How to run a mini-cut during a bulk

Twenty resistance-trained athletes ate 60 percent of their usual calories for two weeks. Half ate about 1.0 g/kg of protein and lost 1.6 kg of lean mass. The other half ate about 2.3 g/kg and lost 0.3 kg.¹ In this small trial, the higher-protein group lost less measured lean body mass during the deficit.

That trial supports one part of the mini-cut strategy, the case for higher protein during a short deficit. You run a deficit steeper than a normal cut would allow, you run it for weeks instead of months, and you protect lean mass with protein and heavy lifting. Done well, it strips the fat a bulk put on too fast and returns you to gaining from a leaner start. Done badly, it is a crash diet with a gym membership.

01The mini-cut defined

A mini-cut is a planned, short deficit placed inside a longer gaining phase. It exists because long bulks drift. The surplus creeps up, the waist follows, and 16 weeks later the lifter needs a 12-week diet to undo it. A mini-cut stops that drift at 4 to 8 lb of excess fat instead of 15.

It differs from a diet break and from a refeed day. Those raise calories inside a fat-loss phase. A mini-cut lowers calories inside a muscle-gain phase.

The durations below are planning ranges, not thresholds established by a trial comparing these approaches.

02The evidence behind short aggressive deficits

No randomized trial has tested a protocol labeled "mini-cut." The case comes from short, steep deficits in trained people, and those trials point the same direction.

Mettler's two-week trial is the closest match. Resistance-trained athletes ate 60 percent of their habitual intake. Body mass fell 3.0 kg on 1.0 g/kg of protein and 1.5 kg on 2.3 g/kg. Nearly all of the extra loss in the low-protein group was lean mass.¹ The high-protein group gave up almost nothing.

Longland ran a harder experiment. Young men ate 40 percent below maintenance for four weeks and trained six days a week with lifting and sprint intervals. The 2.4 g/kg group gained 1.2 kg of lean mass and lost 4.8 kg of fat. The 1.2 g/kg group gained 0.1 kg of lean mass and lost 3.5 kg of fat.³ These results came from young men in a high-volume training study. An advanced lifter should not assume the same lean-mass gain.

Garthe's elite athletes add a warning about rate. The group that lost about 0.7 percent of body weight per week gained 2.1 percent lean body mass. The group that lost about 1.0 percent per week held lean mass roughly flat, at -0.2 percent.⁶ The authors concluded that athletes aiming to gain lean mass during weight loss should target about 0.7 percent per week.⁶

Murphy and Koehler pooled the resistance-training trials that compared a deficit to no deficit. Lean mass gains were smaller in the deficit groups, with an effect size of -0.57. Strength gains did not differ significantly. Their meta-regression estimated that a deficit near 500 kcal/day prevented lean-mass gains.⁴ Treat that as an approximate study-level signal rather than a universal cutoff. A mini-cut may exceed it for a short block, with muscle retention as the goal.

03Run one when the bulk drifts

Use a mini-cut to correct a gaining phase. It will not fix a physique that needs 10 kg of fat loss. That job belongs to a standard cut paced by How Fast You Should Lose Fat.

The first three rows come from the gaining guardrails in Lean Bulk Without Belly Gain. Write them into your log on day one of the bulk. A rule you set before the waist moves is easier to follow than a decision you make while looking in the mirror.

Four groups lose more than they gain from a steep deficit.

• Beginners with body fat to lose. They can often recompose at a small deficit and gain muscle at the same time. A steep deficit throws that away.
• Anyone already lean. Helms recommends a slower rate of loss as bodybuilding competitors get leaner to protect lean mass.² A steep deficit is a poor fit when muscle retention is the priority.
• Endurance athletes in a heavy training block. A steep deficit on top of high training volume raises the risk of low energy availability.⁷
• Anyone with a history of binge eating or restrictive eating. Restriction and binge eating have a complex relationship, and individual responses vary.⁸ Get individualized support before attempting an aggressive deficit.

04Set calories and macros

Start from a measured maintenance number. Use the average intake from two weeks of stable weight, or the maintenance estimate from an adaptive tracker. Formula estimates can be off by 300 kcal or more, and that error is half your deficit.

Set calories 20 to 30 percent below that number. Fill protein first, fat second, and carbohydrate last.

1. Protein at 2.2 to 2.6 g/kg of body weight. Mettler used 2.3 g/kg and Longland used 2.4 g/kg.¹³ Helms recommends 2.3 to 3.1 g/kg of lean body mass for lean dieting athletes.² Split it across four meals so each one clears the leucine threshold.
2. Fat at 0.6 to 0.8 g/kg. Helms places fat at 15 to 30 percent of calories for dieting athletes.² For most lifters, 0.6 to 0.8 g/kg lands inside that range and leaves the most room for carbohydrate.
3. Carbohydrate gets the remainder. Put most of it in the meals before and after training. Glycogen is what lets you keep lifting heavy on fewer calories.

Take an 85 kg lifter with a measured maintenance of 3,000 kcal.

At 0.7 kg a week, this lifter loses about 0.8 percent of body weight per week. Four weeks removes 2.5 to 3 kg of fat. Six weeks removes about 4 kg. That matches the 4 to 8 lb most drifting bulks need to shed.

Hunger usually climbs by week three. Plan for it with high-volume foods, lean protein at every meal, and a fixed eating window. The muscle preservation playbook covers the rest of the deficit toolkit.

05Keep the training heavy

Heavy lifting tells the body to keep muscle during a deficit. Keep the load on your main lifts where it was. If recovery slips, cut sets before you cut weight. Most lifters can drop a third of their accessory volume without losing ground. Strength Training Minimum Effective Dose During a Cut sets the floor.

Leave conditioning mostly alone. Adding hard cardio on top of a 25 percent deficit raises the real deficit past what you planned and eats into recovery for the lifts. Keep daily steps steady instead. A drop in steps is the most common reason a mini-cut stalls in week three. People move less when they eat less, and they rarely notice.

Expect the bar to feel heavier in weeks three and four. A 2 to 3 percent dip in top sets is normal glycogen and fatigue. A drop of more than 5 percent on two main lifts means the deficit is too large or the cut has gone on too long.

06Expect a fast first week

The first week can move the scale faster than later weeks, but the size of that shift varies. In a study of nine trained subjects recovering after prolonged exercise in heat, muscle glycogen was stored with at least 3 g of water per gram. The study did not measure weight loss during a mini-cut.⁵ Lower carbohydrate intake can shift glycogen and water, so early scale movement does not show how much fat you lost.

The values below illustrate the 85 kg lifter in the earlier example. They are planning estimates based on that lifter's weekly target, not outcomes from a trial of mini-cuts or targets for every body weight. Compare weekly averages rather than single weigh-ins.

Do not raise the deficit because week two looks slow compared with week one. Week one was mostly water. Use the 7-day average weight and your waist measurement, as covered in How to Tell Fat Loss From Muscle Loss. The daily swings are explained in Why the Scale Jumps Overnight.

07End it on a rule

Pick the end condition before the first day. Mini-cuts fail when they quietly turn into 12-week diets run at a crash-diet deficit.

When the cut ends, raise calories to maintenance in one step. Hold there for one to two weeks. The scale may rise as glycogen and water return, but the size of that change varies. Wait before judging the result. Take waist and weight averages at the end of the maintenance weeks, then restart the surplus at a smaller size than the one that caused the drift. The Post-Cut Maintenance Phase covers the transition in detail.

If you need more than two mini-cuts a year, the surplus is too large. Cut the daily surplus by 100 to 150 kcal and the next mini-cut may never be needed.