Health Reference LibraryHow much protein do you need? UK numbers and how to hit them
This entry is part of the Nutri Tailor Health Reference Library — cited research on supplements, nutrients and adjacent areas of health.
Summary
Start from the UK reference nutrient intake of 0.75g of protein per kilogram of body weight per day: 45g for a 60kg adult, 56g at 75kg. That figure is the level judged sufficient to avoid deficiency, not a performance target. Regular training moves the evidence-based range to 1.4 to 2.0g per kilogram per the international position stand, and older adults do better around 1.2g per kilogram with at least 25g of protein at three separate meals, a pattern fewer than 15% of UK over-65s currently reach. UK advice since 1991 is to keep total intake below twice the reference value, so the working ceiling for most adults is about 1.5g per kilogram unless training justifies more.
How it works
Muscle protein is in constant turnover, and intake has two separate jobs: covering the daily requirement, which the reference intake handles, and triggering muscle protein synthesis at each meal, which responds to per-meal dose. That is why the situational evidence talks in two currencies, grams per kilogram per day for the total and grams per meal for the trigger, and a good plan sets both.
Effective dose
The UK reference nutrient intake is 0.75g per kilogram of body weight per day (Department of Health, 1991), which the British Nutrition Foundation works through as 45g a day at 60kg and 55.5g at 74kg, with an extra 6g a day in pregnancy and 11g in the first six months of breastfeeding. For regular training, the international position stand puts the range at 1.4 to 2.0g per kilogram (Jager 2017). For adults over 65, the age-specific recommendation used in UK research is 1.2g per kilogram (Morris 2020). Average UK intakes already run at about 85g a day for men and 67g for women, so many people start closer to their target than they think.
Forms compared
Food does the bulk of the work, and a protein powder is a convenience for the meals where the numbers do not add up, most often breakfast. An unflavoured whey isolate slots into porridge, yoghurt or a shake without changing what the meal tastes like.
Timing
Distribution matters most for older adults and for anyone training: the evidence threshold is roughly 25g of protein at three separate meals for muscle protein synthesis in over-65s (Morris 2020), and the position stand recommends 0.25g per kilogram, or an absolute 20 to 40g, per serving spread evenly through the day (Jager 2017). The most common UK gap is a low-protein breakfast, and moving intake earlier is the single easiest improvement the UK data points at.
Safety profile
UK advice dating from the 1991 reference values is to avoid intakes above twice the reference level, roughly 1.5g per kilogram for most adults, and the European Food Safety Authority concluded in 2012 that data were insufficient to set a formal upper level. The training range of 1.4 to 2.0g per kilogram is well studied in healthy exercising adults. Anyone with kidney disease sets protein targets with their GP or renal team, not from a general guide.
Special populations
Adults over 65 are the group most likely to fall short: in the South Yorkshire food-diary study of 256 older adults, fewer than half met even the 0.75g reference level, fewer than 15% met the 1.2g age-specific level, and only one person managed 25g at three meals (Morris 2020). Pregnancy adds 6g a day and breastfeeding 11g in the first six months per the UK reference values. Kidney conditions change the rules entirely and belong with the GP.
Interactions
No supplement-style interactions apply to protein as a food. The practical point is displacement: very high protein targets crowd out other foods, which is one reason the UK twice-the-reference advice exists.
Guideline positions
UK Dietary Reference Values (Department of Health, 1991), presented by the British Nutrition Foundation: reference nutrient intake 0.75g per kilogram per day, pregnancy and lactation additions, and the advice to avoid more than twice the reference intake; EFSA 2012 found data insufficient for a formal upper level. Jager 2017, the international position stand on protein and exercise: 1.4 to 2.0g per kilogram daily for exercising individuals, 0.25g per kilogram or 20 to 40g per serving, evenly distributed. Morris 2020, Geriatrics: UK older adults measured against 0.75g, 1.2g and the 25g-by-three-meals threshold.
Practical framework
Build the plan in four steps. One, pick your lane: 0.75g per kilogram as the floor for a sedentary adult, 1.2g for over-65s, 1.4 to 2.0g for regular training. Two, do the arithmetic against your own weight and write down the daily grams. Three, divide by three meals and check each hits roughly 25 to 40g; the meal that fails is almost always breakfast. Four, close the gap with food first, and where a meal stubbornly will not add up, a 25g scoop of unflavoured whey is the simplest patch, the worked example on our shelf at nutritailor.co.uk/products/unflavoured-whey-protein-powder. Kidney conditions send the whole plan to the GP first.
Common misconceptions
That the reference intake is a target for everyone: it is the level judged sufficient to avoid deficiency, and the training and older-adult evidence sits well above it. That more protein always builds more muscle: the position stand range tops out at 2.0g per kilogram for most exercising people, with higher intakes reserved for specific dieting phases. That timing beats totals: total daily intake matters most, and distribution is the refinement, not the foundation.
Sources
- British Nutrition Foundation 2026. Nutrition information about protein and plant-based protein. British Nutrition Foundation (nutrition.org.uk).
- Jager R, Kerksick CM, Campbell BI, et al 2017. International Society of Sports Nutrition Position Stand: protein and exercise. Journal of the International Society of Sports Nutrition 14:20, DOI 10.1186/s12970-017-0177-8, PMID 28642676.
- Morris S, Cater JD, Green MA, Johnstone AM, Brunstrom JM, Stevenson EJ, Williams EA, Corfe BM 2020. Inadequacy of Protein Intake in Older UK Adults. Geriatrics 5(1):6, DOI 10.3390/geriatrics5010006.