What "cutting" and "bulking" actually mean
Cutting means eating in a calorie deficit — less than your body burns — so it draws on stored fat for energy, with the goal of losing fat while keeping as much muscle as possible. Bulking means eating in a calorie surplus, giving your body the extra energy it needs to build new muscle tissue, usually alongside some unavoidable fat gain.
Neither one is inherently better — they are tools for different starting points and goals. The mistake is picking one because it's popular rather than because it fits where you actually are right now.
Signs you should be cutting
- You are carrying more body fat than you're comfortable with, and it affects how your clothes fit or how you feel day to day
- You cannot see visible muscle definition even in muscle groups you've trained consistently for months
- Your primary goal right now is to look leaner rather than to add size
A cut still needs enough protein and enough training volume to signal your body to hold onto muscle — a deficit with no training or protein just loses weight, not fat specifically, and a meaningful share of that weight will be muscle.
Signs you should be bulking
- You are already lean, or your main goal is to add visible size and strength rather than to look leaner
- You have been "cutting" or under-eating for a long stretch and your training numbers have stopped moving despite consistent effort
- You are a beginner or returning after a long break — your body responds fastest to extra calories and training stimulus at this stage
A bulk does not require eating without limit. An uncontrolled surplus mostly adds fat once your body's capacity to build new muscle in a given week is used up, which has a ceiling even for a beginner.
How big the deficit or surplus should be
| Goal | Typical adjustment | Why |
|---|---|---|
| Cutting | 15–20% below maintenance | Meaningful fat loss while limiting muscle loss and hunger |
| Bulking | 10–15% above maintenance | Enough surplus to build muscle without excess fat gain |
| Maintenance / recomposition | Within ~5% of maintenance | Body composition shifts slowly through training and protein alone |
These are starting points, not fixed rules — see the calculators guide for exactly how BMR and TDEE are calculated, which is what these percentages are applied to.
Can you do both at once? Body recomposition
Body recomposition — losing fat and building muscle in the same stretch of time — is realistic mainly for three groups: complete beginners, people returning to training after a long layoff, and people who are carrying enough excess body fat to fuel muscle growth from stored energy. For a lean, experienced lifter, the two goals compete directly for the same calories, and dedicated cut and bulk phases usually produce faster, more reliable results than trying to do both indefinitely.
FAQ
Should a beginner cut or bulk first?
A beginner with a healthy body weight and no strong preference generally benefits most from a slight surplus or maintenance calories, since it supports the fastest muscle and strength gains available to a new lifter — often called "newbie gains".
Can you build muscle and lose fat at the same time?
It is possible, mainly for beginners, people returning after a break, or those at a higher body fat percentage — this is called body recomposition. It is slower and less reliable for lean, experienced lifters, who generally see better results alternating dedicated cutting and bulking phases.
How big should a calorie deficit or surplus be?
A moderate deficit of roughly 15 to 20 percent below maintenance calories, or a surplus of roughly 10 to 15 percent above it, is sustainable for most people and preserves more muscle during a cut or limits fat gain during a bulk than more extreme numbers.