The number most women have in their heads — 50 to 60 grams of protein per day — comes from a recommendation designed to prevent deficiency, not to support muscle maintenance, bone health, or body composition in a postmenopausal woman who is also training. Those are different goals, and they require a different number.
Where the Standard Recommendation Comes From
The RDA of 0.8 grams of protein per kilogram of body weight per day was established based on nitrogen balance studies — measuring the minimum intake needed to avoid net protein loss in the body. It was never intended as an optimal intake for older adults trying to preserve muscle or support active adaptation to training.
For a 150-pound (68 kg) woman, 0.8 g/kg produces a target of about 54 grams per day. That’s enough to stay out of clinical deficiency. It is not enough to maintain muscle mass after 50 if you’re also dealing with the effects of reduced estrogen, slower recovery, and the natural blunting of the muscle-building response to protein that comes with age.
What the Evidence Supports
The current research on protein requirements for older adults — synthesized in several major position statements from sports nutrition and gerontology organizations — supports a target of 1.2 to 1.6 grams per kilogram of body weight per day for women over 50 who are physically active.
Running the same 150-pound example: that’s 82 to 109 grams per day. A meaningful difference from 54.
For women in a caloric deficit — actively trying to lose weight — the recommendation moves toward the higher end of that range, or even slightly above it. Muscle loss accelerates under caloric restriction, and higher protein intake is one of the most reliable tools for limiting that loss.
The Per-Meal Question
Daily total matters. Per-meal distribution matters separately. Due to anabolic resistance — the blunted muscle protein synthesis response that comes with age — the research suggests 30 to 40 grams of protein per meal as a more effective target than the 20 to 25 grams that was considered adequate at a younger age.
This has practical implications for meal planning. A breakfast of yogurt and fruit, a lunch salad with a few ounces of chicken, and a dinner with a palm-sized piece of fish adds up to a daily total that might look reasonable but delivers each meal well below the threshold for maximally stimulating muscle protein synthesis.
A Simple Starting Point
Calculate your target range: multiply your body weight in pounds by 0.55 for the lower bound and 0.73 for the upper bound. Those are your daily gram targets.
Then check what you’re actually eating. Three days of honest tracking — everything, including the small amounts that add up — usually reveals where the gaps are. For most women, breakfast is the largest gap. Getting to 30 to 35 grams of protein at the first meal of the day is the highest-leverage change most people can make.
→ Protein After 50: What Women Need to Know
→ The Best Protein Sources for Women Over 50
– Stephen Holt, CSCS
29 Again Custom Fitness | Timonium, MD
Nerd Note: The RDA of 0.8 g/kg/day is a minimum to prevent deficiency, not an optimal target for older adults. Evidence consistently supports 1.2–1.6 g/kg/day for muscle maintenance in active adults over 50, with higher intakes during caloric restriction. Bauer J et al., JAMDA (2013); Stokes T et al., Nutrients (2018); Phillips SM et al., American Journal of Clinical Nutrition (2016).
