How Much Protein Do Women Need After 40?

If you've heard that you should be eating more protein as you get older, you've heard right. Protein needs don't stay fixed across your lifetime—and for women, the years after 40 are exactly when getting enough starts to matter more. Here's what the science actually says, and what it means for your plate.

The "Official" Number Is Probably Too Low for You

The Recommended Dietary Allowance (RDA) for protein is 0.8 grams per kilogram of body weight per day for all adults over 18.[1] For a 150-pound (68 kg) woman, that's about 54 grams a day.

But here's the catch: the RDA was set as the minimum needed to prevent deficiency in the average healthy adult—not the amount that helps you thrive as you age.[1][2] A growing body of research suggests this number is too low for older adults, and specifically for women in midlife and beyond.[2][3]

One careful study using modern measurement techniques found that women over 65 actually need about 1.0 to 1.3 grams per kilogram per day—well above the current RDA.[3]

What the Experts Recommend for Women Over 50

For women in the menopausal transition and beyond, most expert groups now recommend aiming higher than the RDA:

- The European Society for Clinical and Economic Aspects of Osteoporosis and Osteoarthritis (ESCEO) recommends 1.0 to 1.2 grams per kilogram per day for postmenopausal women, with at least 20 to 25 grams of high-quality protein at each main meal.[4]

- International expert groups (PROT-AGE) recommend 1.0 to 1.2 grams per kilogram per day for adults over 65, and 1.2 to 1.5 grams per kilogram per day for those coping with illness or recovery.[5]

- For a 150-pound (68 kg) woman, 1.2 g/kg works out to roughly 80 grams of protein a day.

Recent research in postmenopausal women goes even further: an analysis of the Women's Health Initiative estimated that intakes of at least 1.2 g/kg/day—and possibly up to 1.5 g/kg/day—were linked to more favorable body composition, including less abdominal and visceral fat and more lean tissue, over three years.[6]

Why Protein Matters More After 40

Two big changes make protein more important in midlife:

- Muscle loss (sarcopenia). Starting around age 50, women lose muscle mass and strength at an accelerating rate, which raises the risk of falls, frailty, and disability. Protein and physical activity are the two main stimuli that build and preserve muscle.[4][2]

- Bone loss (osteoporosis). The drop in estrogen at menopause speeds up bone loss. Adequate protein—alongside calcium and vitamin D—is an important contributor to maintaining bone strength and reducing fracture risk.[4][7]

Your body also becomes less efficient at turning dietary protein into muscle as you age (a phenomenon called "anabolic resistance"). That's a key reason older adults need more protein than younger ones to get the same muscle-building effect.[8]

It's Not Just How Much—It's How You Spread It Out

Eating all your protein at dinner isn't the best strategy. Muscle responds best when protein is distributed across the day, with a meaningful dose at each meal.[4][8]

A practical target is 20 to 30 grams of high-quality protein at each of your three main meals, rather than a small breakfast and a protein-heavy dinner.[4] The amino acid leucine—found in animal proteins like dairy, eggs, meat, and fish, as well as soy—plays a special role in triggering muscle building.[8][9]

Protein Works Best With Exercise

Protein and resistance (strength) training are a team. Combining adequate protein intake with regular exercise produces

Written by Maira Luettinger, DNP, AGPCNP-BC
Adult-Gerontology Primary Care Nurse Practitioner
Founder, MIDVI Health
Madison, Wisconsin

References

1. Guidance on Energy and Macronutrients across the Life Span. Heymsfield SB, Shapses SA. The New England Journal of Medicine. 2024;390(14):1299-1310. doi:10.1056/NEJMra2214275.

2. Perspective: Protein Requirements and Optimal Intakes in Aging: Are We Ready to Recommend More Than the Recommended Daily Allowance?. Traylor DA, Gorissen SHM, Phillips SM. Advances in Nutrition (Bethesda, Md.). 2018;9(3):171-182. doi:10.1093/advances/nmy003.

3. Dietary Protein Requirement of Female Adults >65 Years Determined by the Indicator Amino Acid Oxidation Technique Is Higher Than Current Recommendations. Rafii M, Chapman K, Owens J, et al. The Journal of Nutrition. 2015;145(1):18-24. doi:10.3945/jn.114.197517.

4. The Role of Dietary Protein and Vitamin D in Maintaining Musculoskeletal Health in Postmenopausal Women: A Consensus Statement From the European Society for Clinical and Economic Aspects of Osteoporosis and Osteoarthritis (ESCEO). Rizzoli R, Stevenson JC, Bauer JM, et al. Maturitas. 2014;79(1):122-32. doi:10.1016/j.maturitas.2014.07.005.

5. Protein‐enriched soup and weekly exercise improve muscle health: A randomized trial in mid‐to‐old age with inadequate protein intake. Peng LN, Lin MH, Tseng SH, et al. Journal of Cachexia, Sarcopenia and Muscle. 2024;15(4):1348-1357. doi:10.1002/jcsm.13481.

6. Estimating the Effect of Hypothetical Dietary Protein Interventions on Changes in Body Composition of Postmenopausal Women Over 3 Years Using Data From the Women's Health Initiative (WHI) Study: An Emulated Target Trial. Li J, Jiang L, Saquib N, et al. International Journal of Obesity (2005). 2026;50(3):609-617. doi:10.1038/s41366-025-01978-0.

7. Nutrients to Mitigate Osteosarcopenia: The Role of Protein, Vitamin D and Calcium. Kirk B, Prokopidis K, Duque G. Current Opinion in Clinical Nutrition and Metabolic Care. 2021;24(1):25-32. doi:10.1097/MCO.0000000000000711.

8. Nutrition Strategies to Counteract Sarcopenia: A Focus on Protein, LC N-3 PUFA and Precision Nutrition. Murphy CH, McCarthy SN, Roche HM. The Proceedings of the Nutrition Society. 2023;82(3):419-431. doi:10.1017/S0029665123003555.

9. Protein intake and risk of frailty among older women in the Nurses' Health Study. Struijk EA, Fung TT, Rodríguez-Artalejo F, et al. Journal of Cachexia, Sarcopenia and Muscle. 2022;13(3):1752-1761. doi:10.1002/jcsm.12972.