Quick Answer: Women need a baseline of 0.8 grams of protein per kilogram of body weight per day to meet basic nutritional needs and help prevent deficiency. But that number is only a starting point. Your ideal protein intake can be higher depending on your age, activity level, lifestyle, and goals, including muscle maintenance or weight loss.
How Much Protein Do Women Actually Need?
The thing about protein is that there’s no single number every woman should be chasing. Daily protein intake for women depends on a mix of factors: your age, body size, activity level, and what you actually want protein to do for you.
And those needs don’t exactly stay put. The amount that works when you’re relatively sedentary may look different once you start strength training, and protein needs for active women can shift depending on the type and demands of their workout. Age changes the conversation, too, particularly when it comes to maintaining muscle and strength over time.
So, rather than treating protein like another daily number to obsess over, it helps to understand what’s actually shaping yours. Ahead, we break down the guidelines and when you might need to go beyond them.
The Official Recommendation and Why It’s Not Enough
Here’s the number you’ll see most often: 0.8 grams of protein per kilogram of body weight per day. That’s the Recommended Dietary Allowance (RDA) for healthy adults, [1] which works out to about 51 grams a day for a 140-pound woman.
But there’s an important distinction hiding behind that number. The RDA is designed to cover the needs of nearly all healthy adults to avoid malnutrition or deficiency. It isn’t necessarily a personalized target for feeling your strongest, supporting a demanding training routine, or maintaining muscle mass as you age.
That’s where the conversation around daily protein intake for women gets more nuanced. Research suggests that women who exercise regularly may benefit from higher protein intakes, while factors such as age and life stage can change the equation, too. [2] In other words, 0.8g/kg is a useful reference point, but it just shouldn’t automatically be treated as the perfect number for every woman.
How Much Protein Do Women Actually Need Per Day?
So, what does “enough” actually look like on your plate? There’s no universal protein prescription for women, but there are useful ranges based on your body weight, activity level, and goals. Here’s where you might fall.
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Sedentary Women |
0.8-1.0g/kg/day |
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Active Women |
1.2-1.6g/kg/day |
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Women over 40 |
1.0-1.2g/kg/day |
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Women looking to lose weight |
1.6-2.0g/kg/day |
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Sedentary Women: If most of your day is spent sitting and you do little to no structured exercise, you’d generally fall into the sedentary camp. Think desk-heavy days without regular strength training, running, or other demanding workouts. In that case, protein needs tend to sit toward the lower end of the spectrum, with 0.8g/kg per day serving as the standard baseline for healthy adults.
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Active Women: If you exercise regularly, your protein needs start to move beyond the standard baseline. A practical range is around 1.2–1.6 g/kg per day, with research in recreationally active and athletic women finding protein requirements that generally fall within this neighborhood. [2]
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Women over 40: While turning 40 doesn’t suddenly rewrite your protein requirements, maintaining muscle becomes increasingly important with age, particularly through the menopausal transition and beyond. The European Society for Clinical and Economic Aspects of Osteoporosis and Osteoarthritis (ESCEO) recommends a protein intake of around 1.0–1.2 g/kg per day at each main meal for healthy older and postmenopausal adults. [3]
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Women looking to lose weight: When you’re actively losing weight, protein becomes especially important since eating fewer calories can also put you at risk of losing muscle. Aiming for around 1.6 grams of protein per kilogram of body weight per day can help support lean mass during weight loss. [4] For people with a BMI over 30, protein needs may instead be calculated using adjusted body weight rather than actual body weight.
How much protein you need starts with your body weight, then shifts with your lifestyle, age, and goals. For example, at the 0.8 g/kg baseline, a 65-kilogram (143-pound) woman would land at about 52 grams of protein per day, with the ranges above showing how that number can climb from there.
Why Protein Needs Change After 40
Forty isn’t exactly a biological deadline, but when it comes to muscle, the groundwork has already been laid. Age-related muscle loss can begin as early as our 30s, with adults gradually losing an estimated 3–5% of muscle mass per decade. [5] At first, the change may be subtle; by around 60, it tends to become much more noticeable and continues as we age. When that decline becomes significant enough to affect muscle mass, strength, and function, it’s known as sarcopenia.
