Most women eat significantly less protein than their muscles, hormones, and immune system require. Here is how to close the gap with real food and realistic meals.
The protein conversation has been captured by people who enjoy weighing chicken breasts, which has left everyone else with the impression that eating enough is a lifestyle rather than a number. It is a number, and it is not a large one. The gap between what most women eat and what the research supports is usually around 30 grams a day — roughly one meal’s worth, concentrated in the meal most people skip past.
What 0.8 g/kg actually means
The recommended dietary allowance for protein is 0.8 grams per kilogram of bodyweight. For a 65 kg woman that is about 52 grams a day, and it is widely treated as a target.
It is not one. The RDA was derived from nitrogen balance studies designed to establish the amount that prevents deficiency in the vast majority of healthy adults. That is a different question from how much supports muscle maintenance, recovery, satiety, or healthy ageing. Using it as a goal is like treating the minimum legal tyre tread as the depth you should aim for.
What the research supports instead
For adults who want to maintain muscle rather than merely avoid deficiency, the evidence points considerably higher. Meta-analysis of resistance training studies places the point of diminishing returns for muscle gain at around 1.6 g per kg of bodyweight daily — for a 65 kg woman, roughly 105 grams.
For older adults the case is stronger, not weaker. Ageing muscle shows anabolic resistance: it responds less to a given dose of protein, so requirements rise rather than fall. An international expert consensus recommends 1.0 to 1.2 g/kg for healthy older adults, and more for those who are ill or recovering — notably above the RDA that most guidance still quotes at them.
Somewhere between 1.2 and 1.6 g/kg covers most women who exercise, are over 40, are losing weight, or simply want to keep the muscle they have. The lower end of that is around 80 grams a day for a 65 kg woman. Achievable without a single shake.
The distribution problem
Total intake is only part of it. The typical Western pattern is heavily skewed toward the evening: a breakfast of toast or cereal supplying perhaps 8 grams, a moderate lunch, and a dinner carrying 40 grams or more.
This matters because muscle protein synthesis responds to a threshold rather than to a running total. Research suggests roughly 25 to 30 grams in a meal is needed to maximally stimulate it in younger adults, and more in older ones. A study comparing the same daily total distributed evenly across three meals against the usual skewed pattern found higher 24-hour muscle protein synthesis with even distribution.
The practical translation is unusually specific: breakfast is where almost all the missing protein is. Fixing that one meal typically closes most of the gap without changing anything else.
Where the grams actually are
- Greek yoghurt, 150g pot — around 15g, and closer to 20g in the thicker strained versions
- Two eggs — around 12g
- Cottage cheese, 100g — around 11g
- Chicken breast or salmon fillet, 100g cooked — around 25–30g
- Tinned tuna or sardines, one tin — around 20–25g
- Lentils or chickpeas, 100g cooked — around 8–9g
- Firm tofu, 100g — around 14g; edamame, 100g — around 11g
- Milk, 250ml — around 8g; cheddar, 30g — around 7g
A breakfast of Greek yoghurt with nuts and berries lands near 20 grams where toast and jam lands near 5. Two eggs on the same toast gets you to roughly 18. Adding a tin of tuna or a scoop of lentils to a lunchtime salad moves it from 10 grams to 30. None of this requires a meal plan — it requires noticing that three of your meals were built without protein in mind.
The RDA is the amount that prevents deficiency, not the amount that produces good outcomes. Those are different questions.
— WellnessLife editorial
Plant sources and the combining myth
Plant proteins are generally lower in leucine, the amino acid most responsible for triggering muscle protein synthesis, and several are lower in one or more essential amino acids. The practical consequence is that people eating mostly or entirely plant-based diets should aim toward the higher end of the intake range rather than the lower.
What is not required is the old rule about combining complementary proteins within a single meal. That idea was popularised in the 1970s and subsequently withdrawn by its own author. The body maintains a pool of circulating amino acids, so what matters is the variety across the day rather than the composition of any one plate. Soy and pea protein are also more complete than the general rule about plant sources implies.
The kidney question
The most persistent worry about higher protein intake is kidney damage, and in healthy people it is not supported. A systematic review and meta-analysis found no difference in kidney function between adults consuming higher-protein and normal-protein diets.
The caveat is specific rather than general: people with existing chronic kidney disease are often advised to restrict protein, and that advice stands. The extrapolation from “restricted in kidney disease” to “damaging in healthy people” is the error, and it is a common one.
The practical takeaway
Work out your rough target — bodyweight in kilograms multiplied by 1.2 to 1.6 — then ignore it for a week and just look at where your protein currently sits at each meal. For most women the answer is that dinner is fine and breakfast is close to empty, which makes the fix a single swap rather than a diet.
Three things worth holding onto. Aim for something in the region of 25 to 30 grams at each main meal rather than hitting the total any way you can. Add rather than subtract — this is a question of building meals around a protein source, not of removing anything. And if counting grams starts feeling like an anxious project rather than a useful one, drop the arithmetic and keep the principle: protein at breakfast, protein at lunch, and you will land close enough.
Sources
- Morton RW, Murphy KT, McKellar SR, et al. “A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults.” British Journal of Sports Medicine, 2018.
- Bauer J, Biolo G, Cederholm T, et al. “Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group.” Journal of the American Medical Directors Association, 2013.
- Mamerow MM, Mettler JA, English KL, et al. “Dietary protein distribution positively influences 24-h muscle protein synthesis in healthy adults.” Journal of Nutrition, 2014.
- Moore DR, Churchward-Venne TA, Witard O, et al. “Protein ingestion to stimulate myofibrillar protein synthesis requires greater relative protein intakes in healthy older versus younger men.” Journals of Gerontology: Series A, 2015.
- Devries MC, Sithamparapillai A, Brimble KS, et al. “Changes in kidney function do not differ between healthy adults consuming higher- compared with lower- or normal-protein diets: a systematic review and meta-analysis.” Journal of Nutrition, 2018.
