How much protein do women over 40 need?

Current evidence suggests 1.6–2.2g of protein per kilogram of bodyweight daily for women over 40 who are active or doing resistance training. This is significantly higher than the outdated RDA of 0.8g/kg, which was never designed to support muscle maintenance in ageing women. A 65kg woman should aim for around 104–143g of protein daily.

Why do women lose muscle faster after 40?

Two mechanisms accelerate muscle loss after 40: anabolic resistance (muscle cells become less responsive to protein signals, requiring more protein to achieve the same muscle protein synthesis response) and the decline of oestrogen, which plays a direct role in muscle protein synthesis. This combination means both training stimulus and protein intake need to increase significantly to maintain muscle mass.

What is the best protein powder for women over 40?

Whey protein isolate has the highest leucine content and the most robust evidence for muscle protein synthesis — leucine is the key trigger for muscle building. For women who don't consume dairy, a blended plant protein (combining pea and rice protein) provides a complete amino acid profile. Aim for a product with at least 2–3g of leucine per serving, minimal fillers, and third-party testing for quality.

Protein for Women Over 40 — How Much You Need and How to Get It

Sarah at VelaOra

Women's Health Scientist & Navigator

I buy my friends protein bars. Not as a statement about their diet — as a gift, because finding ones that actually taste good is genuinely difficult and I've done the research so they don't have to. The Nothing Naughty pineapple bar tastes like a pineapple lump. I'm not exaggerating. When I find something that good and that clean, I tell everyone. That's the spirit in which I've written this article.

Protein has a marketing problem almost as bad as creatine's. Walk into any sports supplement shop and you're confronted by a wall of product designed for 25-year-old male athletes, in tubs the size of small children, with flavours called things like "Birthday Cake Explosion." The result is that most women — particularly women over 40 who need protein more than they ever have — assume it's not for them and carry on quietly undernourished.

Let me fix that.

Why Women Over 40 Need More Protein Than They Think

Most NZ women eat significantly less protein than research suggests is optimal — particularly in the perimenopausal and menopausal years when protein's role becomes more critical, not less.

Muscle preservation. As oestrogen declines, muscle mass decreases faster. Muscle is not just aesthetic — it drives your metabolism, protects your bones, reduces fall risk, and supports longevity. Protein is the raw material for building and maintaining muscle. Without enough of it, no amount of resistance training delivers its full benefit.

Bone health. Protein makes up roughly a third of bone mass. Adequate intake supports bone density at exactly the time in life when it begins to accelerate its decline.

Satiety and blood sugar. Protein is the macronutrient with the highest satiety effect — it keeps you full significantly longer than carbohydrate or fat. For women managing weight changes in perimenopause, adequate protein is a practical tool that requires no calorie counting.

Hormonal health. Your body makes hormones, neurotransmitters, and enzymes from amino acids — the building blocks of protein. Low protein intake means reduced raw materials for the biochemical processes that regulate mood, sleep, and energy. Oestrogen itself is not a protein, but the enzymes that metabolise and recirculate it are.

How Much Do You Actually Need?

The standard recommendation of 0.8g per kg of body weight is the minimum to prevent deficiency — not the amount for optimal health in a perimenopausal woman. Current evidence supports 1.2–1.6g per kg of body weight for women over 40 who are physically active. For a 65kg woman that's roughly 78–104g of protein per day. Most women eating a standard NZ diet are reaching about half that.

Aim for 25–35g of protein per meal across three meals. This is both more achievable and more effective than attempting to hit a daily total in one sitting — protein synthesis is more efficient when spread across the day.