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Protein is a fundamental component of our diet, essential for maintaining health and proper body function. But how much protein do we really need, and what are the best sources? In this article, we explore the key aspects of protein consumption, its sources, and its importance for different groups of people.
How Much Protein Do You Need?
The amount of protein you need depends on various factors such as age, gender, physical activity level, and overall health. General recommendations suggest that an adult should consume about 0.8 grams of protein per kilogram of body weight per day. This means a person weighing 70 kg should consume approximately 56 grams of protein daily. While this amount may seem small, it is the minimum necessary to support basic bodily functions.
However, athletes, individuals engaged in heavy physical labor, or those recovering from illness may require more protein. As research shows (Kreider RB, Campbell B, The Physician and sportsmedicine, 2009), athletes may need 1.2 to 2.0 grams of protein per kilogram of body weight for optimal recovery and muscle mass maintenance. For example, an athlete weighing 80 kg might need between 96 to 160 grams of protein daily, depending on training intensity. This is because intense physical activity causes micro-damage to muscles, which require protein for repair.
Additionally, protein needs can change with age. Older adults may need increased protein intake to prevent muscle loss, known as sarcopenia. This is crucial for maintaining mobility and overall health. As we age, the body becomes less efficient at utilizing protein, so intake should be increased to prevent muscle mass loss.
Protein Sources: Animal and Plant-Based
Protein can be obtained from various sources, categorized as animal and plant-based. Animal sources like meat, fish, eggs, and dairy products typically contain all the essential amino acids that the body cannot synthesize on its own, making them complete protein sources. For instance, chicken breast, beef, and salmon are excellent sources of easily digestible protein. Animal proteins also contain important micronutrients like iron and vitamin B12, which are hard to obtain from plant sources.
Plant-based protein sources include legumes, nuts, seeds, and grains. Although some plant foods may lack all essential amino acids, combining them can provide a complete amino acid profile. As noted in research (Pinckaers PJM et al., Sports medicine, 2021), plant proteins can effectively support muscle mass if consumed in sufficient quantity and variety. For example, combining rice and beans creates a complete amino acid profile. Plant proteins also provide fiber, which supports gut health.
For vegetarians and vegans, it’s important to focus on a variety of plant-based protein sources to ensure all essential amino acids are consumed. Including foods like quinoa, soy, and chickpeas can help achieve this. Some plants, like soy, contain all essential amino acids, making them particularly valuable for vegans.
Protein Quality: What You Need to Know
Protein quality is determined by its ability to provide the body with essential amino acids. It’s important to consider the Digestible Indispensable Amino Acid Score (DIAAS), which accounts for both the quantity and quality of amino acids in a food. High-quality proteins have a high DIAAS, meaning they are well absorbed by the body.
As research shows (Matthews JJ et al., The Journal of nutrition, 2025), animal proteins generally have a higher DIAAS than plant proteins. However, this doesn’t mean plant proteins aren’t beneficial. It’s important to ensure variety in the diet to obtain all necessary amino acids. For example, combining different plant sources can compensate for the lack of certain amino acids in each. This is especially important for those following a plant-based diet.
Moreover, food processing can affect protein quality. For instance, thermal processing can reduce protein digestibility, so cooking methods should be considered. Boiling or baking can preserve more amino acids than frying.
The Impact of Protein on Health
Protein plays a crucial role in many bodily processes, including tissue building and repair, enzyme and hormone production, and immune system support. Adequate protein intake can help reduce the risk of certain conditions, such as sarcopenia (age-related muscle loss) and osteoporosis. Protein also aids recovery from injuries and surgeries, making it an important dietary component for those in rehabilitation.
Additionally, protein can influence gut microbiota composition. Research (Zhao J et al., Current protein & peptide science, 2019) shows that different protein sources can affect the microbiota differently, which can impact overall health and metabolism. For example, plant proteins may promote the growth of beneficial gut bacteria, positively affecting digestion and immunity.
It’s also worth noting that excessive protein intake can have negative health effects, such as kidney strain. Therefore, it’s important to adhere to recommended protein intake levels. Individuals with chronic kidney disease should be particularly cautious and consult a healthcare provider about optimal protein intake.
Practical Tips for Protein Consumption
To ensure adequate protein intake, it’s important to include a variety of protein sources in your diet. Here are some tips:
- Combine animal and plant proteins for a complete amino acid profile. For example, add some chicken breast or eggs to a bean salad. This helps provide all essential amino acids.
- Focus on protein quality by choosing foods with a high DIAAS. Include foods like eggs, dairy, and soy products in your diet. They provide high-quality, easily digestible protein.
- For athletes and those with high physical activity, it’s important to monitor protein intake to support muscle recovery and growth. Plan meals so that protein is evenly distributed throughout the day. This helps maintain a constant level of amino acids in the blood.
- Consider the impact of protein on gut microbiota and include gut-friendly foods like yogurt and kefir in your diet. This helps maintain a balance of beneficial gut bacteria.
- Account for individual needs and dietary restrictions, such as allergies or intolerances to certain foods. For example, if you’re lactose intolerant, choose lactose-free dairy products or plant-based alternatives.
Scientific Sources
- Common questions and misconceptions about protein supplementation: what does the scientific evidence really show?, Journal of the International Society of Sports Nutrition, 2024
- Dietary Protein and Gut Microbiota Composition and Function, Current protein & peptide science, 2019
- Protein for exercise and recovery, The Physician and sportsmedicine, 2009
- Understanding Dietary Protein Quality: Digestible Indispensable Amino Acid Scores and Beyond, The Journal of nutrition, 2025
- The Anabolic Response to Plant-Based Protein Ingestion, Sports medicine (Auckland, N.Z.), 2021
Read Also
- Which foods strengthen the immune system and help fight diseases
- How to eat properly during sports activities to achieve better results
If you want to learn more about how to balance your diet and receive personalized protein intake recommendations, book a consultation with our dietitian.