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Published 13 Sep 2026
Cutting means eating less than you burn for long enough to lose a meaningful amount of fat, while keeping the muscle you already have. The second half is where most cuts go wrong, so most of this page is about that.
Healthy adults who train. If you are pregnant or breastfeeding, if you are managing a condition that eating less could affect, or if your relationship with food or the scale has started to worry you, talk to a doctor or a registered dietitian before you cut. For those situations the arithmetic on this page is the wrong tool.
A cut is a phase with an end date. You eat below what you burn, your body makes up the difference from stored fat, and when you have lost what you set out to lose, you stop and eat at maintenance again. A “cut” that never ends is just how you eat now, and it behaves differently: hunger keeps rising, training keeps sliding, and there is no point at which you get to recover.
The piece on what a calorie deficit is covers the mechanics underneath. Here we look at what you build around it.
None of the three is a food to avoid or a window to eat in. Those two questions get far more attention than they earn.
A steeper deficit takes weight off the scale sooner. That is the whole argument for it. Against it: more of the loss comes from muscle, which a 2011 trial in athletes measured directly, training quality drops, hunger and fatigue climb until sticking to the plan becomes the limiting factor, and your body quietly moves less outside the gym.
A rough guide that holds up in practice: aim to lose about half a percent of your body weight per week. At 80 kg that is roughly 400 g a week, slow enough to keep training hard and fast enough that a month shows on the tape. That pace is also what a deficit of a few hundred kcal a day comes to, which is where the app’s window sits.
Fitener keeps the calorie target inside a window for the goal you picked, and never lets it drop below what your body burns at rest. The TDEE calculator applies that to your numbers and says when the window, rather than the percentage, set your target.
Most cuts that work run somewhere between 8 and 16 weeks. Shorter than that and there is little to show; longer and training and appetite usually start telling you to stop.
Two signs a cut has run long enough for now:
Both are reasons to eat at maintenance for a couple of weeks. A cut you pause is a cut you can pick up again.
| When | What you usually see | What it mostly is |
|---|---|---|
| First week | a fast drop, a kilo or two | water and the food in your gut |
| Weeks two and three | a much slower, noisier line | the first real fat loss, hidden by daily water swings |
| Week four onward | a trend you can read | fat loss, if you look at weekly averages |
I have weighed myself almost every morning since 2018, and the single most useful thing that taught me is to ignore any one reading. A day’s weight moves by more from water than a week’s fat loss does. Compare weekly averages and give it three weeks before you change anything.
A day over target is not a moral failure and it barely moves the maths: one big meal changes a week by very little and a month by almost nothing. What costs you is treating a single day as a verdict and giving up.
When the cut ends, raise your calories on purpose rather than by drifting. How to do that is the subject of the piece on how to bulk.
Enough to show over a few weeks, small enough that your training and sleep survive it. Fitener sets one from your own numbers and keeps it inside a window for your goal; the TDEE calculator shows the figure.
Some, unless you give your body a reason not to: enough protein and training that keeps asking for the muscle. Those two do most of the work.
No. Cardio raises what you burn; eating less does the same. Adding a lot of cardio on top of a steep deficit mostly costs recovery.
8 to 16 weeks is typical. Stop earlier if training quality or appetite tells you to; pausing at maintenance is normal, not a defeat.
Enough protein, foods you will still be eating in week six, and enough volume that you are not permanently hungry. Which foods matters far less than whether you can keep the pattern up.
The calculators behind this: TDEE calculator · protein page
More reading: what a calorie deficit is · how to bulk · all posts
Fitener runs these rules on the data you log, so the targets move when you do, and it puts what you ate next to them. One app for the training and the eating.