Most women need between 46 and 75 grams of protein per day, depending on body weight, age, and activity level. The baseline recommendation is 0.8 grams of protein per kilogram of body weight (or 0.36 grams per pound), but that number is a floor, not a target. For a 150-pound woman, that works out to about 54 grams daily, which is enough to prevent deficiency but likely not enough to thrive.
How to Calculate Your Personal Target
The simplest way to find your starting point is to multiply your body weight in pounds by 0.36. That gives you the minimum grams of protein your body needs each day to maintain basic functions. A 130-pound woman would need at least 47 grams; a 170-pound woman, at least 61 grams.
But that minimum was designed to keep you from getting sick, not to optimize your health. Many nutrition researchers now consider it too conservative for most people. A more practical range for moderately active women falls between 1.0 and 1.2 grams per kilogram of body weight, which translates to roughly 0.45 to 0.55 grams per pound. For that same 150-pound woman, that’s 68 to 82 grams per day.
Protein Needs During Pregnancy and Breastfeeding
Pregnancy increases protein requirements, but not evenly across all nine months. In the first trimester, needs barely change. By the second trimester, you need roughly 9 to 10 extra grams per day above your normal intake. The third trimester brings the biggest jump, with recommendations landing 28 to 31 additional grams per day above your pre-pregnancy baseline. For a woman who normally needs about 55 grams, that could mean 83 to 86 grams daily in late pregnancy.
Breastfeeding keeps protein needs elevated. During the first six months of exclusive breastfeeding, you need about 19 extra grams per day. After six months, when your baby starts eating solid foods and nurses less, that drops to roughly 13 grams extra. Some guidelines put the total recommendation for breastfeeding women at about 1.2 grams per kilogram of body weight per day.
Why Women Over 65 Need More
Aging muscles become less efficient at using dietary protein to repair and rebuild themselves. This gradual loss of muscle mass, called sarcopenia, accelerates after 65 and contributes to frailty, falls, and fractures. To counteract this, researchers recommend older adults consume 1.0 to 1.2 grams of protein per kilogram of body weight daily, which is 25 to 50 percent more than the standard minimum. A 140-pound woman over 65 would aim for 64 to 76 grams per day rather than the baseline 50 grams.
Bone health adds another reason to prioritize protein in later years. Collagen, the most abundant protein in your body, is a major structural component of bones. Getting enough protein alongside calcium and vitamin D helps maintain bone density and reduces fracture risk.
Protein for Active Women and Athletes
If you exercise regularly, you need more protein than someone who is sedentary. For women doing a mix of resistance training and cardio, the recommended range is 1.4 to 1.6 grams per kilogram of body weight per day (roughly 0.6 to 0.7 grams per pound). A 150-pound woman lifting weights several times a week would target about 95 to 109 grams daily.
Endurance athletes have their own demands. Running, cycling, and swimming increase the rate at which your body breaks down amino acids for fuel. Recent research on female endurance athletes suggests targeting around 1.9 grams per kilogram on training days, which is higher than even the upper end of most athletic guidelines. For a 140-pound runner, that’s about 120 grams on hard training days.
During periods of heavy training or calorie restriction, protein needs climb even higher, up to 2.0 to 2.2 grams per kilogram per day. Women who eat mostly plant-based protein sources may need about 10 percent more total protein to compensate for the lower concentration of essential amino acids in plant foods. Spreading your intake evenly across the day, roughly every three to four hours, supports muscle repair better than loading it all into one or two meals.
Protein During Weight Loss
Cutting calories puts your muscle at risk. When your body doesn’t get enough energy from food, it starts breaking down muscle tissue for fuel. Eating more protein is the most effective dietary strategy to prevent this. For women actively losing weight while exercising, research supports intakes of 1.6 to 2.4 grams per kilogram per day. Even for untrained women in a calorie deficit, consuming around 1.3 grams per kilogram alongside a resistance training program has been shown to produce better fat loss while preserving or even gaining lean mass.
Higher protein intake during weight loss also helps with satiety. Protein is the most filling macronutrient, so meals built around it tend to keep hunger at bay longer than meals centered on carbohydrates or fat. Beyond about 2.4 grams per kilogram per day, though, additional protein doesn’t appear to offer extra muscle-sparing benefits.
Signs You’re Not Getting Enough
Mild protein shortfalls don’t always announce themselves dramatically, but your body does send signals. Hair that becomes brittle, breaks easily, or starts shedding faster than usual can point to inadequate intake. Dry, pale skin is another early indicator. You might notice that cuts and minor injuries heal more slowly, or that you catch colds and infections more often, since your immune system relies on protein to produce antibodies.
More significant deficiency leads to visible muscle loss, persistent fatigue, and unexplained weight changes in either direction. Losing muscle slows your metabolism, which can paradoxically cause weight gain over time even if you’re not eating more. In severe cases, low protein leads to swelling in the hands and legs because the body can’t produce enough of the blood proteins that regulate fluid balance. Bone fractures from minor impacts can also signal chronically low intake.
How Much Is Too Much
More than 2 grams per kilogram of body weight per day is generally considered excessive for non-athletes. Your body can’t store protein the way it stores fat or carbohydrates. Once your needs are met, extra protein gets converted to energy or stored as fat, just like excess calories from any other source.
Very high protein diets can also strain the kidneys over time, particularly if you have any predisposition to kidney problems. And the source matters: if your extra protein comes primarily from red and processed meats, you may be increasing your intake of saturated fat along with it, which raises heart disease risk. Swapping refined carbohydrates for protein is a net positive, but loading up on bacon and sausage to hit a number defeats the purpose.
Putting It Into Meals
Knowing your target number is only useful if you can picture what it looks like on a plate. One large egg provides about 6 grams of protein. A half cup of firm tofu delivers roughly 22 grams. Two slices of roasted chicken breast add about 7 grams. A cup of cooked lentils runs around 18 grams. A container of Greek yogurt typically provides 15 to 20 grams, depending on the brand.
For a woman targeting 70 grams per day, a realistic day might look like two eggs at breakfast (12 grams), a lentil-based soup at lunch (18 grams), Greek yogurt as a snack (17 grams), and a palm-sized portion of chicken or tofu at dinner (22 to 25 grams). That puts you squarely in range without supplements or protein shakes, though those are perfectly fine tools if whole foods don’t fit your schedule.
If you’re increasing your protein intake, keep in mind that calories still matter. Adding protein means something else on your plate needs to shrink. Replacing refined carbohydrates like white bread, pasta, or sugary snacks with protein-rich foods is the simplest swap and the one most likely to improve your overall nutrition at the same time.