Protein is one of the three basic macronutrients and the building block without which the body cannot function properly. It's used to repair muscle, and to produce enzymes, hormones, and antibodies. The question of how much protein to eat daily doesn't have a single answer — it depends on body weight, activity level, and the goal you're pursuing. In this article we explain how to estimate your own protein needs.
How much protein does the body need?
Protein needs are usually expressed in grams per kilogram of body weight. Here are approximate levels:
- Low-activity person - about 0.8-1.0 g per kilogram of body weight
- Moderately active person - about 1.2-1.6 g per kilogram
- Person doing strength training - about 1.6-2.0 g per kilogram
- Person on a cut - often 1.8-2.2 g per kilogram, to protect muscle mass
A higher protein intake during a calorie deficit helps preserve muscle mass and increases satiety, which makes it easier to stick to the deficit.
Why does activity level matter?
The more you train, the more microscopic damage occurs in muscle fibers that the body has to repair. Protein supplies the amino acids necessary for that process. That's why athletes and physically active people need more protein than people leading a sedentary lifestyle. It's also important to spread protein evenly across several meals during the day, rather than eating the whole portion at once.
Worked example
Suppose you weigh 75 kg and train strength regularly. We assume a level of 1.8 g per kilogram of body weight. Calculation: 75 x 1.8 = 135 g of protein a day.
To cover that requirement, you can spread it across four meals of about 34 g of protein each. In practice this could mean a portion of chicken, eggs, cottage cheese, fish, or plant-based protein sources like lentils and tofu. If you move into a cut, it's worth raising intake to around 2.0 g per kilogram, i.e. 150 g a day.
Frequently asked questions (FAQ)
1. How much protein a day for an average person? Usually about 0.8-1.0 g per kilogram of body weight at low activity levels.
2. Is too much protein harmful? In healthy people, excess protein is usually safe, but with kidney disease it requires medical consultation.
3. What are the best protein sources? Lean meats, fish, eggs, dairy, and plant sources like legumes, tofu, and lentils.
4. Is plant protein worse? It has a different amino acid profile, but combining sources ensures a complete supply.
5. How much protein on a cut? Often 1.8-2.2 g per kilogram, to protect muscle mass.
6. Do I need a protein supplement? It's not necessary if you cover your needs from a normal diet.
7. Does spreading protein throughout the day matter? Yes, evenly spaced portions support muscle protein synthesis.
8. How much protein after a workout? Usually 20-40 g in a post-workout meal supports recovery.
9. Do older adults need more protein? Yes, a higher intake helps counteract age-related muscle loss.
10. Does protein help with weight loss? Indirectly yes, since it increases satiety and protects muscle during a deficit.
To precisely calculate your daily requirement, use the protein requirement calculator on Liczbnik.pl, which factors in body weight and activity level.
Note: This article is for informational purposes only and does not replace advice from a doctor or dietitian. If you have kidney disease, are pregnant, or have specific nutritional needs, discuss your diet with a specialist.