The Importance of Protein and How Much to Consume

By Stayinghealthy !


Protein is a vital nutrient that supports growth, tissue repair, enzyme and haemoglobin formation. Although it's critical for health, over-consumption may lead to risks such as kidney stones or heart disease. In the United Kingdom, many people already exceed their needs — the recommended intake is about 0.75 g of protein per kilogram of body weight. For example, a small chicken breast with roughly 30 g of protein is a good meal-option to meet your requirement with ease.

What Is Protein and Why It Matters

Proteins are macronutrients composed of amino acids — the building blocks for nearly every cell and process in the body. They help make up muscle, skin, bone, hair, nails, enzymes, hormones and immune system components. Protein plays many essential roles from growth and repair to immune health.

When you consume protein in food, your body breaks it down into amino acids and uses them to build new proteins needed for the body’s ongoing functions. This means without sufficient protein you may struggle with muscle maintenance, wound healing, immunity and more.

How Much Protein Do You Need?

General guidelines for adults

In the UK, the commonly used reference is about 0.75 g of protein per kilogram of body weight per day for healthy adults. For example, a person weighing 70 kg would aim for roughly 52.5 g of protein daily.

Most adults need around 0.75 g/kg per day, which would equate to about 45 g for the average woman and 55 g for the average man in the UK context.

When needs are higher

However, this baseline doesn’t apply to everyone. Certain groups require more protein:

  • Older adults – due to reduced muscle synthesis, some experts suggest higher intake.
  • People recovering from illness or surgery – bodies in repair mode need increased protein.
  • Athletes or very active individuals – demand rises with increased muscle breakdown and turnover.

Upper limits and caution

The body can use only so much protein at once for optimal effect. General recommendations are to consume 15-30 g of protein at each meal, and studies show that consuming more than 40 g in one sitting adds little extra benefit.

While intakes up to twice the RNI (i.e., ~1.5 g/kg) are still considered safe for many healthy adults, there is limited long-term data on very high protein intakes.

Which Sources of Protein Are Best?

Just as important as how much protein you eat is where it comes from. A balanced diet uses both animal and plant-based proteins. The UK guidance suggests including lean meats, fish, eggs, dairy, beans, lentils, pulses, nuts and seeds.

Animal-based proteins

These include meat, poultry, fish, dairy and eggs. They are typically “complete” proteins — meaning they contain all the essential amino acids your body needs. For example, a small chicken breast might deliver around 30 g of protein.

However, eating large amounts of red and processed meat may increase risks for heart disease and certain cancers — and many people in the UK already consume more protein than required.

Plant-based proteins

Beans, lentils, tofu, soya, peas, nuts and seeds are all effective protein sources. The good news: vegetarians and vegans can meet their protein needs by eating a wide variety of these foods.

Plant proteins often come with additional benefits such as fibre, lower saturated fat and higher micronutrient content — but some may lack certain amino acids or be less bioavailable. The strategy: variety and adequate amounts.

Timing and Distribution of Protein Intake

It’s not just the total amount of protein per day that matters — how you distribute it across meals also plays a role. Consuming about 25-30 g of high-quality protein per meal (two to three meals per day) appears optimal for healthy adults to stimulate muscle protein synthesis.

Older adults in particular may benefit from spreading protein evenly across meals rather than concentrating it in one sitting.

What Happens if You Eat Too Little or Too Much Protein?

Too little protein

Insufficient protein intake can lead to muscle loss (sarcopenia), poor wound healing, weakened immune function, fatigue and in severe cases, malnutrition. Adults recovering from surgery should aim for about 1 g/kg per day to support healing.

Excessive protein intake

While many healthy individuals already consume more than needed — and serious adverse effects are uncommon — some risks exist especially if protein is coming from unhealthy sources or replacing other important nutrients. Sources such as red or processed meat, high-protein bars or shakes high in saturated fat or sugar may increase heart disease risk and displace fibre, vitamins and minerals.

Consuming more than about 40 g of protein at one meal provides little extra benefit and may be a less efficient use of dietary protein.

