28.aspx) |
| Protein during a cut | 1.2–1.7 g/kg/day for bodybuilders[6](https://www.mdpi.com/2072-6643/17/7/1265); 2.3–3.1 g/kg fat-free mass for lean trained dieters[7](https://cdr.lib.unc.edu/downloads/76537351w?locale=en) |
| Bulk duration | Four to eight months in common practice[3](https://health.clevelandclinic.org/bulking-vs-cutting); 1 to over 6 months depending on goals[8](https://www.healthline.com/nutrition/bulking-vs-cutting) |
| Cut duration | Roughly six weeks to four months[3](https://health.clevelandclinic.org/bulking-vs-cutting) |
| Contest-prep timeline | Bulk until 12–16 weeks out; cutting in the last ~2 months[5](https://journals.lww.com/nsca-jscr/fulltext/2021/09000/dietary_strategies_of_modern_bodybuilders_during.28.aspx) |
| Prevalence (past 12 months) | 48.9% of men, 21.2% of women, 21.9% of TGNC adults in a Canadian national sample[1](https://link.springer.com/article/10.1007/s40519-022-01470-y) |
## How the cycle works
Bulking means eating more calories than needed so that resistance training can build as much muscle as possible over a set period.[2](https://www.bbc.co.uk/food/articles/cx2v4qe91wdo) The surplus supports anabolic processes and the increasing demands of training; position-stand guidance holds that diets aimed at lean-mass gain are likely optimized by a sustained caloric surplus.[7](https://cdr.lib.unc.edu/downloads/76537351w?locale=en) The surplus cannot be directed entirely to muscle: gains include fat as well as muscle, which is why a cutting phase follows.[2](https://www.bbc.co.uk/food/articles/cx2v4qe91wdo)
The cutting phase reverses the energy balance to strip the added fat, but calorie restriction also slows muscle development. That slowdown is typically what motivates a return to bulking, which can perpetuate a maladaptive cycle.[1](https://link.springer.com/article/10.1007/s40519-022-01470-y) Excessive deficits carry their own costs: fatigue, poor recovery and sleep, and loss of muscle mass.[3](https://health.clevelandclinic.org/bulking-vs-cutting)
## By the numbers
Surplus sizing is the point where popular and evidence-based recommendations diverge. The [Cleveland Clinic](https://www.edgepedia.org/cleveland-clinic) puts a typical bulk at a surplus of 200 to 500 calories per day.[3](https://health.clevelandclinic.org/bulking-vs-cutting) Slater and colleagues, cited in a detailed evidence review, recommend a "conservative" starting surplus of 1500–2000 kJ/day (359–478 kcal/day), while acknowledging that no precise evidence-based target exists.[4](https://www.strongerbyscience.com/bulking/)
Deficit sizing in a structured protocol can be modest. In a 24-week pilot trial, the cutting phase began with a 200 kcal/day reduction from bulking intake, adjusted weekly in 200 kcal increments to target a loss of ½ pound (about 0.23 kg) per week, on a diet of 25–30% protein, 55–60% carbohydrate, and 15–20% fat.[6](https://www.mdpi.com/2072-6643/17/7/1265)
Cut rates are usually expressed relative to body weight: a recommended weekly loss of 0.5–1% of body mass, with slower loss better preserving fat-free mass.[5](https://journals.lww.com/nsca-jscr/fulltext/2021/09000/dietary_strategies_of_modern_bodybuilders_during.28.aspx) Men's Physique competitors in that research lost 0.93% per week, within the recommendation.[5](https://journals.lww.com/nsca-jscr/fulltext/2021/09000/dietary_strategies_of_modern_bodybuilders_during.28.aspx) Health guidance similarly targets about 1 lb (0.45 kg) or 0.5–1% of body weight per week.[9](https://www.healthline.com/nutrition/cutting-diet)
Protein recommendations depend on training status and leanness. Competitive bodybuilders are advised to take 1.2–1.7 g/kg/day.[6](https://www.mdpi.com/2072-6643/17/7/1265) For lean, resistance-trained subjects in a caloric deficit, higher intakes of 2.3–3.1 g/kg of fat-free mass may be required to maximize muscle retention.[7](https://cdr.lib.unc.edu/downloads/76537351w?locale=en) Above roughly 1.6 g/kg/day, additional protein does not increase muscle mass in untrained and overweight individuals.[6](https://www.mdpi.com/2072-6643/17/7/1265)
Phase durations in practice: bulking commonly lasts four to eight months, especially for first-timers, and cutting phases run shorter, roughly six weeks to about four months.[3](https://health.clevelandclinic.org/bulking-vs-cutting) Other guidance puts a bulk anywhere from one month to over six months and a cut at two to four months, with the two alternated in cycles.[8](https://www.healthline.com/nutrition/bulking-vs-cutting) No source in the evidence base establishes an optimal duration or switching frequency.
