How Much Protein Per Day? The Latest Science Explained

Proteins are the building blocks of life—but how much do you really need to stay healthy and fit? Whether you’re aiming to build muscle, lose weight, or simply maintain your health, your daily protein intake plays a crucial role. However, the optimal amount varies from person to person. Learn how to tailor your diet to meet your goals and ensure your protein intake matches your lifestyle.

What Is Protein and How Does It Work in the Body?

Proteins are essential nutrients for the human body and play a key role in many bodily processes. They help build and repair cells and tissues and are made up of amino acids, which serve as building blocks for various structures. Skin, hair, and muscles rely heavily on adequate protein intake. While the body can produce some amino acids, we must obtain the essential amino acids through food.

Essential Amino Acids:

• Isoleucine
• Leucine
• Lysine
• Methionine
• Phenylalanine
• Threonine
• Tryptophan
• Valine

Non-essential Amino Acids:

• Alanine
• Arginine
• Aspartic Acid
• Asparagine
• Cysteine
• Glutamine
• Glutamic Acid
• Glycine
• Histidine
• Proline
• Serine
• Tyrosine (essential for children)

Protein Per Kg: How to Calculate Your Optimal Intake

The German Nutrition Society (DGE) recommends a daily protein intake of 0.8g per kilogram of body weight. This guideline provides a baseline, but individual needs may vary, especially for those who are physically active. For ambitious amateur athletes and professional athletes, the DGE recommends 1.2 to 2.0g of protein per kilogram of body weight daily. In such cases, supplements can help meet these higher protein requirements to achieve optimal results.

How Much Protein per Day for Weight Loss?

If you're aiming to lose weight, reducing your protein intake is a common mistake you should avoid. Your protein needs remain the same, whether you're looking to lose weight or maintain it. Reducing protein too much can result in muscle loss—something you want to avoid during weight loss. For individuals who are underweight or overweight, the recommended protein intake should always be calculated based on a normal weight as there are no specific reference values for these conditions.

How Much Protein per Day for Muscle Building, Health, and Body Composition?

For maintaining normal bodily functions and a healthy body composition, the DGE guidelines are generally sufficient. However, if your goal is to build muscle and achieve rapid progress, your protein intake can be higher. That said, you don’t need to overdo it—muscles are only about 20% protein, the rest is mainly water. If your weekly training exceeds five hours, it may be worth increasing your protein intake and considering supplements to meet your needs.

For general health and fitness, it's also important to control body fat and increase muscle mass. For women aged 20 to 79, the recommended body fat percentage is 21 to 35%, while for men it should be between 8 and 24%.

Protein Sources: Which Foods Provide the Best Amount?

Here are some of the most important plant-based protein sources:

• Grains and pseudograins (e.g., rice, oats, and bread)
• Legumes like soy, lentils, and beans
• Rapeseed
• Nuts

And these are some key animal-based protein sources:

• Game
• Tuna
• Mature cheese
• Low-fat milk
• Yoghurt
• Eggs

Micronutrients for Protein Metabolism

If you want to support protein metabolism, micronutrients play an important role. For example, biotin, zinc, and chromium contribute to the normal metabolism of macronutrients, including protein. Molybdenum helps metabolise sulphur-containing amino acids, and vitamin B6 is also crucial for a normal protein metabolism. It's important to ensure your diet includes these micronutrients.

Protein and Collagen: Why Your Body Needs Protein for Collagen Production

Collagen production relies on two key amino acids—proline and glycine. These are among the building blocks that make up proteins. If you want your body to produce more collagen, you need to focus on a protein-rich diet. If you're unable to get enough protein from meals, supplements can be useful, especially during periods of intense training.