Gaining or losing, pick one

Muscle grows in a surplus. Fat comes off in a deficit. Most people try to run both at the level of single meals: a big lunch because they trained, then a small dinner because the mirror said so. The weekend cancels whatever was left.

Average it over the week and it lands within a couple of hundred calories of maintenance. At maintenance you build little and lose less.

One program, one direction

Pick a direction and hold it for the length of the program. A modest surplus means 200 to 300 calories over maintenance, which shows up on the scale as a kilo or so a month. A moderate deficit means 400 to 500 under, which shows up as about half a kilo a week.

Maintenance for someone training four days a week sits around 31 to 33 calories per kilo of bodyweight, which puts an 80 kg lifter near 2,500 a day. Treat that as a first guess and let a fortnight on the scale correct it.

The numbers are small on purpose. A bigger surplus adds fat faster than it adds muscle, and a bigger deficit starts taking strength off the bar, which defeats the point of training through it.

How to set a surplus

Start with your maintenance calories. If you do not know your maintenance, multiply your bodyweight in kilograms by 31 to 33, depending on how active your day is outside the gym. A desk job sits closer to 31. A job on your feet pushes toward 33.

Add 200 to 300 calories on top of that number. For most people this means one extra meal-sized portion of carbohydrate and protein per day: a bowl of rice with chicken, a couple of eggs on toast, or a protein shake with a banana and oats.

Weigh yourself each morning, after the bathroom and before eating. Record the number and average it at the end of each week. The daily number bounces around with water, food volume and sodium. The weekly average tells the truth.

A gain of 0.25 to 0.5 kg per week means the surplus is working. Faster than 0.5 kg per week and a growing share of the gain is fat rather than muscle. Drop the surplus by 100 calories and check the next week's average. Slower than 0.25 kg per week, or the average sitting flat, means the surplus is too small. Add another 100 calories and reassess.

Protein stays at 1.6 grams per kilogram of bodyweight per day, whether you are gaining or losing. The surplus comes from carbohydrates and fats above that protein floor. The protein article covers food sources and portion sizes.

How to set a deficit

Subtract 400 to 500 calories from the same maintenance number. The target rate of loss is about 0.5 kg per week, measured the same way: daily weigh-ins averaged over seven days.

Keep protein high during a deficit. The same 1.6 grams per kilogram target applies here, and it matters more than during a surplus because the body looks for energy wherever it can find it, and adequate protein protects muscle tissue from being used as fuel.

The calories you remove should come from fats and carbohydrates, not protein. In practice, this looks like smaller portions of rice, bread and cooking oil, with the protein source on the plate staying the same size.

A deficit that drops weight faster than 0.75 kg per week is too aggressive for someone who is also training. Strength starts to fall, recovery suffers, and sleep gets worse. If the scale is moving faster than that, add 100 to 200 calories back in and let the rate settle.

Hunger is higher during a deficit, and the evenings are the hardest part. Front-loading protein at breakfast and lunch helps, because protein is the most satiating macronutrient. A high-protein dinner followed by an early bedtime handles the rest better than willpower does.

The calorie tracking article covers the practical side of counting, including which apps work and how precise you need to be.

A rule for choosing

You do not need a body fat measurement. Stand in front of a mirror and name the first thing you would change. If it is the layer around your middle, cut. If it is how little sits underneath it, gain.

The waistband settles arguments the mirror cannot. If your jeans have been getting tighter for six months, the bulk ended a while ago and the fat kept going. Cut first, then build on the result.

When to switch

A gaining phase runs 12 to 16 weeks, or until the waistband gets uncomfortable. That second marker matters more than the calendar. Some people can gain for sixteen weeks and stay comfortable in their clothes. Others hit the wall at ten weeks. The mirror and the waistband together tell you when the surplus has done its job.

A cutting phase runs 8 to 12 weeks, or until strength starts dropping. Losing weight and maintaining strength means the deficit is working and the muscle is staying. Losing weight and losing reps on the bar means the cut has gone on long enough, or the deficit is too large. Either way, it is time to stop.

Between phases, take two to four weeks at maintenance calories. The body and the appetite both need time to settle at the new weight before you push in the other direction. Training continues as normal during this maintenance break. The only change is the food.

Going from a cut straight into a surplus, or from a surplus into a cut, without a maintenance period in between tends to produce poor results in both directions. The metabolism adapts to the previous phase, and jumping into the opposite one before it resets leads to more fat gain during the surplus and more muscle loss during the cut than you would get with the break.

Tracking your eating around training helps both phases land closer to the target.

The exception

Recomposition, building muscle while losing fat, is real for two groups: people inside their first year or two of training, and people coming back after time away. New or returning muscle responds to almost any consistent work, so it can grow while bodyweight drifts down.

It is also slow, and slow makes a poor advertisement.

Recomp runs twelve weeks and holds the same line the whole way, because recomposition needs that long to show. The scale sits still while it happens. The change turns up in the tape measure and the mirror, on a schedule of its own. Chase both goals at speed and you are back at the alternating meals, which is where this started.

Not sure whether to gain or cut first? The program quiz asks about your goal and matches you to a program built for that direction.