There’s another catch. As we age, our muscles don’t respond to protein quite as enthusiastically as they once did. This is called anabolic resistance, which is essentially a very science-y way of saying that the body may need a stronger nudge to kick-start the muscle-building and repair process.
This is where eating enough protein starts to matter beyond hitting a nutrition goal for the day. Protein provides the amino acids your muscles need to repair and maintain themselves, while strength training gives them a reason to stick around. And that muscle is worth protecting: it plays a role in everything from strength and mobility to bone and metabolic health.
None of this means 40 arrives with an overnight change in your protein requirements. Think of it more as the point when being intentional about protein starts paying increasingly important dividends, both for the muscle you have now and the muscle you’d very much like to keep.
Protein and Weight Management
Protein won’t do the weight-loss work for you, but it can make the process a little more cooperative. It’s particularly satiating, helping you stay fuller for longer, which could be a useful advantage when you’re eating fewer calories than usual.
It can also help preserve lean muscle during a calorie deficit, so more of the weight you lose comes from fat rather than muscle. And there’s a small metabolic perk: protein is the most thermogenic macronutrient, [6] meaning your body uses more energy to digest, absorb, and process it than it does carbohydrates or fat.
None of these effects makes protein a shortcut to weight loss. But for managing hunger, holding onto muscle, and getting a little more mileage out of digestion, it certainly earns its place on the plate.
Signs You May Not Be Getting Enough Protein
Protein intake isn’t always something you can gauge by looking at your plate. While these signs can have plenty of other causes, they may be worth paying attention to if your diet has been consistently low in protein.
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Persistent fatigue or slow recovery after exercise
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Loss of muscle tone or strength over time
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Frequent hunger even after meals
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Hair thinning or brittle nails [7]
How To Get Enough Protein on a Plant-Based Diet
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Prioritize high-protein whole foods: Make protein the starting point of the meal. Lentils, tofu, edamame, tempeh, and quinoa all deliver a meaningful amount of plant protein while bringing fiber, vitamins, and minerals along with them.
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Use protein powder as a convenient complement: Protein powder can help close the gap on days when hitting your target through meals alone feels like a stretch. Think of it as a supporting player rather than the main event; whole foods should still do most of the heavy lifting.
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One serving can pack a punch: A single serving of plant-based protein powder, such as Warrior Blend, can provide a convenient source of clean, plant-based protein to help support daily protein goals, making it an easy way to help move you closer to your daily target without overcomplicating your meals.
Frequently Asked Questions
Is 50g of protein a day enough for a woman?
It can be. At the standard recommendation of 0.8 g/kg per day, 50 grams would cover the baseline needs of a woman weighing about 62.5 kilograms (138 pounds). Women who are more active, older, or trying to preserve muscle during weight loss may need more, so the better question is whether 50 grams is enough for your body and lifestyle.
Can you get too much protein?
Yes, although there isn’t one universal cutoff where protein suddenly becomes “too much.” For most healthy adults, higher-protein diets are generally well tolerated, but piling on more protein than you need doesn’t necessarily bring extra benefits, and can crowd out fiber-rich foods and other nutrients. If you have kidney disease or another medical condition that affects protein needs, it’s best to discuss your intake with a healthcare professional.
Does protein timing matter for women?
No, not nearly as much as getting enough protein over the course of the day. Your body doesn’t stop benefiting from protein because you missed a narrow “window,” so there’s no need to obsess over the clock. Focus on meeting your daily needs and getting protein regularly across your meals.
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Authority & Reviewer
Reviewed by Sal Abraham, PhD, MS, RDN, LDN
Sal Abraham, PhD, MS, RDN, LDN, is a Registered Dietitian Nutritionist and Licensed Dietitian Nutritionist with over 30 years of experience across the dietary supplement, functional food, and sports nutrition industries. He holds a BS and MS in Nutrition and a PhD in Health Sciences. Sal currently serves as Vice President of Quality, Regulatory, and Scientific Affairs, overseeing scientific strategy, regulatory compliance, and quality systems for dietary supplements and functional foods. He is an active member of the Academy of Nutrition and Dietetics' Sports, Cardiovascular & Wellness Nutrition group, the International Society of Sports Nutrition, Dietitians in Integrative and Functional Medicine (DIFM), and the National Strength & Conditioning Association. Sal reviews Sunwarrior's protein and sports nutrition content for scientific accuracy.
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