Body recomposition: what it is and how it differs from weight loss

The term comes from competitive bodybuilding, where it meant preparing to step on stage: losing fat while maintaining muscle, and shedding water in the final days. Outside of the stage, it is used to describe regular weight loss, and along with the term, people adopt methods designed for a goal that most do not have.

What the word originally meant

In competitive preparation, there are two distinct tasks. The first is to reduce body fat to very low levels while preserving as much muscle mass as possible; this takes months. The second is to shed water and highlight muscle definition; this is done in the final days before a competition and has nothing to do with body composition.

Of this pair, the second part has entered everyday usage, specifically as a set of techniques: restricting water, eliminating salt, and "depleting" carbohydrates. The goal they were designed for is to look a certain way on one specific day. For someone who wants to reduce body fat and continue living their life, these techniques offer nothing but dehydration.

In terms of physiology, "cutting" (or "drying out") is simply weight loss: a calorie deficit plus conditions under which weight loss comes primarily from fat.

What determines whether you lose fat or muscle

Three things, and the first is more important than the others.

Rate of weight loss. A study on high-level athletes compared two rates: about 0.7% of body weight per week and about 1.4%. Total weight loss was comparable, but the slow group lost more fat, and their lean body mass increased; in the fast group, it remained unchanged. For a person weighing 80 kg, 0.7% is approximately 550 grams per week.

Protein. Sufficient protein intake during a deficit shifts the balance of loss toward fat. Guidelines and ways to meet your daily requirement can be found in the article on daily protein intake.

Strength training. Muscle that continues to receive a load is lost more slowly. A review of recommendations for athletes working on their physique brings these three conditions together.

What you should not do during a "cut"

• Restrict water. A competitive preparation technique that is harmful and meaningless in everyday life. How much to drink and where the two-liter recommendation came from is covered in the article on water.
• Completely eliminate salt. Sodium is necessary, and drastic restriction leads to weakness and dizziness. The conversation about salt makes sense when discussing processed foods, where it is indeed abundant.
• Remove all carbohydrates. A separate approach exists and is analyzed in the article on the keto diet, but it is not a mandatory condition for "cutting": fat is lost due to a deficit, not the absence of carbohydrates.
• Go into a deep deficit. Faster does not mean better — see the comparison of rates above.
• Rely on fat burners. What their typical components do in the body is analyzed in the article on fat burners.

What a reasonable approach looks like

1. A 10–20% deficit from your expenditure. This is calculated from your daily calorie requirement and recalculated as weight decreases.
2. A rate of 0.5–1% of body weight per week. Lower is slow and imperceptible; higher leads to increased muscle loss.
3. Protein at 1.4–1.6 g per kilogram. Distributed across meals, rather than eaten all at dinner.
4. Strength training 2–4 times per week. The load is the signal that tells the muscle to be preserved.
5. Monitor using a moving average of weight. Daily fluctuations within a kilogram are water, not results.

Expectations should be aligned with arithmetic in advance: why linear projections overestimate results is analyzed in the article on calories in a kilogram of fat.

Where the reasonable ends

A very low body fat percentage is not a neutral state. Competitive athletes at the peak of their preparation experience a decrease in sex hormone levels, menstrual cycle disruption in women, impaired sleep and mood, and constant hunger. This state is maintained only briefly and for a specific date.

For someone without such a date, the goal is usually formulated differently: not the minimum possible body fat percentage, but the body composition that can be maintained without daily struggle. What happens when weight loss stops halfway is analyzed in the article on plateaus.

Two signs indicate that it is time to stop and see a doctor rather than tighten your regimen: the cessation of menstruation and obsessive thoughts about food, weight, and control. The former is not a sign of successful preparation, but a disorder with consequences for bone tissue. The latter relates to eating disorders, and self-imposed restrictions in these cases only worsen the situation.

Count it from a photo

Frequently asked questions

How does "cutting" differ from regular weight loss?

Physiologically, there is no difference: it is the same calorie deficit. The distinction lies in the set of conditions that ensure weight loss comes primarily from fat: a moderate pace, sufficient protein intake, and resistance training. Techniques involving water manipulation are related to competitive preparation, not body composition.

At what rate can weight be reduced to preserve muscle mass?

A good benchmark is about 0.5–1% of body weight per week. In a study on athletes, a rate of 0.7% per week resulted in greater fat loss and an increase in lean body mass, whereas at 1.4%, lean body mass remained unchanged despite a comparable total weight loss.

Is it necessary to eliminate salt and restrict water intake?

No. These are pre-competition preparation techniques intended for one specific day. In everyday life, they lead to dehydration, weakness, and dizziness without affecting the amount of body fat.

Is it mandatory to eliminate carbohydrates?

No. Fat loss occurs due to an energy deficit, not the absence of carbohydrates. A low-carb approach exists and works, but it is not a mandatory requirement and is comparable to other methods in terms of long-term results.

How much protein is needed during a cut?

A benchmark is 1.4–1.6 g per kilogram of body weight per day, distributed across meals. Sufficient protein intake combined with resistance training shifts weight loss toward fat.

Read next

• Calorie deficit: how to calculate it and how to hold it — A calorie deficit is the one thing without which weight does not come down.
• How much protein do you need per day — There are two opposing figures regarding protein: the official recommendation of about 0.
• Weight loss plateau: why weight stalls and what to do about it — The weight has stayed at the same number for the third week in a row, even though the diet hasn't changed — and the first instinct is usually the same: to cut even more.

This article is for general information. It is not medical advice, a diagnosis, or a prescription for treatment or a diet, and it does not replace a consultation with your doctor. If you have a health condition, are pregnant, take medication, or follow a diet prescribed to you, decisions about food belong with your doctor.

Figures from regulations, guidelines and studies are given as they stood when this article was prepared and may since have changed; check them against the primary sources. This article is not advertising, an offer, or individual advice, and neither the author nor the site owner is responsible for decisions taken on the basis of it.