## Lean bulking versus dirty bulking
Bulking styles sit on a spectrum defined largely by food quality. Dirty bulking, built on fried and processed foods, adds more fat mass and makes the subsequent cut harder; high-quality calories are preferred.[3](https://health.clevelandclinic.org/bulking-vs-cutting) A coaching guide estimates that a typical bulk produces about 1–2 pounds of fat gain per month, while a typical cut runs at 1–2 pounds of fat loss per week, working out to roughly one month of cutting for every two to four months of bulking.[10](https://macrosinc.net/blog/the-complete-guide-to-bulking-and-cutting/) These fat-gain figures come from a coaching source rather than controlled research, so they should be read as practical rules of thumb.
## Cutting without losing muscle
How aggressively a deficit can be imposed depends on baseline body fat: the higher the starting fat mass, the more aggressive the deficit may be, while leaner subjects preserve lean mass better with slower rates of weight loss.[7](https://cdr.lib.unc.edu/downloads/76537351w?locale=en) In Garthe and colleagues' comparison, a weekly loss of 0.7% of body weight outperformed 1.4% for lean-mass preservation, and Helms and colleagues suggested 0.5–1.0% weekly for contest-prep bodybuilders.[7](https://cdr.lib.unc.edu/downloads/76537351w?locale=en)
Two levers protect muscle during a cut: protein intake, scaled to leanness and training status as above,[6](https://www.mdpi.com/2072-6643/17/7/1265) • [7](https://cdr.lib.unc.edu/downloads/76537351w?locale=en) and avoiding deficits large enough to cause fatigue, poor recovery, and muscle loss.[3](https://health.clevelandclinic.org/bulking-vs-cutting)
## How it compares with body recomposition
Body recomposition, gaining muscle while losing fat in the same period, sits at the alternative end of the same energy-balance spectrum. A meta-regression found recomposition is quite common in calorie deficits up to around 200–300 kcal/day, but pretty atypical in deficits larger than 500 kcal/day.[4](https://www.strongerbyscience.com/bulking/) Recomposition is more likely in people with higher adiposity, less training experience, and greater distance from their genetic muscularity limit.[4](https://www.strongerbyscience.com/bulking/) As the energy deficit grows, the magnitude of hypertrophy increasingly tends to get blunted, so a sustained surplus still appears advantageous for maximizing hypertrophy.[4](https://www.strongerbyscience.com/bulking/) • [7](https://cdr.lib.unc.edu/downloads/76537351w?locale=en)
## Recent developments
Direct trial evidence on the practice barely existed until recently. A 2025 pilot study put seven untrained middle-aged men with obesity through a 24-week protocol of 12 weeks of bulking followed by 12 weeks of cutting, combined with resistance training; retention was 64%, training compliance 96.7%, and dietary adherence over 93%.[6](https://www.mdpi.com/2072-6643/17/7/1265) Over the 24 weeks, fat-free mass increased about 3% and body fat percentage fell about 6% (p < 0.05), while deadlift strength rose 46% and squat 65% (p < 0.001).[6](https://www.mdpi.com/2072-6643/17/7/1265) TNF-α concentrations, a marker of inflammation, were 15% lower at week 24 than baseline, though lipids, CRP, IL-6, and IL-10 did not change significantly.[6](https://www.mdpi.com/2072-6643/17/7/1265) The study is small and uncontrolled, but it is a first direct test showing a structured bulk-and-cut protocol is feasible and improved body composition, strength, and inflammation in this population.
## References
1. ['Bulking and cutting' among a national sample of Canadian adolescents and young adults](https://link.springer.com/article/10.1007/s40519-022-01470-y)
2. [Bulking and cutting: Does this fitness trend really work?](https://www.bbc.co.uk/food/articles/cx2v4qe91wdo)
3. [Bulking vs. Cutting: What Should You Do?](https://health.clevelandclinic.org/bulking-vs-cutting)
4. [Optimizing Bulking Diets To Facilitate Hypertrophy](https://www.strongerbyscience.com/bulking/)
5. [Dietary Strategies of Modern Bodybuilders During Different Phases of the Competitive Cycle](https://journals.lww.com/nsca-jscr/fulltext/2021/09000/dietary_strategies_of_modern_bodybuilders_during.28.aspx)
6. [A Pilot 24-Week 'Bulk and Cut' Dietary Protocol Combined with Resistance Training Is Feasible and Improves Body Composition and TNF-α Concentrations in Untrained Adult Males](https://www.mdpi.com/2072-6643/17/7/1265)
7. [International Society of Sports Nutrition Position Stand: Diets and Body Composition](https://cdr.lib.unc.edu/downloads/76537351w?locale=en)
8. [Bulking vs. Cutting: Pros, Cons, and Comparison](https://www.healthline.com/nutrition/bulking-vs-cutting)
9. [How to Follow a Cutting Diet for Weight Loss](https://www.healthline.com/nutrition/cutting-diet)
10. [The Complete Guide to Bulking and Cutting](https://macrosinc.net/blog/the-complete-guide-to-bulking-and-cutting/)
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*Topic: Encyclopedia › Life and health › Human health and medicine › Nutrition and personal wellbeing › Dietary patterns and wellness practices › Dietary patterns and dieting › Sports and performance dietary patterns*
*Initially written Sep 17, 2026 · Edited: Oct 11, 2026; Oct 15, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license