Practical Tips for Including Protein in Your Diet

  • Include a protein source at every meal — for example eggs or Greek yoghurt at breakfast, lentil soup or chicken salad at lunch, fish or tofu with veggies at dinner.
  • Aim for about 25 g of protein per meal (for many adults this might mean ~100–120 g of cooked lean meat or fish, or ~250 g of yoghurt, or ~60 g of tofu plus beans). This level helps stimulate muscle synthesis.
  • Choose lean cuts of meat and skinless poultry; favour fish (including oily fish) at least twice a week. Limit red and processed meat to no more than ~70 g per day.
  • For plant-based meals: mix pulses, beans, nuts, seeds and whole grains to ensure full amino acid coverage.
  • Snack smart: plain yoghurt with nuts or seeds, hummus with whole-grain crackers, hard-boiled eggs, and edamame beans are good options.
  • Check food labels to compare and choose higher-protein alternatives when relevant.

Special Considerations: Ageing, Health Conditions & Athletes

As we age, muscle mass naturally declines unless actively countered with adequate protein and resistance activity. Older adults may benefit from about 1.2 g/kg/day instead of the standard 0.75 g/kg to preserve muscle and function.

People recovering from injury or surgery, or those with chronic illness, may have even higher needs. For example, a hospital source recommends about 1 g/kg per day for typical adult recovery and higher depending on severity.

Athletes or those engaged in heavy training often need more protein — perhaps up to 1.6–2.0 g/kg/day depending on goals and activity — though exact needs vary and should be tailored with a sports dietitian.

Common Myths and Misconceptions

Myth: “More protein always means more muscle.” Reality: After a certain threshold (~25-30 g per meal) extra intake offers diminishing returns for muscle synthesis.

Myth: “Only meat provides good protein.” Reality: A well-planned plant-based diet can meet all amino acid needs, so long as variety and sufficient total intake are present.

Myth: “I’m eating a high-protein diet so I don’t need to worry about other nutrients.” Reality: Over-emphasis on protein may lead to neglect of fibre, vitamins, minerals and healthy fats — balanced nutrition is key.


Protein is essential for health: growth, repair, immune function and more. Most healthy adults in the UK can meet their protein needs by aiming for about 0.75 g per kilogram of body weight per day and ensuring about 25 g at each main meal. Certain groups — older adults, recovering patients, athletes — may need more. The quality and distribution of protein matter, and choosing a variety of lean, nutrient-rich sources is the best approach. Excessive intake from poor sources may carry risks, so focus on whole foods and balance. By doing so, you can support your body’s needs without over-complicating your diet.

FAQ

Q: Can I consume more than 0.75 g/kg of protein if I’m active or trying to build muscle?
A: Yes — many athletes or people in heavy training may require higher intakes (e.g., 1.2-2.0 g/kg) depending on their goals and energy balance. It’s best to consult a qualified sports dietitian.
Q: Is it harmful to eat large amounts of protein long-term?
A: For most healthy people, moderate increases are safe, but very high intakes (especially from processed or high-saturated-fat sources) may increase risks for kidney stress, heart disease or displacing other nutrients. Using the 15-30 g per meal guideline helps keep intake efficient.
Q: Do vegetarians and vegans need to combine proteins at each meal?
A: Not necessarily. While earlier advice stressed combining specific plant proteins, more recent guidelines say that eating a variety over the day provides all essential amino acids.
Q: Should older adults increase their protein intake?
A: Yes — research shows that older adults may benefit from higher protein intake (e.g., about 1.2 g/kg/day) and evenly distributed meals of around 25–30 g protein per meal to maintain muscle function.
Q: How do I know if I’m getting enough protein?
A: Calculate your body weight in kg and multiply by your target (e.g., 0.75 g/kg). Keep track of protein-rich foods you eat. If you’re recovering, older, or training heavily, aim higher and monitor muscle strength, recovery, appetite and energy levels. If unsure, consult a dietitian.

Further Reading & References