Bulking vs Cutting: Which Should You Do First?

It depends on your starting point. If you're carrying a fair amount of body fat, cut first: you'll look and feel better, and you can still build muscle while you lose fat. If you're already lean and want more size, bulk first with a small calorie surplus. Beginners can often skip the choice and do both at once.

Bulking means eating more than you burn to build muscle; cutting means eating less to lose fat. Research gives clear targets for how fast to do each without wasting effort. Here are the numbers, how to choose, and how long each phase should last.

What Is the Difference Between Bulking and Cutting?

Bulking is a phase of eating slightly more calories than you burn, so your body has the energy to build muscle. Cutting is a phase of eating fewer calories than you burn, so your body uses stored fat. Both phases keep lifting hard; what changes is your food, and the goal of each phase.

The ISSN position stand on diets and body composition describes muscle-gain diets as driven by a sustained calorie surplus and fat-loss diets as driven by a sustained deficit. It notes your training status influences how much you gain.

A third option, recomposition, means eating around maintenance or a small deficit while lifting and eating high protein, so you lose fat and gain muscle together. Our guide on how to lose fat and gain muscle covers it.

Should You Bulk or Cut First?

Use your body fat and experience to decide. If you have a lot of fat to lose, cut first; a bulk would add more fat to an already high level. If you're lean and experienced and want more muscle, bulk. If you're new to lifting or returning after a break, recomposition usually works well.

Your situation	Best first phase
Carrying a lot of body fat	Cut
Lean and experienced, want more size	Bulk
New to lifting	Recomposition, or a small bulk
Returning after a long break	Recomposition
Somewhere in the middle	Either; choose the goal you care about more

The ISSN notes that people with more body fat can handle a more aggressive deficit, while leaner people should lose weight more slowly to keep their muscle. That makes cutting first a natural fit if you have more to lose.

How Fast Should You Gain Weight When Bulking?

Slowly: about 0.25% to 0.5% of your body weight per week for beginners and intermediate lifters, from a calorie surplus of around 10% to 20%. For an 80 kg (176 lb) lifter, that's roughly 0.2 to 0.4 kg (0.4 to 0.9 lb) a week. Advanced lifters should aim lower, since they build muscle more slowly.

Those targets come from a 2019 review of off-season bodybuilding nutrition in the journal Sports. Gaining faster than this tends to add more fat than muscle, which just means a longer cut later.

The same review recommends 1.6 to 2.2 g/kg of protein a day while bulking, with moderate fat and enough carbs to fuel training. It also lists creatine monohydrate at 3 to 5 g a day as one of the supplements that may help.

How Fast Should You Lose Weight When Cutting?

About 0.5% to 1% of your body weight per week. For an 80 kg lifter, that's about 0.4 to 0.8 kg (0.9 to 1.8 lb) a week. Going faster increases the risk of losing muscle along with fat. Leaner lifters should stay toward the slower end.

That range comes from a 2014 review of natural bodybuilding contest preparation in the Journal of the International Society of Sports Nutrition, which recommended it "to maximize muscle retention." It also suggested 2.3 to 3.1 g/kg of lean body mass in protein during a cut, higher than when bulking, to help protect muscle.

Phase	Weekly rate	Protein	Key goal
Bulk	+0.25% to 0.5% of body weight	1.6 to 2.2 g/kg	Add muscle with minimal fat
Cut	−0.5% to 1% of body weight	2.3 to 3.1 g/kg of lean mass	Lose fat, keep muscle

How Long Should a Bulk or Cut Last?

There's no fixed length; it depends on how far you are from your goal. Research doesn't set a standard length, so the better rule is to stop when you reach your target or when progress stalls for several weeks. At the recommended rates, the math tells you roughly how long you need.

For example, at 0.5% of body weight a week, an 80 kg lifter loses about 0.4 kg a week, so losing 6 kg would take around 15 weeks. Bulking at 0.25% a week adds nearly 1 kg a month, so a meaningful bulk usually takes several months.

Take short breaks from dieting if you feel run down. Our guide on deload weeks covers easier training weeks, which can pair well with a diet break.

Can You Build Muscle While Cutting?

Yes, in the right conditions. In a controlled trial, young men in a steep calorie deficit gained 1.2 kg of lean mass and lost 4.8 kg of fat in four weeks while lifting hard and eating 2.4 g of protein per kg a day. It works best for people with fat to lose and less training experience.

That 2016 trial in the American Journal of Clinical Nutrition used a demanding program of resistance and interval training six days a week. Most people won't replicate that exactly, but it shows lifting and high protein can protect and even build muscle in a deficit.

Our guide on does lifting weights burn fat explains how lifting supports fat loss.

What Should You Eat When Bulking?

Mostly the same healthy foods, just more of them. Hit your protein target, add carbs around training for energy, and include healthy fats. Avoid "dirty bulking" on junk food, which adds fat quickly and makes the next cut longer. Track your weight weekly, using an average of several morning weigh-ins, and adjust portions to stay in the target range.

The 2019 review recommends spreading protein over three to six meals, at about 0.4 to 0.55 g per kg per meal. Our guide on how much protein you can absorb at once covers per-meal amounts.