Most women need between 1.2 and 1.6 grams of protein per kilogram of body weight per day, which works out to roughly 82 to 109 grams for a 150-pound person. That range comes from the 2025–2030 Dietary Guidelines for Americans, which increased the recommendation by 50 to 100% over the old standard of 0.8 grams per kilogram. The old number represented a minimum to prevent deficiency, not an amount for optimal health. Your ideal intake within (or above) that range depends on your age, activity level, and whether you’re pregnant or breastfeeding.
The Updated Baseline
For years, the standard recommendation was 0.8 grams of protein per kilogram of body weight, or about 0.36 grams per pound. For a 140-pound woman, that came out to roughly 50 grams a day. Many nutrition experts considered that number too low for anything beyond basic survival, and the latest federal dietary guidelines now reflect that. The new range of 1.2 to 1.6 grams per kilogram puts the same 140-pound woman at 76 to 102 grams daily.
To calculate your own target, divide your weight in pounds by 2.2 to get kilograms, then multiply by 1.2 for the lower end and 1.6 for the upper end. If you weigh 170 pounds, that’s about 77 kilograms, giving you a range of 93 to 124 grams per day.
Protein Needs by Activity Level
If you’re mostly sedentary, the lower end of the general range (1.2 g/kg) is a reasonable target. If you strength train, run, cycle, or do other regular exercise, your needs go up. Current sports nutrition guidelines recommend 1.4 to 2.0 grams per kilogram for active women, with the sweet spot for muscle building and maintenance around 1.4 to 1.6 g/kg.
During periods of heavy training or calorie restriction (like cutting for a competition or intentional fat loss), intakes up to 2.2 g/kg may help preserve lean muscle mass. Female endurance athletes may benefit from roughly 1.9 g/kg on training days, which actually exceeds the upper end of most general athletic guidelines. The takeaway: if you’re working out hard, you likely need more protein than you think, especially if you’re also eating fewer calories overall.
How Protein Needs Change With Age
After menopause, muscle loss accelerates. Women over 50 lose muscle mass faster partly because their bodies become less efficient at using dietary protein to repair and build tissue. Mayo Clinic experts recommend women in this stage aim for 1.0 to 1.2 grams per kilogram daily, with the higher end for those who exercise regularly, are older, or are trying to lose or maintain weight. For a 160-pound postmenopausal woman, that translates to roughly 73 to 87 grams a day.
Hitting this target consistently matters more with age because the consequences of falling short are more serious: loss of bone density, reduced strength, greater fall risk, and slower recovery from illness or surgery.
Pregnancy and Breastfeeding
Protein needs increase during pregnancy, but not evenly across all nine months. In the first trimester, you only need about 1 extra gram per day above your normal intake. The second trimester bumps that up by about 9 grams, and the third trimester requires roughly 28 to 31 additional grams daily, when the baby’s growth is most rapid.
During breastfeeding, aim for about 19 extra grams per day in the first six months. After six months, when most babies are also eating some solid food, the additional need drops to around 13 grams. These numbers are on top of your usual baseline, so a breastfeeding woman who would normally target 90 grams should aim for closer to 109 grams in the early months postpartum.
Protein and Weight Management
Protein is the most satiating macronutrient, and the research bears that out in specific numbers. In a study of overweight women, those who ate a higher-protein diet (about 124 grams per day, making up 23% of total calories) experienced 16% less hunger, 25% greater fullness, and 15% fewer fast-food cravings compared to women eating a normal-protein diet. Those differences showed up during everyday, free-living conditions, not just in a lab.
If you’re trying to lose fat while preserving muscle, protein becomes even more important. Calorie deficits put your body in a state where it breaks down both fat and muscle for energy. Higher protein intake (1.6 g/kg and above) helps tip the balance toward fat loss while protecting the lean tissue that keeps your metabolism running.
How to Spread Protein Across the Day
Your body can only use so much protein at once for muscle repair. The threshold to flip the switch from muscle breakdown to muscle building is about 3 grams of leucine, an amino acid found in roughly 30 grams of high-quality protein. That means eating 90 grams of protein in one meal and skipping it the rest of the day is far less effective than spreading it across three or four meals with at least 25 to 30 grams each.
A practical approach: aim for 30 grams at breakfast (Greek yogurt with nuts, or eggs with cheese), 30 grams at lunch (chicken, fish, or a bean-heavy salad), and 30 grams at dinner, with a protein-rich snack if your daily target is higher. Many women undereat protein at breakfast and lunch, then try to make it up at dinner, which leaves their bodies in a breakdown state for most of the day.
Signs You’re Not Getting Enough
Mild protein shortfalls don’t always produce dramatic symptoms, but over time they add up. Common signs include brittle hair that breaks easily, dry or pale skin, and nails that split or peel. More significant deficiency can trigger rapid hair loss, a condition called telogen effluvium where hair sheds in noticeable clumps.
Your immune system also takes a hit. Protein is essential for making antibodies, the molecules your body uses to neutralize bacteria, viruses, and other threats. Women who frequently get sick, take longer to recover from colds, or notice slow wound healing may be falling short on protein alongside other nutrients.
Can You Eat Too Much Protein?
For healthy women, the updated guideline range of 1.2 to 1.6 g/kg is safe. Going higher, into the 1.6 to 2.2 g/kg range that athletes use, is also generally fine for people with healthy kidneys. But very high protein intakes do create more work for your kidneys by increasing the acids and waste products they need to filter. Over time, this added workload can increase inflammation and oxidative stress throughout the body.
The source of your protein matters here. Animal proteins tend to produce more acids for your kidneys to clear, while plant-based proteins are easier on the system. A mix of both, or a deliberate lean toward plant sources like lentils, beans, tofu, and quinoa, can help you hit high targets without overtaxing your kidneys. If you have any existing kidney issues, even mild ones, high-protein diets deserve a conversation with your care team before you start.
Quick Reference by Body Weight
- 120 lbs (55 kg): 66–88 g/day at 1.2–1.6 g/kg
- 140 lbs (64 kg): 76–102 g/day
- 160 lbs (73 kg): 87–116 g/day
- 180 lbs (82 kg): 98–131 g/day
- 200 lbs (91 kg): 109–145 g/day
These ranges apply to the general updated guidelines. If you’re very active, pregnant, breastfeeding, or over 50, adjust upward using the more specific targets outlined above.