Protein is building material.But more is not automatically better.

Your body is always rebuilding

After digestion, amino acids are available as individual building blocks. Your body sorts and assembles them into the proteins a cell currently needs. It can make some amino acids; others must come regularly from food.

Unlike body fat, there is no large dedicated protein storage depot. The body has a dynamic amino-acid pool and turns over its own proteins, but it cannot simply draw indefinitely from a stocked pantry when building blocks are missing.

How much protein is enough?

For healthy adults up to age 65, the DGE sets a reference value of 0.8 grams per kilogram of body weight per day. EFSA’s European population reference of 0.83 grams is nearly identical. For people aged 65 and older, the DGE uses an estimate of 1.0 gram per kilogram.

These values are designed to cover the needs of a population group. They do not mean every person has the same exact target. Body composition, total energy intake, pregnancy and lactation, training, age, and illness all change the context. For ambitious sport of at least five hours per week, the DGE lists 1.2 to 2.0 grams per kilogram depending on goals and training load—not as a default for everyone.

Plant or animal? The mix matters

Animal foods often have amino-acid profiles and digestibility that align closely with human needs. Plant sources vary more, but can complement one another. Grains and legumes are a classic pairing—for example, bread with hummus, rice with beans, or lentils with grains.

Every meal does not need to be mathematically perfect. A varied diet across the day matters more. People eating mostly or entirely plant-based diets should pay particular attention to variety, sufficient total energy, and appropriate portions.

Training, timing, and the shake

Resistance training provides the stimulus; protein supplies building material. In a large meta-analysis, protein supplementation during prolonged resistance training was associated with small additional gains. Above a total daily intake of about 1.62 grams per kilogram, the study’s statistical model found no further gain in fat-free mass. That is a result from a specific research context, not a magic line for every person.

The famous narrow “anabolic window” is also oversold. After accounting for total protein intake, a timing meta-analysis found no clear additional benefit for strength or muscle growth. In practice: eat enough across the day and place meals around training in a way that is comfortable and sustainable.

Kidneys, liver, and very high intakes

In healthy adults, the long-term effect of substantially higher protein intake on kidney function is not conclusively established; the DGE describes the evidence as heterogeneous. That supports neither an unlimited free pass nor a blanket claim of harm.

Kidney disease, liver disease, metabolic conditions, pregnancy, and medical treatment raise different questions. In those settings, amount, sources, and distribution should be discussed with a physician or qualified dietitian—especially before using high-dose supplements.

Health status beats an internet rule of thumb: with a medical condition, the right protein intake is an individual decision.

What protein looks like in daily life

These DGE examples illustrate how differently foods can contribute. Values vary with product, portion, and preparation; they are not meal plans.

The most useful protein strategy is rarely spectacular: varied sources, appropriate portions, enough total energy, and—when muscle gain is the goal—consistent resistance training.