How Much Protein Do You Need Daily? Ranges by Weight, Age and Goal

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.

The commonly cited baseline for a healthy sedentary adult is around 0.8 grams of protein per kilogram of body weight per day, a figure that traces back to recommendations from bodies like WHO and EFSA and covers minimum needs, not an optimal training target. For people who are active, train with weights, want to build muscle, or are losing weight while trying to preserve it, sports nutrition position stands — for example from the International Society of Sports Nutrition (ISSN) — typically point to a considerably higher range, roughly 1.2 to 2.2 g/kg.

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.

Sarcopenia, the gradual age-related loss of muscle mass and strength, is one reason older adults 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, the body naturally tends to break down some muscle along with fat. A higher protein intake during this phase helps protect muscle, so more of the weight lost comes from fat rather than lean tissue — and that is exactly the kind of difference an InBody trend can show over time.

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.

Total daily protein is the most important factor for muscle mass, but how you distribute it through the day also matters. To meaningfully trigger muscle protein synthesis, nutrition literature commonly cites roughly 20–40 grams of quality protein per meal as a useful reference point — the exact figure varies with body weight, age and protein type, but the principle holds: one huge meal in the evening does not use the same potential as spreading intake across three to four meals a day.

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 protein sources to build a daily target around include poultry and other meats, fish, eggs, dairy, legumes, tofu and soy products, or chickpeas and lentils. Combining animal and plant sources usually covers amino acid needs better than relying on a single food type, especially on a fully plant-based diet.

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, skeletal muscle mass (SMM) is best read as a repeated trend under similar conditions, not as one isolated number — the article on reading muscle mass on InBody covers this in more detail. If fat is dropping while muscle mass holds steady or declines only slightly during a diet, that is a signal your protein intake and training are likely doing their job. If muscle mass drops faster than expected, it is worth checking your total protein and calorie intake specifically.

InBody by itself cannot tell you how many grams of protein you are eating — for that you need a food log or a conversation with a dietitian. What it does show well is the outcome of your nutrition and training in the form of an actual muscle mass trend, alongside phase angle as an orientational extra marker of cellular condition. Combining a food log with regular measurement gives a far more reliable picture than either one alone.

Chronically low protein intake is a particular risk for older adults, people in a calorie deficit, vegetarians and vegans without a well-planned diet, and anyone recovering from illness or surgery, when the body needs extra protein for repair. It typically shows up as slower recovery, gradual loss of muscle mass and strength, or poorer healing.

High protein intake within commonly recommended ranges is generally considered safe for healthy adults with normal kidney function, but that does not apply universally. People with kidney disease or another chronic condition should discuss any significant increase in protein intake with a doctor first, since a higher intake can affect their body differently than a healthy person's. The same caution applies during pregnancy, breastfeeding, or while taking certain medications, where it is worth discussing a target intake with a specialist.

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.