The main role of protein in the body is for growth, repair and maintenance of cells, and it also provides some energy. Most people associate it with building and maintaining muscle, but it also works to build and repair cartilage, ligaments, skin, hair and other tissues, as well as making enzymes, hormones and antibodies for our immune system.
Complete sources of protein, i.e. those that contain all 9 essential amino acids which our body cannot make itself are usually animal sources like meat, fish and dairy.
Plant sources of protein like pulses, tofu and soya products, nuts, seeds and wholegrains generally contain some essential amino acids but not all, so we need a variety of different plants and grains to make sure we get all the essential amino acids we need.
How much?
In general, the recommended amount of protein for adults is 0.75g per kg bodyweight per day. On average this works out about 56g per day for men and 45g for women – or 2 palm sized portions of protein rich food like meat, fish, eggs, dairy products, pulses (peas, beans and lentils), whole grains and soy-based products.
Our requirements for protein can vary depending on different factors including; weight, duration and intensity of exercise and different disease states. You can find more information on specific individual protein requirements here.
However, most of us are already eating above the requirements already. The average daily intake in the UK for men is 88g per day, and 64g for women, so it’s generally unnecessary to increase protein intake. Although excess protein in our diet has not been found to be harmful (except for those with certain health conditions), excess can potentially be stored as fat. And some high protein foods (like red meat) can be high in saturated fat. For this reason, try and choose leaner cuts of meat and opt for chicken, turkey or fish more often than red meat like beef, pork or lamb.
What counts as a portion:
60-90g cooked meat (like beef, lamb, chicken, turkey, pork), which would look like:
4-6 tbsp cooked mince
½ cooked chicken breast
4 tbsp beans (kidney beans, butter beans, black eyed beans or baked beans)
4 tbsp pulses (chickpeas, lentils etc)
Palm sized portion (140g) of oily fish (mackerel, salmon, herring etc)
Palm sized portion (140g) white or canned fish (drained)
2 eggs
4 tbsp soya/tofu or vegetable-based meat alternative
1 tbsp/ handful of nuts or good quality nut butter