Protein has become one of the most heavily marketed nutrients around, attached to everything from snack bars to breakfast cereal — which makes the actual, unglamorous reference number worth stating plainly, since it tends to get lost under the marketing.
The baseline number
UK reference intakes work out to roughly 0.75 grams of protein per kilogram of body weight per day for most healthy adults. In concrete terms, that’s around 45g a day for a 60kg (about 9.5 stone) woman, or 55g a day for a 75kg (about 11.8 stone) man — figures reflected in UK nutrition labelling reference intakes of 45g for women and 55g for men. For most people eating a varied diet, this is a genuinely achievable amount without deliberate effort, let alone supplementation.
Why this number is a baseline, not a ceiling
It’s worth being clear about what this figure represents: a reference intake calculated to meet the needs of most healthy adults, not a universal target everyone should aim to exceed. A number of factors can shift individual protein needs upward, including:
- Age over 40, when the body’s efficiency at using dietary protein for muscle maintenance may reduce somewhat, making adequate intake more relevant to preserving muscle
- Pregnancy and breastfeeding, both of which increase protein requirements
- Menopause, associated with an increased risk of muscle loss
- Higher levels of physical activity, particularly regular strength training, which increases the amount of protein the body can use for muscle repair and maintenance
None of this means the baseline figure is wrong for people without these factors — it means “how much protein do I need” doesn’t have a single universal answer, and the reference intake is a sensible starting point rather than a number to override by default.
Common food sources, and how the numbers add up
Protein doesn’t need to be tracked precisely for most people, but it helps to have a rough sense of where it comes from: legumes (beans and pulses), dairy, eggs, fish, and meat are all significant sources, and current guidance recommends eating these across two or three meals a day rather than concentrating protein into a single meal. A day that includes eggs at breakfast, a source of beans or fish at lunch, and a portion of meat, fish, or a plant-based alternative at dinner, comfortably reaches the reference intake for most people without any special planning or supplementation.
Is there an upper limit worth knowing about?
Yes — UK guidance advises against consuming more than roughly twice the recommended daily intake on a sustained basis. This isn’t about immediate danger from a slightly high-protein day; it reflects general caution about very high, sustained protein intake, particularly for people with existing kidney conditions, where high protein intake can place additional strain on kidney function. For otherwise healthy adults without kidney issues, moderately exceeding the baseline (as often happens naturally with a diet that includes regular meat, fish, and dairy) isn’t generally a concern — it’s specifically very high, sustained intake, well above typical dietary levels, that the caution applies to.
Why “more protein” isn’t automatically the answer
Protein marketing often implies that more is straightforwardly better, but the evidence doesn’t really support that framing for people already meeting their needs through a varied diet. Beyond a certain point, additional protein isn’t stored as muscle — muscle growth specifically requires a training stimulus (which is why strength training and protein needs are closely linked topics, not separate ones) — and excess protein is simply used for energy or excreted, rather than providing extra benefit. The genuinely useful question isn’t “how do I maximise my protein intake,” but “am I reliably meeting my actual needs,” which for most people eating a reasonably varied diet, the answer is already yes.
Plant-based sources and protein quality
For people eating a largely or entirely plant-based diet, it’s worth knowing that plant protein sources (legumes, grains, nuts, seeds) individually may lack one or more of the essential amino acids found together in animal protein — but eating a varied mix of plant sources across the day reliably covers this, without needing to deliberately “combine” proteins within the same meal, as older nutrition advice sometimes suggested.
A practical way to check your own intake
Rather than weighing food or counting grams, a reasonably reliable rough check is to notice whether most meals include a distinct protein source — a portion roughly the size of your palm of meat, fish, eggs, dairy, or a plant-based equivalent like beans or lentils. Someone eating three meals a day that each include a source like this, without any deliberate tracking, is very likely already meeting the reference intake comfortably, which is precisely why formal protein tracking is unnecessary for most people without a specific reason to do it, such as a particular training goal or a diagnosed nutritional concern.
Why timing gets more attention than the evidence fully supports
Some fitness and wellness content places heavy emphasis on protein timing — the idea that protein must be consumed within a specific window after exercise to be effective. The evidence here is more modest than the marketing suggests: total daily protein intake, spread reasonably across the day, matters considerably more than hitting a precise post-exercise window. For most people, including those doing regular strength training, eating protein sources across two or three meals a day — as UK guidance already recommends for general reasons — comfortably covers what’s needed, without requiring a specific supplement or precisely timed meal immediately after a workout.
When it’s worth professional guidance
If you have a diagnosed kidney condition, are managing your protein intake for a specific medical reason, or are significantly increasing your training load and want tailored guidance, that’s a conversation worth having with a GP or registered dietitian rather than relying on general reference intakes alone.
The practical takeaway
For most healthy adults eating a varied diet, UK reference protein intakes — roughly 45g for women and 55g for men per day — are already comfortably met without special effort, and the marketing-driven push toward “more protein” doesn’t reflect what the evidence actually supports for people already meeting their needs. The more useful question is whether your diet reliably includes protein sources across the day, not how much you can add on top.
Sources: British Heart Foundation — Protein: how much do you need?, University Hospitals Sussex NHS Foundation Trust — Protein fact sheet
