Protein in a woman's diet: how much do you really need and how to plan it well?
Sonia Biecka
Dietitian
Introduction
Protein is one of the most important nutrients in a woman's diet, yet in practice it usually shows up in one of two extremes: either there is too little of it, or it is treated purely as a supplement for building muscle, boosting metabolism or improving hormonal health. The truth is a little different: the right amount of protein helps maintain muscle mass and supports satiety, recovery, immunity, bone health and body composition, but it works best as part of a well-balanced diet, not as its only foundation.
Current guidelines for healthy adult women set the baseline requirement at around 0.8 g of protein per kg of body weight per day according to US standards, and 0.83 g/kg according to EFSA. This level was established for healthy adults in stable conditions, without heavy training loads, weight reduction, pregnancy, lactation or older age.
In practice, many women benefit from the higher end of the range, especially if they train, are losing weight, are over 50 or want to improve body composition.
| Situation | Practical protein recommendation |
|---|---|
| Healthy adult woman, low activity | 0.8 to 1.0 g/kg bw/day |
| Regular activity, recreational training | 1.2 to 1.6 g/kg bw/day |
| Strength training, building or maintaining muscle (ISSN) | 1.4 to 2.0 g/kg bw/day |
| Weight reduction (ESPEN) | 1.6 to 2.2 g/kg bw/day |
| Women over 60 (ESPEN) | minimum 1.0 g/kg bw/day, often 1.0 to 1.2 g/kg |
| Pregnancy (NCBI Bookshelf) | approx. 1.1 g/kg bw/day or approx. 71 g/day per RDA |
| Lactation (NCBI Bookshelf) | approx. 1.3 g/kg bw/day or approx. 71 g/day per RDA |
Why do women often need more than the minimum?
Minimum requirements do not account for many situations typical of everyday life: workouts, a calorie deficit, working on body composition, age-related muscle loss or a greater need for satiety. A meta-analysis by Morton et al. showed that protein supplementation combined with resistance training supports gains in lean body mass and strength, with muscle benefits peaking around 1.6 g/kg of body weight per day.
For women it also matters that muscle mass is not only about appearance. It is metabolically active tissue that influences fitness, insulin sensitivity, metabolic rate, bone health and the quality of ageing. After 40 and 50, maintaining muscle becomes increasingly important, especially in combination with strength training.
Protein and weight loss
Weight reduction is not just about the number on the scale going down. The goal is to lose mostly fat tissue while preserving as much muscle as possible. A higher protein intake can help, because protein increases satiety, has a higher thermic effect than fats and carbohydrates, and supports the maintenance of lean body mass.
A 2024 systematic review and meta-analysis in people with overweight or obesity showed that increased protein intake helps limit muscle loss during weight reduction. The authors indicated that intakes above 1.3 g/kg/day may be more beneficial for preserving muscle than lower levels.
How to spread protein across the day?
The biggest mistake is eating very little protein in the morning and catching up on everything at dinner. For satiety, recovery and muscle protein synthesis, it is better to distribute it evenly, with 20-35 g of protein in each individual meal.
A practical scheme:
Example for a physically active woman weighing 65 kg: a target of 1.6 g/kg means about 104 g of protein per day. This can be split into 4 servings of about 25 g each.
The best protein sources
It is worth combining animal and plant sources in the diet. Animal products usually have a complete amino acid profile and high digestibility. Plant products additionally provide fibre, polyphenols, magnesium and potassium, but often require more variety.
| Product | Approximate protein content |
|---|---|
| Chicken breast, 100 g cooked | approx. 28 to 31 g |
| Salmon, 100 g | approx. 20 to 25 g |
| Eggs, 2 pieces | approx. 12 to 14 g |
| Plain skyr, 150 g | approx. 15 to 18 g |
| Semi-skimmed curd cheese, 150 g | approx. 25 to 30 g |
| Tofu, 180 g | approx. 20 to 25 g |
| Cooked lentils, 200 g | approx. 16 to 18 g |
| Cooked chickpeas, 200 g | approx. 16 to 18 g |
| Protein powder, 1 serving | usually 20 to 25 g |
Is protein powder necessary?
No. Protein powder is a tool, not an obligation. It can be helpful if a woman struggles to hit her protein target from meals, eats little in the morning, trains and needs a convenient snack, or is dieting and wants more satiety without a large volume of food.
It is worth choosing products with a simple composition, without much sugar and with a well-tolerated type of protein. For women with lactose intolerance, whey protein isolate, plant protein or pea and rice blends may work better.
Summary
For a healthy adult woman, the absolute starting point is about 0.8 g of protein per kg of body weight per day - and this is the bare minimum. In practice it depends on physiological state and physical activity level; for women who are active, strength train, are losing weight or are perimenopausal, a higher intake is usually recommended, most often in the range of 1.2 to 2.0 g/kg/day.
The best results come not from simply "hitting your protein", but from spreading it well across the day, choosing quality sources and combining it with strength training, sleep, appropriate calorie intake and a fibre-rich diet. Protein is one of the most practical tools in a woman's diet.
Frequently asked questions
How much protein does a woman need per day?
The baseline requirement for a healthy adult woman is about 0.8 g of protein per kg of body weight per day. Women who are active, strength train, are losing weight or are over 50 usually benefit from a higher range, most often 1.2 to 2.0 g/kg per day.
How should protein be spread across the day?
Evenly, with 20-35 g of protein in each meal, rather than catching up at dinner. Example: a woman weighing 65 kg with a target of 1.6 g/kg needs about 104 g of protein per day, which works out to 4 servings of about 25 g each.
Is protein powder necessary?
No, it is a tool, not an obligation. It can help when it is hard to reach the protein target from meals, breakfasts are small or during weight loss. Choose products with a simple composition and little sugar; with lactose intolerance, whey isolate or plant protein may work better.
References
- Institute of Medicine, Dietary Reference Intakes, recommended macronutrient intake table NCBI Bookshelf.
- EFSA, Population Reference Intakes for protein EFSA.
- Jäger R. et al., International Society of Sports Nutrition Position Stand: protein and exercise Journal of the International Society of Sports Nutrition.
- Morton R.W. et al., Protein supplementation and resistance training, systematic review and meta-analysis British Journal of Sports Medicine.
- Sims S.T. et al., ISSN Position Stand: nutritional concerns of the female athlete PubMed.
- Volkert D. et al., ESPEN practical guideline: Clinical nutrition and hydration in geriatrics ESPEN.
- Kokura Y. et al., Enhanced protein intake on maintaining muscle mass in adults with overweight or obesity, systematic review and meta-analysis PubMed.