EFSA sets a population reference intake of 0.83 g of protein per kilogram per day for healthy adults. That is not a universal optimum for sport, weight loss or older age. Active people often aim higher, but the range depends on goals, energy intake, which body weight is used and health; kidney disease or another clinical context needs individual advice.
Protein is the building material for muscle, skin, enzymes, hormones and the immune system. Unlike fat or carbohydrates, the body cannot store large amounts of it for later, which is why it needs to come in regularly, day after day, rather than in occasional bursts.
EFSA gives healthy adults a population reference intake of 0.83 g/kg/day. It is not a threshold below which one day automatically causes deficiency or an optimum for everyone. The ISSN position stand gives about 1.4–2.0 g/kg/day for healthy exercising people; higher targets during marked energy restriction are selective and should not be multiplied mechanically from a very high current body weight.
Where exactly you land within that range is individual. It depends on whether your main goal is maintaining or actively building muscle, how intensely and how often you train, your age, and whether you are currently eating in a calorie deficit. Rather than hunting for one universal number, it helps more to know the range and find your place in it.
Muscle mass and strength can decline with age; markedly low strength together with other findings may indicate sarcopenia, which requires professional assessment. Older adults therefore generally need more protein than younger people at the same body weight. Aging muscle responds more weakly to the same protein signal, a phenomenon known as anabolic resistance, so reaching the same effect on muscle protein synthesis often requires a larger dose per meal and a higher total daily intake. Expert consensus for older adults therefore commonly points toward roughly 1.0–1.2 g/kg, and higher still for those at risk of sarcopenia.
Strength training increases protein turnover in muscle — the body is both breaking down and rebuilding tissue more actively, and net gain needs extra building material to work with. That is why people who train regularly usually need more protein than people at the same body weight who do not train at all.
The same logic applies during weight loss. In a calorie deficit, some fat-free mass can be lost along with fat. Adequate protein intake, especially alongside resistance training, helps limit that loss. InBody can show an approximate trend in fat and muscle mass, but the measurement alone cannot establish how much of the change was caused by diet; hydration and other conditions also affect the result.
The simplest way to get an approximate daily target is to multiply your body weight in kilograms by the g/kg range that matches your main goal. For people carrying significantly higher body weight, it usually makes more sense to calculate from a target or reasonable weight rather than a very high current weight — in that case it is worth discussing the specific number with a registered dietitian so it also makes sense against your total energy intake.
| Group / goal | Approximate intake | Note |
|---|---|---|
| Healthy adult without increased needs | 0.83 g/kg | EFSA population reference intake, not a personal optimum |
| Active adult, recreational sport | roughly 1.2–1.6 g/kg | Supports recovery and muscle maintenance |
| Strength training, building muscle | roughly 1.4–2.0 g/kg | Per sports nutrition position stands (e.g. ISSN) |
| Weight loss with muscle protection | often 1.4–2.0 g/kg; sometimes higher after individual assessment | Depends on deficit, training and the body weight used |
| Older adults, especially 65+ | about 1.0–1.2 g/kg, higher with sarcopenia risk | Higher need due to anabolic resistance |
Total daily protein is the primary priority. For healthy exercising adults, the ISSN nutrient-timing position stand uses 20–40 g of high-quality protein (about 0.25–0.40 g/kg) roughly every 3–4 hours as a practical reference. This is not a clinical prescription or proof that exactly four meals suit everyone; body weight, age, protein type, the rest of the diet and health status all modify the target.
The so-called 'anabolic window' right after training tends to be overstated in popular culture. Current sports nutrition thinking treats it more as a broad window of several hours around training rather than a precise minute you must hit. What matters far more than exact timing is whether your total daily intake is sufficient and reasonably spread out.
Practical sources include meat, fish, eggs, dairy, legumes, tofu, tempeh, soy foods, nuts and seeds. A well-planned plant-based diet does not need “complementary” proteins combined in every single meal; adequate energy, total intake and variety across the day matter.
A protein shortfall often does not show up clearly or quickly — fatigue, slower recovery or getting hungry soon after a meal can have dozens of other causes. A more objective signal than how you feel is the trend in muscle mass over time, since the number on a bathroom scale does not distinguish between losing fat and losing muscle.
On InBody, estimated skeletal muscle mass is best read as a repeated trend under similar conditions. Stability during weight loss is compatible with a well-designed plan, but it does not prove optimal protein intake; training, total energy, water, illness and estimation error also matter.
InBody cannot tell how many grams you eat or diagnose an amino-acid deficiency. That needs a food record and professional assessment. Bioimpedance can add body-composition trend, not grade diet quality.
Chronically low protein intake can be a concern for older adults, people in a calorie deficit, those eating a poorly balanced diet of any type, and people recovering from illness or surgery. It may contribute to slower recovery and loss of muscle mass or strength, but these changes can have other causes too.
Higher protein intake within common sports-nutrition ranges is generally well tolerated by healthy adults with normal kidney function, but that does not apply universally. KDIGO guidance for adults with chronic kidney disease in stages G3–G5 suggests about 0.8 g/kg/day and advises avoiding intake above 1.3 g/kg/day when there is a risk of progression; the person's clinical team must set their individual target. People with kidney disease or another chronic condition should therefore not adopt a sports-nutrition range without consulting a doctor or registered dietitian. The same caution applies during pregnancy, breastfeeding and other clinical situations.
Protein powder supplements are a convenient tool for reaching your target more easily, not a requirement. Most people can cover their goal through regular food. If you are dealing with digestive issues, a chronic condition, or are simply unsure how much protein you actually need, it is worth discussing a specific number with a doctor or registered dietitian rather than relying only on general tables.
About the measurement
The main page about body composition measurement, result output and the visit.
More reading
FAQ
Healthy active adults often use roughly 1.4–2.0 g/kg/day, sometimes more during a marked deficit under professional guidance. The target depends on starting weight, deficit size, training, age and health and should not be multiplied mechanically from a very high current weight.
Yes. Common sports-nutrition ranges are generally tolerated by healthy adults, but more is not automatically better and long-term evidence for extreme intakes is limited. Kidney disease, pregnancy or another clinical context needs individual advice.
No. The so-called anabolic window is much wider than once believed — it is closer to a window of several hours around training than a matter of minutes. What matters far more than exact timing is whether your total daily intake is sufficient and reasonably spread across multiple meals.
Generally yes. Aging muscle responds more weakly to the same amount of protein, a phenomenon called anabolic resistance, so expert consensus for older adults often points to a higher intake, roughly 1.0–1.2 g/kg and more for those at risk of sarcopenia.
Most people can reach their daily target through regular food — meat, fish, eggs, dairy or legumes. Protein powder is just a convenient supplement for when hitting the target through food alone is hard, not a necessity.
The right target depends on age, activity, the body weight used, energy intake and health. InBody can follow an estimated muscle trend, but diet records and professional context—not bioimpedance alone—determine whether protein intake is appropriate.
