Most adult women need at least 46 grams of protein per day, but that number is a bare minimum. Depending on your age, activity level, and goals, you may benefit from significantly more, often in the range of 60 to 100 grams daily. The official recommendation of 46 grams prevents deficiency, but it wasn’t designed to optimize muscle retention, weight management, or healthy aging.
The Baseline: 46 Grams Per Day
The Recommended Dietary Allowance for adult women ages 19 and older is 46 grams of protein per day, and that number stays the same whether you’re 25 or 65. It’s based on roughly 0.8 grams per kilogram of body weight, calculated for an average-sized woman. For a 140-pound (64 kg) woman, that works out to about 51 grams. For a 120-pound woman, it’s closer to 44 grams.
This baseline keeps your body functioning and prevents protein deficiency. But many nutrition experts now consider it too low for women who want to maintain muscle, lose fat, or stay strong as they age. Think of it as the floor, not the target.
How Much Active Women Need
If you exercise regularly, your protein needs jump well above the baseline. Women who do endurance exercise like running or cycling benefit from 1.2 to 1.4 grams per kilogram of body weight per day. For a 150-pound woman, that’s roughly 82 to 95 grams daily. Strength training pushes the range even higher, typically to 1.4 to 1.6 grams per kilogram, since your muscles need amino acids to repair and grow after lifting.
Even moderate activity like brisk walking, yoga, or recreational sports increases protein turnover in your muscles. If you’re doing any structured exercise several times a week, aiming for at least 1.2 grams per kilogram is a practical starting point.
Protein Needs After Menopause
After menopause, women lose muscle faster due to dropping estrogen levels, a process that accelerates the natural age-related muscle loss called sarcopenia. To counteract this, experts now recommend postmenopausal women aim for 1.0 to 1.2 grams of protein per kilogram of body weight per day. For a 150-pound woman, that’s 68 to 82 grams.
The higher end of that range, 1.2 grams per kilogram, is recommended for women who exercise regularly, are older, or are trying to lose weight while preserving muscle. As Tara Schmidt, lead registered dietitian for the Mayo Clinic Diet, puts it: during menopause, making sure you maintain lean mass is especially important. Protein alone won’t prevent muscle loss, but without enough of it, resistance training and other exercise can’t do their job effectively.
During Pregnancy and Breastfeeding
Protein needs rise gradually through pregnancy. In the first trimester, the increase is minimal, just 1 to 2 extra grams per day above your normal intake. The second trimester bumps that up by about 9 grams daily. By the third trimester, you need roughly 28 to 31 additional grams per day, reflecting the rapid growth happening in those final months. For most women, that means a third-trimester target somewhere around 75 to 80 grams daily.
Breastfeeding is even more demanding. During the first six months of exclusive breastfeeding, you need about 19 extra grams of protein per day. After six months, when your baby starts eating solid foods and nursing less, the extra requirement drops to around 13 grams. Some guidelines suggest breastfeeding women aim for about 1.1 grams per kilogram of body weight daily.
Protein for Weight Loss
Higher protein intake helps with weight loss in two ways: it keeps you fuller longer, and it helps preserve muscle while you’re in a calorie deficit. A study from Carle Illinois College of Medicine found that dieters who increased their protein to about 80 grams per day (alongside 20 grams of fiber and a 1,500-calorie limit) had better weight-loss outcomes than those who didn’t prioritize protein.
Eighty grams is a reasonable target for most women trying to lose weight. It’s high enough to protect muscle mass and control hunger, but achievable without requiring protein shakes at every meal. If you’re larger or more active, you might aim higher. The key is that protein should make up a meaningful portion of each meal rather than being an afterthought.
How to Spread Protein Across the Day
Your body can’t store protein the way it stores carbohydrates or fat. Once your immediate needs are met, extra protein gets used for energy or converted to fat. This means eating 60 grams at dinner and 10 grams at breakfast is less effective than distributing your intake more evenly. Aiming for 20 to 30 grams at each of three meals gives your muscles a steady supply of amino acids throughout the day.
Many women undereat protein at breakfast in particular. A couple of eggs gives you only 12 grams. Pairing them with Greek yogurt (12 to 18 grams per 5-ounce serving) or adding a side of lentils gets you much closer to that 25-to-30-gram-per-meal sweet spot.
What Common Foods Provide
Knowing your target is only useful if you know what’s actually in your food. Here’s a quick reference for common protein sources:
- Chicken, beef, turkey, or pork: 7 grams per ounce (a typical 4-ounce serving delivers 28 grams)
- Eggs: 6 grams each
- Greek yogurt (plain, nonfat): 12 to 18 grams per 5-ounce container
- Lentils: 9 grams per half cup
- Tofu: 3 grams per ounce (a typical 4-ounce serving has about 12 grams)
A day that includes two eggs at breakfast (12 grams), a cup of lentils at lunch (18 grams), Greek yogurt as a snack (15 grams), and a 4-ounce chicken breast at dinner (28 grams) adds up to about 73 grams with minimal effort. Swapping or supplementing with beans, cottage cheese, fish, or edamame gives you plenty of flexibility.
When Protein Becomes Too Much
More than 2 grams per kilogram of body weight per day is generally considered excessive. For a 150-pound woman, that’s over 136 grams. At those levels, the risks start to outweigh the benefits. Excess protein gets stored as fat just like excess calories from any other source. Many high-protein foods also carry saturated fat, which can raise blood lipids and increase heart disease risk over time.
Women with existing kidney issues face additional risk, since processing large amounts of protein taxes the kidneys. For healthy women, staying in the 1.0 to 1.6 grams per kilogram range covers virtually every goal, from basic health to serious athletic performance, without pushing into problematic territory.
Finding Your Number
Your ideal daily protein intake depends on your body weight and what you’re asking your body to do. Here’s a simplified guide using grams per kilogram of body weight:
- Sedentary women: 0.8 g/kg (the RDA minimum)
- Postmenopausal women: 1.0 to 1.2 g/kg
- Women doing regular endurance exercise: 1.2 to 1.4 g/kg
- Women doing strength training or losing weight: 1.2 to 1.6 g/kg
- Third-trimester pregnancy: baseline plus 28 to 31 grams
- Breastfeeding: roughly 1.1 g/kg
To calculate your number, divide your weight in pounds by 2.2 to get kilograms, then multiply by the appropriate range. A 140-pound woman doing regular strength training, for example, would calculate 140 ÷ 2.2 = 64 kg, then 64 × 1.4 = about 90 grams per day. That’s nearly double the RDA, and for her goals, it’s the better target.