What is protein?
Protein is an essential nutrient your body uses for growth, repair and maintenance. It also helps meals feel more filling.
Protein is a macronutrient made from amino acids that helps the body grow, repair and maintain tissues. It is found in foods such as beans, lentils, fish, eggs, meat, dairy, tofu, nuts and seeds.
Protein is important, but it is only one part of nutrition. A sensible diet still needs enough energy, fibre, fruit, vegetables, carbohydrates, fats, vitamins, minerals and fluid.
Why protein matters
Protein helps with growth and repair, which is why it matters for everyday health, activity, training, recovery and maintaining muscle as part of a balanced diet.
The NHS Eatwell Guide groups beans, pulses, fish, eggs, meat and other proteins together as foods that provide protein, vitamins and minerals. It also recommends choosing leaner meat options and eating at least two portions of fish a week, including one oily fish portion where suitable.
Estimate your daily protein range
Use the protein intake calculator to estimate a general, active or training-focused protein range from your body weight.
How much protein do adults need?
For many healthy-weight adults, UK nutrition sources commonly use a baseline of around 0.75g of protein per kilogram of body weight per day. This is a general population reference point, not a personalised target for every health situation.
General baseline protein = body weight in kg × 0.75gPeople who are very active, older, recovering from illness, pregnant, breastfeeding or managing a medical condition may need different advice. A generic calculator should not replace guidance from a GP, dietitian, midwife or other qualified professional.
Common protein food sources
Protein can come from animal and plant foods. A balanced approach usually means varying sources rather than relying on one food or supplement.
| Food type | Examples | Useful note |
|---|---|---|
| Beans and pulses | Lentils, chickpeas, peas, kidney beans, baked beans. | Often lower in fat and also provide fibre. |
| Fish and seafood | Salmon, sardines, tuna, prawns, cod. | NHS guidance recommends two fish portions a week, one oily where suitable. |
| Eggs and dairy | Eggs, milk, yoghurt, cheese. | Can be practical everyday protein sources. |
| Meat and poultry | Chicken, turkey, lean beef, pork. | Choose lean cuts and limit red and processed meat. |
| Plant proteins | Tofu, tempeh, soya mince, nuts, seeds. | Useful for vegetarian, vegan or mixed diets. |
Worked example
Suppose someone weighs 80kg and wants a general baseline protein estimate.
80kg × 0.75g = 60g protein per dayIf that person is training regularly, the protein calculator may show a higher planning range. That does not automatically mean they need supplements; it simply gives a rough target to compare against normal meals.
Protein and different goals
Protein needs can vary depending on the person and the goal. The safest way to present this is as a range, not as one exact number.
- General health: a baseline estimate can help you see whether your intake is roughly in line with common adult guidance.
- Weight-loss planning: protein may help meals feel more filling, but a balanced eating pattern and safe calorie deficit still matter.
- Muscle and training: active people may use higher protein ranges, but training, sleep, total calories and consistency matter too.
- Health conditions: kidney disease, pregnancy, eating disorders, recovery from illness and other conditions need professional advice.
Do you need protein powder?
Not necessarily. Protein powder can be convenient, but it is not required if you can meet your needs from normal food. For many people, meals built around beans, pulses, fish, eggs, dairy, tofu or lean meats are enough.
Supplements should not be used to replace a balanced diet, and anyone with a medical condition, pregnancy, breastfeeding, a history of disordered eating or concerns about kidney health should get professional advice before changing intake sharply.
Protein FAQs
What does protein do?
Protein helps the body grow, repair and maintain tissues. It is also part of enzymes, hormones and many everyday body functions.
How much protein do I need per day?
A common UK adult baseline is around 0.75g per kg of body weight per day, but needs can vary with activity, age, health, pregnancy, breastfeeding and medical context.
Is more protein always better?
No. More is not automatically better. Protein should fit within an overall balanced diet, and very high intakes may not be suitable for some people.
Can vegetarians and vegans get enough protein?
Yes, but it may take more planning. Beans, lentils, tofu, soya foods, nuts, seeds and other plant foods can contribute protein across the day.
Sources and notes
- British Heart Foundation protein guidance: BHF — protein: how much do you need?
- NHS Eatwell Guide: NHS — The Eatwell Guide
- British Nutrition Foundation protein information: BNF — protein