Nutrition
Eating more protein than the official guideline supports better muscle and bone after menopause
The official protein guideline — 0.8g per kilogram of body weight a day — was set decades ago from studies that barely included older women. A new analysis suggests it may be too low for the postmenopausal years.
Researchers used data from 3,789 postmenopausal women aged 50–79 in the Women's Health Initiative to model what would happen over 3 years at different protein intakes: the current RDA of 0.8g/kg/day, and higher targets of 1.0, 1.2 and 1.5g/kg/day. Body composition was tracked with DXA scans, the same imaging used to measure bone density and lean versus fat mass.
Women who sustained protein intake above the RDA — particularly at or above 1.2g/kg/day — showed more favourable changes in lean mass and bone measures than those who stuck close to the minimum guideline. For a 65kg woman, that's roughly 78g of protein a day rather than 52g, spread across meals rather than loaded into one.
This matters because postmenopausal women lose muscle and bone density faster once oestrogen drops, and both are strongly linked to frailty, fracture risk and metabolic health later in life. The RDA was never designed as a target for healthy ageing — it's the minimum to avoid deficiency, calculated mostly from younger adults.
This was an observational emulated-trial analysis, not a randomised controlled trial, so it shows association rather than definitive proof of cause. But it adds to a growing body of evidence that higher protein — alongside resistance exercise — is one of the more actionable levers for preserving muscle and bone through the menopause transition.
What the research says
An emulated target-trial analysis of 3,789 postmenopausal women aged 50–79 in the Women's Health Initiative study used DXA-measured body composition to compare hypothetical adherence to four protein intake levels (≥0.8, ≥1.0, ≥1.2 and ≥1.5g/kg/day) over 3 years. Higher sustained intake was associated with more favourable lean mass and bone outcomes than intake at the current RDA.
International Journal of Obesity (Nature) · Women's Health Initiative analysis, 2026 ↗Frequently asked questions
How much protein should I actually eat after menopause?
The official RDA of 0.8g per kg of body weight a day is a minimum, not an optimum. A 2026 Women's Health Initiative analysis found postmenopausal women sustaining around 1.2g/kg/day or more had better bone and lean-mass outcomes over 3 years. For a 65kg woman, that's roughly 78g of protein daily, spread across meals.
Is it too late to start eating more protein if I'm already postmenopausal?
No — the analysis followed women already postmenopausal, aged 50–79, and still found benefit from higher intake over just 3 years. Combining higher protein with resistance exercise is the combination most consistently linked to preserving muscle and bone at this life stage.
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